This work was supported by Major Program of the National Natural Science Foundation of China (62036001).

The protocol used for this study was approved by the Institutional Review Board of Tsinghua University.
1. Stimuli construction and presentation
<ol>
	<li>Stimuli construction
	<ol>
		<li>Stimuli preparation: Prepare target words containing approximately 140 Chinese two-character compounds, of which low- and high-frequency words account for half. Precede each target by three analogues: a phonologically identical word (homonymous word), a word with related meaning, and an irrelevant control word.
		<ol>
			<li>Ensure that high-frequency targets are always preceded by high-frequency antecedents and low-frequency targets are always preceded by low-frequency precedents, whether in related conditions or unrelated control groups. In addition, ensure the precede-target pairs are similar in the number of strokes and frequency. 
			NOTE: All the words for this study were selected from the Modern Chinese Frequency Dictionary (Xiandai Hanyu Pinlu Cidian). The frequency of low-frequency words was less than eight times per million, and the frequency of high-frequency words exceeded 800 times per million.</li>
		</ol>
		</li>
		<li>Stimuli assessment: Recruit a separate group of approximately 30 students to evaluate the degree of semantic relevance between word pairs on a seven-point scale, wherein 1 reflects the lowest correlation and 7 reflects the highest correlation.</li>
		<li>Final stimulus determination: Delete inappropriate word pairs, such as word pairs with lower scores in semantically related conditions and word pairs with higher scores in homophone and irrelevant condition scores.
		<ol>
			<li>Calculate the respective average scores of high- and low-frequency semantic-related word pairs and ensure no significant difference is present between the two.</li>
			<li>In addition, ensure that the scores of homophone pairs and unrelated pairs are not significantly different at both high and low frequency. Finally, determine the final experimental stimulus material (see Table Materials). 
			&#8203;NOTE: For the semantic-related values of the semantic-related pairs in this experiment, the final average values were 5.62 and 5.73 for high-frequency and low-frequency pairs, respectively, and there was no significant difference between the two (p &#62; .1). In addition, the semantic relatedness between the homophonic and unrelated pairs was not significantly different (p &#62; .1).</li>
		</ol>
		</li>
	</ol>
	</li>
	<li>Stimuli presentation
	<ol>
		<li>Build a program to show the task to the subjects and fill in the aforementioned materials (the program can be written in E-prime or other programming languages).</li>
		<li>Ensure that each core structure of the program starts with a screen displaying a &#34; + &#34; sign that lasts for 300 ms, directly after which the preceding word must appear for 140 ms, with no interval between the two.</li>
		<li>After that, set a blank screen lasting for 360 ms, and then set the target word, which will appear for 500 ms. Finally, set a question mark (?) that will continue to be displayed until the participant has decided on the word pair just shown and pressed the button as quickly and accurately as possible.</li>
		<li>Tell the participants in advance that they need to judge whether the word pair is semantically related in the semantic judgment task and whether the phonology is the same in the phonological judgment task.</li>
		<li>Practice session setup: Set up two practice groups to include semantic judgment and phonological judgment tasks, respectively, with no less than 10-word pairs for each task. Inform the participants that they can repeat the exercises to ensure that the accuracy in the practice session is more than 70%.</li>
		<li>Formal experiment setup: Divide the whole experiment into 6 blocks, with the semantic judgment task and the phonological judgment task each accounting for half.
		<ol>
			<li>Make sure that there are no repeated target words in each block, and that the number of priming types in each block is the same. In addition, set up a few filler trials to reduce the response deviation caused by the unequal number of tests requiring positive or negative reactions.</li>
			<li>Randomize the order of items in each block and counterbalance the block order among the subjects. 
			&#8203;NOTE: The entire experiment can also be divided into eight or ten or more blocks according to the number of experimental materials to be prepared, which minimizes the repetition of target words in each block.</li>
		</ol>
		</li>
	</ol>
	</li>
</ol>
2. Experiment preparation and electrophysiological recording
<ol>
	<li>Recruit right-handed native Chinese speakers with a normal vision that may have been previously corrected.
	<ol>
		<li>Exclude participants with any neurological or psychiatric diseases.</li>
		<li>Ensure there is a balanced number of female and male participants in the desired age range (18-28 years old).</li>
		<li>Ensure that the participants do not have any history of perming or dyeing their hair for the past two months.</li>
		<li>Inform the participants that they will need to have sufficient sleep and rest time before the experiment25.</li>
		<li>When participating in the experiment, please make sure the participants are in a healthy state at the time of conducting the experiment.</li>
	</ol>
	</li>
	<li>When a participant arrives at the lab, introduce the experimental equipment, tasks, and time costs. Explain the requirements (such as not being sleepy, moving, and blinking) to help them understand the entire process and eliminate unnecessary worries.</li>
	<li>If the participant has no other questions about the experiment, ask them to fill in the Edinburgh Handedness Query Form, which is used to confirm that all participants have the same right-handed habits.</li>
	<li>Provide the informed consent form to the participants and ask them to read and sign carefully. If participants have questions about the content of the consent form, provide them with the necessary explanations.</li>
	<li>Instruct the participant to properly clean their scalp and dry their hair in the laboratory. While waiting for participants, please prepare all experimental materials. 
	NOTE: The electroencephalogram (EEG) signal is amplified using an amplifier system with a bandpass of 0.01 to 100 Hz and continuously sample at 500 Hz.</li>
	<li>Invite the participants to sit comfortably on a chair in the chamber where the experiment will be conducted. Instructed them not to move the chair.</li>
	<li>Use cotton swabs and facial scrubs to clean the skin under the participant&#39;s left eye (for the vertical electro-oculographic electrode), near the outer canthus of the right eye (for the horizontal electro-oculographic), and around the right and left mastoid bones (for Tp9 and Tp10, which will be used as new offline references). 
	NOTE: The distribution of electrodes may vary depending on the caps used.</li>
	<li>Place the elastic cap on the participant&#39;s head and make sure that the Cz electrode is at the center of the top of the head. Fix the electrode cap strap under the chin with care to ensure that it is not too tight or too loose.</li>
	<li>Make sure that the cap and amplifier are connected to the recording system. Next, switch the recording software to the impedance monitoring interface.</li>
	<li>Ensure that the impedance of all electrodes does not exceed 5 k&#937; or 10 k&#937;, starting with the reference (Ref) and ground (Gnd) electrodes.</li>
	<li>Pass the syringe filled with conductive gel through the small hole of an electrode to the scalp and then push the plunger to inject a small amount of conductive gel into the scalp while being careful not to cause an overflow. At the same time, monitor the display system that displays the impedance in real-time until the impedance drops to the threshold.</li>
	<li>After the Ref and Gnd electrodes are prepared, reduce the impedance of the other electrodes in the same way. Treat the impedance reduction of ocular electricity carefully.
	<ol>
		<li>Tape the small holes on one side of the two electro-oculographic electrodes to prevent the injected conductive gel from leaking. Fix them to the bottom of the left eye and the outer canthus of the right eye with tape.</li>
	</ol>
	</li>
	<li>After all the electrodes are prepared, instruct the participants to be ready for the experiment. Instruct the participants to relax and avoid excessive eye blinking and body movement during the experiment.</li>
	<li>Present the stimulus via the stimulus demonstration program and let the participants practice in the practice section. 
	NOTE: After the practice session, participants can ask questions if they have any doubts or questions about how to proceed.</li>
	<li>Start the formal experiment and record the EEG information. Monitor the recording system during recording. If an electrode is loose or the resistance exceeds the threshold, refill the electrode when the participant is resting. 
	NOTE: Participants can rest for 4-10 min after each block.</li>
	<li>After the experiment is completed, save the EEG signal and turn off the equipment, such as the recording system and amplifier. Then take off the participant&#39;s cap and instruct the participant to wash off the conductive gel from the hair and skin. Finally, reward the participants and thank them for their cooperation.</li>
</ol>
3. EEG preprocessing
<ol>
	<li>Utilize semi-automatic ocular correction with independent component analysis.</li>
	<li>Compute the ERPs from 100 ms to 600 ms after the onset of the target word (100 ms pre-target baseline).</li>
	<li>Set the EEG bandpass-filtered offline from 0.05 to 30 Hz (zero phase shift mode, 24 dB/oct).</li>
	<li>Discard epochs exceeding &#177;80 &#181;V by artifact rejection and eliminate the trials of erroneous responses.</li>
</ol>

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</ol>

There are no competing financial interests.

Experimental results and significance: 
The purpose of this protocol was to infer the following: 1) whether the word recognition model is a feedforward model or an interactive model and 2) the interaction between the phonological and semantic patterns in Chinese two-character compound recognition of high and low frequency under different tasks. An interference paradigm of phonological and semantic matching task using the ERP technique was adopted. The ERP responses preceded by homophones and unrelat...

The critical issue in any word recognition model is understanding the role of phonology in the process of semantic access1. For alphabetic languages, many studies consistently view phonology as playing an important role in semantic access, including English2,3,4, Hebrew5, French6, and Spanish7. In other words, written word recognition involves not only orthographic but also phonological and semantic processing. This observation in the interactive connectionist model is explained by extensions activated throughout the network, where orthography is associated with phonological and semantic representations through weighted connections8. This proliferation of activation provides the core mechanism for the visual word recognition model, which assumes that phonological and semantic representations are automatically activated in response to orthographic input9.
However, current empirical evidence supporting the hypothesis of interactive automation remains controversial. Some studies claim that the activation of phonological and semantic representations can be adjusted or prevented by task demands or attention, which implies a certain top-down influence on the high-level processes involved in word perception10,11. However, the aforementioned description has been questioned by many findings that report phonological and semantic effects in visual word recognition even though these representations are completely irrelevant to the task or cannot be directly accessed12, thereby supporting the view that semantics and phonology may be accessed automatically and forcibly during the reading process13. Therefore, there is uncertainty on whether the phonological and semantic activation in visual word recognition depends on the specific task or whether it occurs forcibly and automatically in a task-independent manner.
The answer to aforementioned question is difficult for Chinese readers. Compared to English, Chinese is a logographic script whose characters represent morphemes instead of phonemes14. At present, the role of phonology for semantic access to Chinese words remains controversial. Some studies have claimed that phonology plays an important role in semantic access to Chinese words15,16,17. Others, however, have held the opposite view18,19. After evaluating the aforementioned research for Chinese phonological processing, we found that the experimental paradigm and specific research methods differ. On the whole, it was mainly divided into two paradigms: word priming15,18,19 and violation paradigm in the sentence17,20,21. The target word is usually embedded at the end of the sentence in the violation paradigm22. In terms of language mechanism, a short two-word phrase is a more manageable unit than a complete sentence that is difficult to process23. In addition, variables that are difficult to control in a sentence, such as syntax, context, or other factors, may lead to different conclusions24. The word priming paradigm is a method commonly used to explore word recognition models, whether in alphabetic languages or Chinese. The task of this paradigm is to judge whether the target word preceded by the primes is a real word or pseudoword; that is, this paradigm usually contains only one lexical task. However, a single lexical decision task may not be the best choice to solve the problem of whether the activation of phonology and semantics depends on the task. Therefore, two different tasks may be more suitable for exploring this question.
Therefore, this research aimed to explore the role of phonology in Chinese word recognition and simultaneously attempt to determine whether the activation of phonology and semantics is in task independent. Our research includes two tasks using the interference paradigm: semantic judgment and phonological judgment. To the best of our knowledge, this is the first event-related potential (ERP) study of Chinese two-character compound recognition using this interference paradigm, and this method rarely appears in studies of alphabetic languages. Specifically, in the semantic judgment task, participants must judge whether the target word and its precedent are semantically related, while in the phonological task, they must judge whether the paired words have the same pronunciation.
The former is a semantic matching task that does not require a priori phonological processing, and the latter is a phonological judgment task that does not require a priori semantic processing. Therefore, we compared homophone pairs and unrelated control groups in the semantic judgment task to reveal whether and how phonology affects semantic processing. Similarly, we compared semantically related word pairs with unrelated control conditions in the phonological judgment task to reveal whether and how semantics affect phonological processing. In addition, the aforementioned problem was verified in high- and low-frequency words. Thus, this complementary semantic and phonological judgment task can not only reveal the importance of phonological processing in Chinese word recognition but also reveal whether and how phonology and semantics interact.
If the phonology and semantic processes are early, automatic, and interactive, the effect of phonological and semantic activation should be observed in the response time of the two tasks. For ERP, phonological and semantic processes trigger two different electrophysiological markers2,7. In addition, their time courses and their spatial distributions should be different. An early positive component (P200) should reflect phonological processing, and the typical semantic processing marker N400 should also be identified20,21. We assumed that both the phonologically related pairs in the semantic task and the semantic-related pairs in the phonological task would cause a significant decrease in N400, which would have indicated that phonological processing may lead to some degree of activation at lexical-semantic levels. In addition, we monitored whether the P200, which characterizes phonological processing, appeared in the semantic judgment task or the phonological judgment task. In the phonological judgment task, semantic-related conditions trigger the P200, which can be seen as evidence of the early influence of semantics on phonological processing.

<table><tbody><tr><td>BrainAmp DC amplifier system (Brain Products GmbH)</td><td>Brain Products, Gilching, Germany</td><td></td><td>BrainAmp S/N AMP13061964DC Input 5.6DC=150mA Operation 7mA Standby</td></tr><tr><td>Easycap (Brain Products GmbH)</td><td>Brain Products, Gilching, Germany</td><td></td><td>62 Ag/AgCl electrodes with a configuration of the international 10&amp;ndash;20 system of electrode</td></tr></tbody></table>

interaction between phonological and semantic processes in visual word recognition using electrophysiology

Controversies have always existed in research related to reading abilities; on whether printed words are perceived in a feedforward manner based on orthographic information after which, other representations, such as phonology and semantics are activated, or whether these are fully interactive and high-level semantic information affects early processing. An interference paradigm was implemented in the presented protocol of phonological and semantic judgment tasks that utilized the same precede-target pairs to explore the relative order of phonological and semantic activation. The high- and low-frequency target words were preceded with three conditions: semantically related, phonological-related (homophones), or unrelated. The results showed that the induced P200 component of low-frequency word pairs was significantly greater than high-frequency words in both the semantic and phonological tasks. In addition, both the homophones in the semantic task and the semantically related pairs in the phonological task caused reduction in N400 when compared to the the control condition, word frequency-independently. It is worth noting that for the low-frequency pairs in the phonological judgment task, the P200 released by the semantically related word pairs was significantly larger than that in the control condition. Overall, semantic processing in phonological tasks and phonological processing in semantic tasks were found in both high- and low-frequency words, suggesting that the interaction between semantics and phonology may operate in a task-independent manner. However, the specific time this interaction occurred may have been affected by the task and frequency.

This protocol was used in a recent study to investigate the role of phonology in Chinese two-character compound recognition and to infer the word recognition model26. All stimuli used in this study were fully disclosed26. Three time windows were selected on the basis of global field power (GFP): at 100-150 ms, 160-280 ms, and 300- 500 ms for N1, P200, and N400 components, respectively26. The average amplitudes of the above two time windows were analy...

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Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology

We present a protocol to explore the relative activation sequence of phonology and semantics in visual word recognition. The results show that consistent with interactive accounts, semantic and phonological representations may be processed interactively, and higher-level linguistic representations may affect early processing.

Controversies have always existed in research related to reading abilities; on whether printed words are perceived in a feedforward manner based on ...

interaction-between-phonological-semantic-processes-visual-word

Research

JoVE Journal

Behavior

2.3K Views.  Tsinghua University. Dit protocol kan helpen bij het observeren van de specifieke interactie tussen fonologische en semantische patronen in Chinese twee karakters samengestelde herkenning, en afleiden of de woordherkenning een feedforward of een interactief model is. Het belangrijkste voordeel is de aanwezigheid van twee verschillende taken van het interferentieparadigma, wat meer bevorderlijk is voor het onderzoeken of de interactie tussen fonologie en semantiek taakonafhankelijk is en hoe te interageren onder v...

Video: Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology

Investigating the Effects of Antipsychotics and Schizotypy on the N400 Using Event-Related Potentials and Semantic Categorization

Within the field of cognitive neuroscience, functional magnetic resonance imaging (fMRI) is a popular method of visualizing brain function. This is in part because of its excellent spatial resolution, which allows researchers to identify brain areas associated with specific cognitive processes. However, in the quest to localize brain functions, it is relevant to note that many cognitive, sensory, and motor processes have temporal distinctions that are imperative to capture, an aspect that is left unfulfilled by fMRI&#8217;s suboptimal temporal resolution. To better understand cognitive processes, it is thus advantageous to utilize event-related potential (ERP) recording as a method of gathering information about the brain. Some of its advantages include its fantastic temporal resolution, which gives researchers the ability to follow the activity of the brain down to the millisecond. It also directly indexes both excitatory and inhibitory post-synaptic potentials by which most brain computations are performed. This sits in contrast to fMRI, which captures an index of metabolic activity. Further, the non-invasive ERP method does not require a contrast condition: raw ERPs can be examined for just one experimental condition, a distinction from fMRI where control conditions must be subtracted from the experimental condition, leading to uncertainty in associating observations with experimental or contrast conditions. While it is limited by its poor spatial and subcortical activity resolution, ERP recordings&#8217; utility, relative cost-effectiveness, and associated advantages offer strong rationale for its use in cognitive neuroscience to track rapid temporal changes in neural activity. In an effort to foster increase in its use as a research imaging method, and to ensure proper and accurate data collection, the present article will outline &#8211; in the framework of a paradigm using semantic categorization to examine the effects of antipsychotics and schizotypy on the N400 &#8211; the procedure and key aspects associated with ERP data acquisition.

Using event-related EEG potentials (ERPs), we investigate the effects of antipsychotic medications on abnormal semantic brain activations in healthy individuals with schizotypal traits. We use ERPs to track distinct changes in brain activity, shedding insight into the cognitive processes associated with semantic categorization.

Within the field of cognitive neuroscience, functional magnetic resonance imaging (fMRI) is a popular method of visualizing brain function. This is in ...

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control

Attention control is the ability to selectively attend to some sensory signals while ignoring others. This ability is thought to involve two processes: enhancement of sensory signals that are to be attended and the attenuation of sensory signals that are to be ignored. The overall strength of attentional modulation is often measured by comparing the amplitude of a sensory neural response to an external input when attended versus when ignored. This method is robust for detecting attentional modulation, but precludes the ability to assess the separate dynamics of attending and ignoring processes. Here, we describe methodology to measure independently the neurophysiological signals of attending and ignoring using the intermodal attention task (IMAT). This task, when combined with electroencephalography, isolates neurophysiological sensory responses in auditory and visual modalities, when either attending or ignoring, with respect to a passive control. As a result, independent dynamics of attending and of a ignoring can be assessed in either modality. Our results using this task indicate that the timing and cortical sources of attending and ignoring effects differ, as do their contributions to the attention modulation effect, pointing to unique neural trajectories and demonstrating sample utility of measuring them separately.

Attention control comprises enhancement of target signals and attenuation of distractor signals. We describe an approach to measure separately but concurrently, the neurophysiology of attending and ignoring in sustained intermodal attention, utilizing a passive control condition during which neither process is continuously engaged.

Attention control is the ability to selectively attend to some sensory signals while ignoring others. This ability is thought to involve two processes: ...

Combined Shuttle-Box Training with Electrophysiological Cortex Recording and Stimulation as a Tool to Study Perception and Learning

Shuttle-box avoidance learning is a well-established method in behavioral neuroscience and experimental setups were traditionally custom-made; the necessary equipment is now available by several commercial companies. This protocol provides a detailed description of a two-way shuttle-box avoidance learning paradigm in rodents (here Mongolian gerbils; Meriones unguiculatus) in combination with site-specific electrical intracortical microstimulation (ICMS) and simultaneous chronical electrophysiological in vivo recordings. The detailed protocol is applicable to study multiple aspects of learning behavior and perception in different rodent species.
Site-specific ICMS of auditory cortical circuits as conditioned stimuli here is used as a tool to test the perceptual relevance of specific afferent, efferent and intracortical connections. Distinct activation patterns can be evoked by using different stimulation electrode arrays for local, layer-dependent ICMS or distant ICMS sites. Utilizing behavioral signal detection analysis it can be determined which stimulation strategy is most effective for eliciting a behaviorally detectable and salient signal. Further, parallel multichannel-recordings using different electrode designs (surface electrodes, depth electrodes, etc.) allow for investigating neuronal observables over the time course of such learning processes. It will be discussed how changes of the behavioral design can increase the cognitive complexity (e.g. detection, discrimination, reversal learning).

Shuttle-box avoidance learning is well-established in behavioral neuroscience. This protocol describes how shuttle-box learning in rodents can be combined with site-specific electrical intracortical microstimulation (ICMS) and simultaneous chronical in vivo recordings as a tool to study multiple aspects of learning and perception.

Shuttle-box avoidance learning is a well-established method in behavioral neuroscience and experimental setups were traditionally custom-made; the ...

A Semantic Priming Event-related Potential (ERP) Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder

Individuals with autism spectrum disorder (ASD) have characteristic deficits in understanding the meaning of language, or semantic processing. However, some evidence indicates that semantic processing of non-linguistic stimuli is intact, suggesting that semantic deficits may be language-specific. To appropriately characterize semantic processing deficits in individuals with ASD, comparison of within-modality linguistic (e.g., written words) and non-linguistic (e.g., pictures) stimuli is required. This paper describes such a methodology that makes use of a semantic priming paradigm during concurrent recording of electroencephalographic (EEG) data. EEG provides a dynamic measure of brain activity that is well-suited to characterize subtle differences in semantic processing that may not be observable at the behavioral level. The semantic priming paradigm presents a prime picture or word (e.g., dog) followed by a target picture or word that is either related (e.g., cat) or unrelated (e.g., pencil) to the prime. This paradigm can thus be used to evaluate semantic processing across different modalities, and to compare lexico-semantic and visuo-semantic processing abilities in individuals with ASD and how they might differ from TD individuals. The specific steps involved in creating the stimuli, performing the EEG testing, and analyzing the EEG data are discussed. Representative results illustrate how the N400 component of the event-related potential (ERP) is reduced following semantically-related prime-target pairs compared to unrelated pairs. Comparisons of the N400 between conditions, modalities, and groups can provide estimates of the success of semantic processing, and can thereby be used to characterize semantic deficits in individuals with ASD or other clinical populations.

A Semantic Priming Event-related Potential ERP Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder

This paper describes a semantic priming ERP task using within-modality pairs of pictures and words to investigate semantic processing in individuals with autism spectrum disorder (ASD).

Individuals with autism spectrum disorder (ASD) have characteristic deficits in understanding the meaning of language, or semantic processing. However, ...

Transcranial Direct Current Stimulation (tDCS) of Wernicke's and Broca's Areas in Studies of Language Learning and Word Acquisition

Language is a highly important yet poorly understood function of the human brain. While studies of brain activation patterns during language comprehension are abundant, what is often critically missing is causal evidence of brain areas&#39; involvement in a particular linguistic function, not least due to the unique human nature of this ability and a shortage of neurophysiological tools to study causal relationships in the human brain noninvasively. Recent years have seen a rapid rise in the use of transcranial direct current stimulation (tDCS) of the human brain, an easy, inexpensive and safe noninvasive technique that can modulate the state of the stimulated brain area (putatively by shifting excitation/inhibition thresholds), enabling a study of its particular contribution to specific functions. While mostly focusing on motor control, the use of tDCS is becoming more widespread in both basic and clinical research on higher cognitive functions, language included, but the procedures for its application remain variable. Here, we describe the use of tDCS in a psycholinguistic word-learning experiment. We present the techniques and procedures for application of cathodal and anodal stimulation of core language areas of Broca and Wernicke in the left hemisphere of the human brain, describe the procedures of creating balanced sets of psycholinguistic stimuli, a controlled yet naturalistic learning regime, and a comprehensive set of techniques to assess the learning outcomes and tDCS effects. As an example of tDCS application, we show that cathodal stimulation of Wernicke&#39;s area prior to a learning session can impact word learning efficiency. This impact is both present immediately after learning and, importantly, preserved over longer time after the physical effects of stimulation wear off, suggesting that tDCS can have long-term influence on linguistic storage and representations in the human brain.

Transcranial Direct Current Stimulation tDCS of Wernicke's and Broca's Areas in Studies of Language Learning and Word Acquisition

Here, we describe a protocol for using transcranial direct current stimulation for psycho- and neurolinguistic experiments aimed at studying, in a naturalistic yet fully controlled way, the role of cortical areas of the human brain in word learning, and a comprehensive set of behavioral procedures for assessing the outcomes.

Language is a highly important yet poorly understood function of the human brain. While studies of brain activation patterns during language comprehension ...

Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies

The confounding factors of unexpectedness and semantic integration difficulty naturally residing in anomalous sentences in language studies make it difficult to determine the underlying processing mechanism of ERP components. Unlike the traditional static approach of manipulating expectancy through corpus frequency or cloze probability, this protocol proposes a dynamic method to enhance participants&#39; expectancy for rarely-met anomalous sentences by multiple repetitions while maintaining their semantic integration difficulties. To address the time cost increase resulting from multiple repetitions, this protocol proposes to repeat only the strictly simplified core structure extracted from the anomalous sentence before presenting the semantically enriched, much more informative complete anomalous sentence containing the anomalous core structure to reinitiate the semantic integration processing. The complete anomalous sentence elicited a P600 effect. It suggests that the participants did not give up processing the anomalous information after repetitions and the same semantic integration difficulty was successfully reinitiated. Importantly, the representative experimental results reveal that the greatly attenuated N400 effect caused by multiple repetitions was not recovered by the follow-up reinitiated semantic integration difficulty. It suggests that the attenuated N400 effect should be mainly attributed to the enhancement of expectancy for anomalous information by multiple repetitions. The experimental results show that this method can effectively enhance participants&#39; expectancy for anomalous sentences while retaining the semantic integration difficulty.

We present a protocol to dissociate the intertwining factors of integrative difficulty and unexpectedness in semantically anomalous sentences by applying multiple repetitions to enhance participant&#39;s expectancy for anomalous sentences. The dissociation helps to investigate the major contributor of elicited event-related potentials (ERP) effects such as N400 in language studies.

The confounding factors of unexpectedness and semantic integration difficulty naturally residing in anomalous sentences in language studies make it ...

Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment

Older adults are slower at recognizing visual objects than younger adults. The same is true for recognizing that a letter string is a real word. People with Alzheimer&#39;s disease (AD) or Mild Cognitive Impairment (MCI) demonstrate even longer responses in written word recognition than elderly controls. Despite the general tendency towards slower recognition in aging and neurocognitive disorders, certain characteristics of words influence word recognition speed regardless of age or neuropathology (e.g., a word&#8217;s frequency of use). We present here a protocol for examining the influence of lexical characteristics on word recognition response times in a simple lexical decision experiment administered to younger and older adults and people with MCI or AD. In this experiment, participants are asked to decide as quickly and accurately as possible whether a given letter string is an actual word or not. We also describe mixed-effects models and principal components analysis that can be used to detect the influence of different types of lexical variables or individual characteristics of participants on word recognition speed.

This article describes how to implement a simple lexical decision experiment to assess written word recognition in neurologically healthy participants and in individuals with dementia and cognitive decline. We also provide a detailed description of reaction time analysis using principal components analysis (PCA) and mixed-effects modeling.

Older adults are slower at recognizing visual objects than younger adults. The same is true for recognizing that a letter string is a real word. People ...

Extracting Visual Evoked Potentials from EEG Data Recorded During fMRI-guided Transcranial Magnetic Stimulation

Transcranial Magnetic Stimulation (TMS) is an effective method for establishing a causal link between a cortical area and cognitive/neurophysiological effects. Specifically, by creating a transient interference with the normal activity of a target region and measuring changes in an electrophysiological signal, we can establish a causal link between the stimulated brain area or network and the electrophysiological signal that we record. If target brain areas are functionally defined with prior fMRI scan, TMS could be used to link the fMRI activations with evoked potentials recorded. However, conducting such experiments presents significant technical challenges given the high amplitude artifacts introduced into the EEG signal by the magnetic pulse, and the difficulty to successfully target areas that were functionally defined by fMRI. Here we describe a methodology for combining these three common tools: TMS, EEG, and fMRI. We explain how to guide the stimulator&#39;s coil to the desired target area using anatomical or functional MRI data, how to record EEG during concurrent TMS, how to design an ERP study suitable for EEG-TMS combination and how to extract reliable ERP from the recorded data. We will provide representative results from a previously published study, in which fMRI-guided TMS was used concurrently with EEG to show that the face-selective N1 and the body-selective N1 component of the ERP are associated with distinct neural networks in extrastriate cortex. This method allows us to combine the high spatial resolution of fMRI with the high temporal resolution of TMS and EEG and therefore obtain a comprehensive understanding of the neural basis of various cognitive processes.

This paper describes a method for collecting and analyzing electroencephalography (EEG) data during concurrent transcranial magnetic stimulation (TMS) guided by activations revealed with functional magnetic resonance imaging (fMRI). A method for TMS artifact removal and extraction of event related potentials is described as well as considerations in paradigm design and experimental setup.

Transcranial Magnetic Stimulation (TMS) is an effective method for establishing a causal link between a cortical area and cognitive/neurophysiological ...

Neuroscience

EEG Study on Recognizing Familiar Speakers in Expressive Speech

Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis

Recognizing familiar speakers from vocal streams is a fundamental aspect of human verbal communication. However, it remains unclear how listeners can still discern the speaker's identity in expressive speech. This study develops a memorization-based individual speaker identity recognition approach and an accompanying electroencephalogram (EEG) data analysis pipeline, which monitors how listeners recognize familiar speakers and tell unfamiliar ones apart. EEG data captures online cognitive processes during new versus old speaker distinction based on voice, offering a real-time measure of brain activity, overcoming limits of reaction times and accuracy measurements. The paradigm comprises three steps: listeners establish associations between three voices and their names (training); listeners indicate the name corresponding to a voice from three candidates (checking); listeners distinguish between three old and three new speaker voices in a two-alternative forced-choice task (testing). The speech prosody in testing was either confident or doubtful. EEG data were collected using a 64-channel EEG system, followed by preprocessing and imported into RStudio for ERP and statistical analysis and MATLAB for brain topography. Results showed an enlarged late positive component (LPC) was elicited in the old-talker compared to the new-talker condition in the 400-850 ms window in the Pz and other wider range of electrodes in both prosodies. Yet, the old/new effect was robust in central and posterior electrodes for doubtful prosody perception, whereas the anterior, central, and posterior electrodes are for confident prosody condition. This study proposes that this experiment design can serve as a reference for investigating speaker-specific cue-binding effects in various scenarios (e.g., anaphoric expression) and pathologies in patients like phonagnosia.

Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception

The study introduces a training-testing paradigm to investigate old/new effects of event-related potentials in confident and doubtful prosodic scenarios. Data reveals an enhanced late positive component between 400-850 ms at Pz and other electrodes. This pipeline can explore factors beyond speech prosody and their influence on cue-binding target identification.

Recognizing familiar speakers from vocal streams is a fundamental aspect of human verbal communication. However, it remains unclear how listeners can ...

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

This paper presents a methodology for the recording and analysis of cortical visual evoked potentials (CVEPs) in response to various visual stimuli using 128-channel high-density electroencephalography (EEG). The specific aim of the described stimuli and analyses is to examine whether it is feasible to replicate previously reported CVEP morphological patterns elicited by an apparent motion stimulus, designed to simultaneously stimulate both ventral and dorsal central visual networks, using object and motion stimuli designed to separately stimulate ventral and dorsal visual cortical networks.&#160; Four visual paradigms are presented: 1. Randomized visual objects with consistent temporal presentation. 2. Randomized visual objects with inconsistent temporal presentation (or jitter).&#160; 3. Visual motion via a radial field of coherent central dot motion without jitter.&#160; 4. Visual motion via a radial field of coherent central dot motion with jitter.&#160; These four paradigms are presented in a pseudo-randomized order for each participant.&#160; Jitter is introduced in order to view how possible anticipatory-related effects may affect the morphology of the object-onset and motion-onset CVEP response.&#160; EEG data analyses are described in detail, including steps of data exportation from and importation to signal processing platforms, bad channel identification&#160;and removal, artifact rejection, averaging, and categorization of average CVEP morphological pattern type based upon latency ranges of component peaks. Representative data show that the methodological approach is indeed sensitive in eliciting differential object-onset and motion-onset CVEP morphological patterns and may, therefore, be useful in addressing the larger research aim. Given the high temporal resolution of EEG and the possible application of high-density EEG in source localization analyses, this protocol is ideal for the investigation of distinct CVEP morphological patterns and the underlying neural mechanisms which generate these differential responses.&#160; &#160; &#160;&#160;

In this paper, we present a protocol to investigate differential cortical visual evoked potential morphological patterns through stimulation of ventral and dorsal networks using high-density EEG. Visual object and motion stimulus paradigms, with and without temporal jitter, are described. Visual evoked potential morphological analyses are also outlined.&#160;&#160;

This paper presents a methodology for the recording and analysis of cortical visual evoked potentials (CVEPs) in response to various visual stimuli using ...

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology

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