The overall goal of the following experiment is to induce psychological stress in a laboratory setting to measure changes in physiological, psychological, or endocrine response after a waiting period and a five minute prestress period. Subjects are required to prepare a speech for a job interview to create anticipatory psychological stress. As a second step, participants are required to deliver their speech in front of an audience, which creates additional stress due to social evaluation.
Next, participants are required to perform a difficult arithmetic task in front of the same audience in order to prolong the experience of social evaluation and introduce novelty and an additional challenging element to the stressor. Results from this protocol show increased psychological stress reactivity, psychological measures of anxiety and stress hormone concentrations based on physiological recordings, psychological inventories, and analysis of saliva samples. Demonstrating the trier social stress test procedure will be Carissa Shelton, Lauren Koeck, and Sabrina Blackledge from my laboratory.
Ideally, two rooms should be available to conduct the TRIO social stress test or TSST. A comfortable waiting room should be available to participants prior to beginning the test and during recovery periods, while a separate interview room should be used during the speech preparation, speech performance, and math portions of the TSST arrange the interview room so that the participant will be facing confederate interviewers and position video or audio recording equipment in the visual field of the participants lab coach should be available for interviewers to wear to increase stress during the TSST. Next, begin the setup of the BioPack MP 36 recording system and plug in the electrodes that will be used to measure heart rate, electrodermal response temperature, and any other physiological responses.
Also, set up the physiological recording software. For this demonstration, we will be using a three liter electrode setup for an electrocardiogram or ECG to measure heart rate during the TSST when the participant arrives, have him or heric comfortably and obtain written informed consent for the experiment. Then collect any demographic information or additional arrival measures that are needed for the experiment.
Also, verify that the subject has not consumed any food or drink other than water in the past hour. Instruct the participant to wait comfortably in the waiting room. This waiting period allows the participant to habituate to the experiment and will help establish true baseline measurements.
Provide the participant with neutral reading material such as magazines containing emotionally neutral content. After the waiting period, administer the state trade anxiety inventory to assess prestress anxiety. This can be done using paper or pencil or online formats.
Next, collect a prestress saliva sample. First, have the participant rinse his or her mouth with water. Then provide a five to 10 centimeter section of drinking straw and a clean disposable two milliliter polypropylene vial.
Instruct the participant to tilt their head forward to allow saliva to pull on the floor of the mouth. Then pass the saliva through the straw into the vial. Approximately 1.5 to two milliliters of saliva should be collected.
Label and store all saliva samples in a minus 20 degrees Celsius freezer as soon as possible. Bring the participant from the waiting room into the interview room at this point. Next, position the ECG electrodes on the participants.
Then record five minutes of prestress physiological measurements. To begin the TSST speech preparation period, read the following script to the participants. This is the speech portion of the task.
You are to mentally prepare a five minute speech describing why you would be a good candidate for your ideal job. Your speech will be videotaped and reviewed by a panel of judges trained in public speaking. You have 10 minutes to prepare and your time begins now.
Set a digital timer for 10 minutes. Then leave the room. Record physiological measurements during the 10 minute period as the subject prepares his or her speech.
After 10 minutes, return to the room wearing lab coats to increase evaluative stress and turn on the prop video camera. Multiple confederates can be used to increase the evaluative stress of the TSST. Next, read the following script to the participant.
This is the speech portion of the task. You are to deliver a speech describing why you would be a good candidate for your ideal job. I will be tending to the monitor, so please direct your attention toward the video camera.
You have been instructed to fill the five minute time period. Your time begins.Now. Record physiological measurements during this five minute speech period.
If the participant stops talking during the speech, allow him or her to remain silent for 20 seconds. If he or she does not resume speaking, prompt the participant to continue by saying you still have time remaining. At the end of the five minute speech period, read the following script to the participant.
During the final five minute math portion of this task, you'll be asked to sequentially subtract the number 13 from 1022. You'll verbally report your answers aloud and be asked to start over from 1022. If a mistake is made, your time begins.Now.
Set a digital timer for five minutes. If the participant makes a mistake, prompt them with That's incorrect. Please start over from 1022.
Record physiological measurements during the five minute period at the end of the math portion of the TSST, collect a post-stress saliva sample. Then administer the post-stress state trait anxiety inventory. To begin the first recovery period, bring the participant to the waiting room and instruct him or her to wait comfortably for 20 minutes.
Provide neutral reading material and set a digital timer for 20 minutes before leaving the room. Return to the room after 20 minutes to collect a recovery one saliva sample. Next, allow for a second recovery period by again telling the participant to wait comfortably for 20 minutes with the provided neutral reading material.
Set a digital timer for 20 minutes and leave the room upon return. Collect a recovery two saliva sample. Then instruct the participant to complete the recovery state trait anxiety inventory.
Finally, debrief the participant as to the true nature of the experiment. Inform the participant that their task performance was not recorded and that no analysis of their participation will be conducted. Explain to the participant that the tasks with which they were presented were unreasonably difficult and do not reflect upon the participant's aptitude or ability.
Also, be sure to thank the participant for taking part in the experiment. To begin analysis of the psychological measures first score each of the collected state trait anxiety and inventories from the prestress post-stress and recovery time points. Next computer mean score for heart rate across each of the prestress speech preparation, speech, performance, and math portions of the TSST.
Alternatively, heart rate can be measured at discrete time points during the periods in which data was recorded. To analyze the neuroendocrine measures, use commercially available enzyme immunoassay kits to assay the SIV samples for hormone concentration. Bring all sali assay kit reagents to room temperature, then follow the kit instructions.
This tri social stress test protocol can induce increases in self-reported anxiety as measured by the state trait anxiety inventory as seen here. Increases can also be seen in heart rate and sali cortisol concentrations if using an intervention that is intended to reduce anxiety and or stress response. Blunted or attenuated increases in these measures are predicted Following this procedure.
Other methods such as behavioral analysis or the measurement of other neuroendocrine measures can be used to further investigate the response to psychological stress. Furthermore, this procedure can be adapted for use with clinical populations.
