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Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better than chance, it is considered subliminal. Studies have shown intriguing effects of subliminal perception. For example, when participants are subliminally exposed to words related to anger, they are more likely to rate other people as hostile. This indicates that subliminal stimuli can influence immediate emotional responses.
However, while people can respond to subliminal perception, this does not necessarily imply that they are easily influenced by subliminal persuasion. Subliminal persuasion involves subthreshold influences on significant decisions, such as voting, product choices, lifestyle changes, and financial investments.
The limited impact of subliminal persuasion can be attributed to the shallow processing of subliminal stimuli. Since these stimuli are processed below the level of conscious awareness, they lack the depth needed to produce meaningful or lasting changes in attitudes or decisions. This means that although subliminal perception can affect momentary judgments or reactions, it is unlikely to have a profound or enduring influence on more substantial life choices.
From Chapter 3:
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