Contemporary Cognitive Neuroscience: Brain and Mind

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Cognitive psychology is all about how we manipulate representationsLetter-matching task(a) In this version of the task, the subjectresponds “same” when both letters areeither vowels or consonants, and“different” when they are from differentcategories.(b) The reaction time vary for differentconditions.Multiple representations of stimuli1. Physical representation2. Phonetic representation3. Category representation2012/9/18 8
The internal representation of the first letter is transformed during the intervalLetter-matching task(a) An interval (stimulus onset asynchrony)separates the presentation of the twoletters(b) As this interval is lengthened, thedifference in the reaction time to thephysical-identity and phonetic-identityconditions becomes smaller, suggesting atransformation of the representationinto a more abstract code.Chronometric methodologyReaction time is a independent variable.2012/9/18 9
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Page 41: 大腦開竅手冊 Welcome to

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