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Emitted and Evoked P 300 Potentials and Variation in Stimulus Probability
Author(s) -
Ruchkin D. S.,
Sutton S.,
Tueting P.
Publication year - 1975
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1975.tb00052.x
Subject(s) - event related potential , stimulus (psychology) , contingent negative variation , psychology , evoked potential , audiology , amplitude , electrophysiology , neuroscience , electroencephalography , cognitive psychology , physics , optics , medicine
There have been a number of reports of a cerebral potential occurring at about the time of an expected but absent stimulus when absence provided significant information for the subject. This potential consists primarily of a positive peak occurring with a latency of about 300 msec with respect to the time of stimulus absence and is referred to as an emitted P 300 potential. It has been conjectured that the emitted P 300 is a manifestation of the same process that underlies the evoked P 300 . Evidence supporting this hypothesis is provided by demonstrating that both the evoked and emitted P 300 potentials are similarly affected by variation in event probability. A paradigm was used in which click presence and absence provided information. The relative probability of click presence and absence was experimentally manipulated. Both evoked and emitted p 300 amplitude responded in the same way to event probability, larger for the less frequent event and smaller for the more frequent event.