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Auditory Evoked Responses to Unpredictable Stimuli
Author(s) -
Roth Walton T.
Publication year - 1973
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.1469-8986.1973.tb01097.x
Subject(s) - stimulus (psychology) , psychology , audiology , auditory stimuli , perception , cognitive psychology , neuroscience , medicine
The auditory evoked response (AER) to unpredictable stimuli was studied in 18 S s. 100 msec sound bursts consisting of either a pure tone or white noise were presented every sec. One type of stimulus constituted the frequent expected stimulus and the other the infrequent stimulus that occurred as a random substitution. For the low probability (LP) stimulus condition, the mean ratio of infrequent to frequent was 1:30; for the intermediate probability (IP), 1:15; and for the high probability (HP), 1:7.5. S s were instructed to ignore the sounds. The amplitude of a late positive wave (P3) of the AER was largest in the LP and smallest in the HP condition. There was a general decrease of all AER components over the course of a session. No evidence of dishabituation in the AER to the stimuli following the infrequent stimuli was obtained. The results of a detailed analysis of two orbital leads make it unlikely that eye movement or eye blink could account for the results.