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Effects of UCS Probability on the Contingent Negative Variation and Electrodermal Response During Long ISI Conditioning
Author(s) -
Backs Richard W.,
Grings William W.
Publication year - 1985
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.1469-8986.1985.tb01599.x
Subject(s) - conditioning , psychology , contingent negative variation , audiology , statistics , electroencephalography , mathematics , neuroscience , medicine
Nine subjects participated in a long ISI, trace conditioning paradigm. Tone CSs, at three different frequencies, signaled that a loud noise UCS would occur with either a .17, .50, or .83 probability. Subjects were instructed on the CS‐UCS contingencies. To avoid effects of differential motor preparation, two button presses were required on each trial. Button presses were signaled by lights, one second after the point at which the UCS would occur. EDR was recorded from the nonpreferred hand; EEG was recorded from the C z and P z sites. Only responses to the CSs were quantified. For the EDR, the first interval response was largest at the .83 UCS probability level. The CNV was more negative at the .50 UCS probability level than at the .17 and .83 UCS probability levels across the ISI. An early component of the CNV was also most negative at the .50 UCS probability level, and was larger at C z than at P z . A late CNV component did not differ significantly among UCS probability levels. It was concluded that the EDR and CNV reflect different properties of the associative process between paired stimuli.