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EVOKED POTENTIAL CORRELATES OF STIMULUS NOVELTY

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Date Issued:
1982
Summary:
Sokolov's (1963) hypothesis of selective extinction of the orienting response accounts for the phenomenon of dishabituation by a discrepancy between immediate sensory input and a stored template of a habituated stimulus. The "oddball" stimulus procedure often used to elicit the P300 evoked potential waveform bears resemblance to a habituation-dishabituation paradigm. In the present experiment subjects were habituated to a 70 dB tone burst which was then occasionally replaced by 50, 60, 80 or 90 dB stimuli. According to a selective extinction model of the P300, equal absolute amounts of stimulus change should evoke equal amplitude waveforms. While the decreased intensity stimuli did evoke a P300, the largest P300s were associated with an intensity increase. The N200 component was seen to be largest with intensity decrease. It is suggested that the N200 is the evoked potential correlate of discrepancy detection which can be obscured by an intensity-driven P300.
Title: EVOKED POTENTIAL CORRELATES OF STIMULUS NOVELTY.
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Name(s): JASIUKAITIS, PAUL ALEXANDER
Florida Atlantic University, Degree grantor
Nash, Allan J., Thesis advisor
Charles E. Schmidt College of Science
Department of Psychology
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Issuance: monographic
Date Issued: 1982
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, FL
Physical Form: application/pdf
Extent: 76 p.
Language(s): English
Summary: Sokolov's (1963) hypothesis of selective extinction of the orienting response accounts for the phenomenon of dishabituation by a discrepancy between immediate sensory input and a stored template of a habituated stimulus. The "oddball" stimulus procedure often used to elicit the P300 evoked potential waveform bears resemblance to a habituation-dishabituation paradigm. In the present experiment subjects were habituated to a 70 dB tone burst which was then occasionally replaced by 50, 60, 80 or 90 dB stimuli. According to a selective extinction model of the P300, equal absolute amounts of stimulus change should evoke equal amplitude waveforms. While the decreased intensity stimuli did evoke a P300, the largest P300s were associated with an intensity increase. The N200 component was seen to be largest with intensity decrease. It is suggested that the N200 is the evoked potential correlate of discrepancy detection which can be obscured by an intensity-driven P300.
Identifier: 14125 (digitool), FADT14125 (IID), fau:10939 (fedora)
Degree granted: Thesis (M.A.)--Florida Atlantic University, 1982.
Collection: FAU Electronic Theses and Dissertations Collection
Note(s): Charles E. Schmidt College of Science
Subject(s): Evoked potentials (Electrophysiology)
Held by: Florida Atlantic University Libraries
Persistent Link to This Record: http://purl.flvc.org/fcla/dt/14125
Sublocation: Digital Library
Use and Reproduction: Copyright © is held by the author with permission granted to Florida Atlantic University to digitize, archive and distribute this item for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder.
Use and Reproduction: http://rightsstatements.org/vocab/InC/1.0/
Host Institution: FAU
Is Part of Series: Florida Atlantic University Digital Library Collections.