Author Type

Graduate Student

Date of Award

1982

Document Type

Thesis

Publication Status

Version of Record

Submission Date

October 2026

Thesis/Dissertation Advisor [Chair]

Nash, Allan J.

Abstract

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.

Extent

76 p.

Comments

Thesis (M.A.)--Florida Atlantic University, 1982.|Charles E. Schmidt College of Science|FAU Electronic Theses and Dissertations Collection|Thesis (M.A.)--Florida Atlantic University, 1982.

Identifier

FADT14125

Format

pdf

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