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Probability and inter-stimulus interval effects on the p300 from auditory-stimuli

Academic Article
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Overview

authors

  • Polich, John

publication date

  • December 1990

journal

  • International Journal of Psychophysiology  Journal

abstract

  • The relationship between target stimulus probability and inter-stimulus interval (ISI) on the P300 (P3) component of the event-related potential was assessed in two experiments. An auditory discrimination paradigm was employed wherein subjects indicated with a finger tap response the occurrence of a randomly presented 2000 Hz target tone embedded in a series of 1000 Hz tones. Experiment 1 presented stimuli with target probabilities of 0.10, 0.30, and 0.50 at ISIs of 1.5 or 3.0 s and produced P3 amplitudes which decreased with increases in target probability and were smaller at the shorter compared to the longer ISI. Experiment 2 presented stimuli with target probabilities of either 0.20, 0.50, or 0.80 at ISIs of 4.0 and 10.0 s and produced P3 amplitudes which were unaffected by either variable. P3 latency demonstrated relatively few changes in either experiment. When taken together with previous findings, the results suggest that inter-stimulus interval affects P3 amplitude by determining the amount of processing resources available during ERP generation.

subject areas

  • Acoustic Stimulation
  • Adult
  • Electroencephalography
  • Evoked Potentials, Auditory
  • Female
  • Humans
  • Male
  • Probability
  • Reaction Time
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Identity

International Standard Serial Number (ISSN)

  • 0167-8760

Digital Object Identifier (DOI)

  • 10.1016/0167-8760(90)90030-h

PubMed ID

  • 2272863
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Additional Document Info

start page

  • 163

end page

  • 170

volume

  • 10

issue

  • 2

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