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Is the target-to-target interval a critical determinant of P3 amplitude?

  • CRAIG J. GONSALVEZ (a1), EVIAN GORDON (a2), SANDRA GRAYSON (a2), ROBERT J. BARRY (a1), ILLARIO LAZZARO (a2) and HOMAYOUN BAHRAMALI (a2)...

Abstract

The P3 amplitude is augmented by decrements in target-probability, increments in the number of nontargets preceding the target, and extensions of the interstimulus interval (ISI). Each of these changes prolongs the target-to-target interval (TTI) and, consequently, results attributed to these factors might, at least partially, be accounted for by the TTI. Recent research also indicates that the P3s elicited by targets in one-, two-, and three-stimuli tasks (in which the TTI remains invariant) are similar. However, the TTI has not been examined systematically in previous research. The present study had subjects listen to a randomized ISI (0.5, 1, 2, or 4 s) version of the auditory oddball task in which targets occurred after one, two, three, four, or five nontargets. Event-related potentials were analyzed based on ISI, sequential structure, and TTI. The study examined sequence and ISI effects independent of TTI effects and demonstrated that extensions of ISI affected N1 but not P3 amplitude, extensions of TTI enhanced P3 amplitude independent of sequential structure, and sequential structure failed to influence P3 amplitude when TTI was controlled.

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Corresponding author

Address reprint requests to: Craig Gonsalvez, Department of Psychology, University of Wollongong, Wollongong, NSW 2522, Australia. E-mail: craig_gonsalvez@uow.edu.au.

Keywords

Is the target-to-target interval a critical determinant of P3 amplitude?

  • CRAIG J. GONSALVEZ (a1), EVIAN GORDON (a2), SANDRA GRAYSON (a2), ROBERT J. BARRY (a1), ILLARIO LAZZARO (a2) and HOMAYOUN BAHRAMALI (a2)...

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