Combined expectancies

Event-related potentials reveal the early benefits of spatial attention that are obscured by reaction time measures

Todd C. Handy, Vanessa Green, George R Mangun, Raymond M. Klein

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Visual spatial attention has been likened to a "spotlight" that selectively facilitates the perceptual processing of events at covertly attended locations. However, if participants have advance knowledge of the likely location of an impending target and the likely response it will require, facilitation in response performance does not occur for targets at the expected (or attended) location that require an unexpected response. Event-related potentials (ERPs) were recorded during a discrimination task in which the most likely target location and target response were simultaneously cued prior to target onset. The ERPs showed evidence of enhanced perceptual-level processing for all targets at attended locations. These results suggests that the lack of response facilitation for unexpected targets at attended locations is likely due to postperceptual processes that are activated by the inclusion of nonspatial stimulus expactancies, response expectacies, or both.

Original languageEnglish (US)
Pages (from-to)303-317
Number of pages15
JournalJournal of Experimental Psychology: Human Perception and Performance
Volume27
Issue number2
DOIs
StatePublished - Jan 1 2001

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Evoked Potentials
Reaction Time
Expectancy
Spatial Attention
Event-related Potentials

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Arts and Humanities (miscellaneous)
  • Behavioral Neuroscience

Cite this

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