Saccadic eye movements and perceptual judgments reveal a shared visual representation that is increasingly accurate over time

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • University of Aberdeen

Abstract

Although there is evidence to suggest visual illusions affect perceptual judgments more than actions, many studies have failed to detect task-dependant dissociations. In two experiments we attempt to resolve the contradiction by exploring the time-course of visual illusion effects on both saccadic eye movements and perceptual judgments, using the Judd illusion. The results showed that, regardless of whether a saccadic response or a perceptual judgement was made, the illusory bias was larger when responses were based on less information, that is, when saccadic latencies were short, or display duration was brief. The time-course of the effect was similar for both the saccadic responses and perceptual judgements, suggesting that both modes may be driven by a shared visual representation. Changes in the strength of the illusion over time also highlight the importance of controlling for the latency of different response systems when evaluating possible dissociations between them.

Details

Original languageEnglish
Pages (from-to)111-119
Number of pages9
JournalVision Research
Volume51
Issue number1
Publication statusPublished - 1 Jan 2011

Keywords

  • Perception and action, Saccadic eye movements, Time-course of processing, Visual illusions

ASJC Scopus subject areas