Elsevier

Vision Research

Volume 36, Issue 14, July 1996, Pages 2177-2187
Vision Research

Using Eye Saccades to Assess the Selectivity of Search Movements

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Abstract

The degree of selectivity or guidance underlying search was tested by having subjects search for a target (a red vertical or green horizontal bar) among Similar (red horizontal and green vertical bars) and Dissimilar distractors (blue and yellow diagonal bars). If search is indeed a guided process, then the Dissimilar items should not be given the same scrutiny as elements sharing a feature with the target. The frequency of eye movements directed to the two distractor types was used as an indicator of this scrutiny. The analysis revealed almost equal percentages of saccades to Similar and Dissimilar elements (55% and 45%, respectively). Although indicating some evidence for selectivity during oculomotor search, this finding suggests that simpler and less optimal strategies may undermine the more efficient guided search algorithm. Copyright © 1996 Elsevier Science Ltd.

Keywords

Eye movements
Oculomotor
Guided search
Attention

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