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| Research article summary (published 29 Jun 2003): |
Saccadic and perceptual performance in visual search tasks. II. Letter discrimination.
Full Abstract
Can the oculomotor system use shape cues to guide search saccades? Observers searched for target letters (D, U, or X) among distractors (the letter O in the discrimination task and blank locations in the detection task) in Gaussian white noise. We measured the accuracy of first saccadic responses on each trial and perceptual (i.e., button-press) responses in separate trials with the stimulus duration chosen so that the saccadic and perceptual processing times were matched. We calculated the relative efficiency of saccadic decisions compared with perceptual decisions, eta(rel) = (d'(sac)/d'(per))2. Relative efficiency was low but consistently greater than zero in discrimination tasks (15% +/- 6%) and high in detection tasks (60% +/- 10%). We conclude that the saccadic targeting system can use shape cues, but less efficiently than the perceptual system can.
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Author information
Author/s: Murray, Richard F (RF); Beutter, Brent R (BR); Eckstein, Miguel P (MP); Stone, Leland S (LS);
Affiliation: MS 262-2, NASA Ames Research Center, Moffett Field, California 94035-1000, USA.
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.
Journal: Journal of the Optical Society of America. A, Optics, image science, and vision (J Opt Soc Am A Opt Image Sci Vis), published in United States. (Language: eng)
Reference: 2003-Jul; vol 20 (issue 7) : pp 1356-70
Dates: Created 2003/07/18; Completed 2003/09/03; Revised 2006/11/15;
PMID: 12868640, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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