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Cognitive Processes in Eye Guidance$
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Geoffrey Underwood

Print publication date: 2005

Print ISBN-13: 9780198566816

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780198566816.001.0001

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Eye guidance and visual search

Eye guidance and visual search

(p.259) 11 Eye guidance and visual search
Cognitive Processes in Eye Guidance

John M. Findlay

Iain D. Gilchrist

Oxford University Press

This chapter presents an account of eye control during visual search. The primary mechanism for selection of the destination for each saccade involves the generation of an oculomotor salience map, in which processes of biased competition boost the salience signal at locations containing visual material that is similar to the search target. Generation of the salience map is a dynamic process. This is most clearly seen in the statistical properties of saccades in a task. Individual saccades appear generally to be ballistic, with the end point determined in advance, although the trajectory can reflect the dynamic activity. Additional forward planning mechanisms that allow saccade destinations to be ‘pipelined’ in some circumstances supplement the salience map. Further processes involving visual memory, such as inhibition of return, operate to allow saccades to be distributed over different regions of the search area.

Keywords:   eye guidance, visual search, salience map, saccades

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