Spatial scale and saccade programming.

Abstract:

:The global effect in eye orienting occurs when saccades land at the 'centre of gravity' of a target stimulus configuration. Short-latency saccades are particularly prone to this effect whereas longer-latency saccades may show more influence of fine detail. Alternative explanations of these effects are considered and data are presented from an experiment in which the influence of different stimulus features on the global effect in a search task was examined. The effect shows a substantially different time course for target-distractor combinations differing in contrast polarity (black vs white) than for combinations differing in shape (circle vs square). It is concluded that the global effect cannot be explained either as a high-level strategic effect or as an effect of automatic fast processing of low-spatial-frequency information in early sensory channels. Instead it is suggested that the visual-spatial-integration characteristic of the global effect is an integral and unavoidable part of the process of selection of saccadic response.

journal_name

Perception

journal_title

Perception

authors

Findlay JM,Gilchrist ID

doi

10.1068/p261159

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

1159-67

issue

9

eissn

0301-0066

issn

1468-4233

journal_volume

26

pub_type

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