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Carrasco M, Penpeci-Talgar C & Cameron EL (2001) Characterizing
visual performance fields: Effects of transient covert attention,
spatial frequency, eccentricity, task and set size. Spatial Vision,
15: 61-75.
Abstract
We investigated whether transient covert attention would differentially
affect "performance fields" (shape depicted by percent correct
performance at particular locations in the visual field) for orientation
discrimination, detection and localization tasks, while manipulating a
number of visual factors. We found that although attention improved overall
performance, it did not affect performance fields. Two patterns were observed
regardless of the presence of a local post-mask, the stimulus orientation,
or the task. A horizontal-vertical anisotropy (HVA) became more pronounced
as spatial frequency, eccentricity and set size increased. A vertical
meridian asymmetry (VMA) became more pronounced as spatial frequency and
eccentricity increased. We conclude that performance fields are determined
by visual, rather than by transient attentional, constraints.
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