Unfocused spatial attention underlies the crowding effect in indirect form vision.

Abstract:

:We studied mechanisms underlying the crowding effect in indirect form vision by measuring recognition contrast sensitivity of a character with flankers to the left and right. Attentional and featural contributions to the effect can be separated by a new paradigm that distinguishes pattern location errors from pattern recognition errors and further by manipulating the focusing of spatial attention through a positional cue, appearing 150 ms before the target. Measurements were on the horizontal meridian, at 1, 2, and 4 deg eccentricity, and a range of flankers' distances were used. Our results show that in normal indirect viewing, the impairment of character recognition by crowding is--in particular at intermediate flanker distances--caused to a large part by spatially imprecise focusing of attention. In contrast, the enhancement of performance by a transient positional cue seems mediated through a separate attentional mechanism such that attentional locus and focus are controlled independently. Our results furthermore lend psychophysical support to a separate coding of the what and where in pattern recognition.

journal_name

J Vis

journal_title

Journal of vision

authors

Strasburger H

doi

10.1167/5.11.8

keywords:

subject

Has Abstract

pub_date

2005-12-29 00:00:00

pages

1024-37

issue

11

issn

1534-7362

pii

5/11/8

journal_volume

5

pub_type

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