Cite as:
Poom L, 2009, "Integration of colour, motion, orientation, and spatial frequency in visual search" Perception 38(5) 708 – 718
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Integration of colour, motion, orientation, and spatial frequency in visual search

Leo Poom

Received 8 April 2008, in revised form 25 November 2008; published online 1 June 2009

Abstract. Response times (RTs) in visual search were measured with either a single target specified by colour, motion, spatial frequency, or orientation alone, or specified by pairwise conjunctions of these features, or by presenting double targets, each specified by a separate feature. First, for all feature combinations, except for motion – colour, RTs were faster when double features were used to specify a single target than when they specified separate targets, implying location-specific redundancy gains predicted by coactivation on a common location-specific map. Second, coactivation, as revealed by race-model violations, occurred for all double-feature single-target conditions except the motion – colour and colour – orientation combinations. No violations occurred in double-target conditions. Taken together, these results are accounted for by well-known feature-specific sensitivities of cortical V1 cells and provide further evidence for a V1 locus of redundancy gain in visual search.

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