Spatially parallel processing of within-dimension conjunctions

Linnell, Karina J and Humphreys, Glyn W.. 2001. Spatially parallel processing of within-dimension conjunctions. Perception, 30(1), pp. 49-60. ISSN 0301-0066 [Article]

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Abstract or Description

Within-dimension conjunction search for red - green targets amongst red - blue, and blue - green, nontargets is extremely inefficient (Wolfe et al, 1990 Journal of Experimental Psychology: Human Perception and Performance 16 879 - 892). We tested whether pairs of red - green conjunction targets can nevertheless be processed spatially in parallel. Participants made speeded detection responses whenever a red - green target was present. Across trials where a second identical target was present, the distribution of detection times was compatible with the assumption that targets were processed in parallel (Miller, 1982 Cognitive Psychology 14 247 - 279). We show that this was not an artifact of response-competition or feature-based processing. We suggest that within-dimension conjunctions can be processed spatially in parallel. Visual search for such items may be inefficient owing to within-dimension grouping between items.

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Date Deposited:

25 Mar 2011 10:49

Last Modified:

15 May 2019 10:02

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Yes, this version has been peer-reviewed.


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