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Behavioural Neurology
Volume 13, Issue 1-2, Pages 75-87
http://dx.doi.org/10.1155/2002/635685

Knowing What You Need But Not What You Want: Affordances and Action-Defined Templates in Neglect

Glyn W. Humphreys and M. Jane Riddoch

Behavioural Brain Sciences Centre, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK

Received 2 July 2002; Accepted 2 July 2002

Copyright © 2002 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We examined search for target objects in a patient, MP, showing symptoms of left unilateral neglect. The conditions varied how the target was defined, the numbers of targets and distractors, and whether search was for multiple or single targets. We found that search was substantially improved when the target was defined by a description of its action rather than its name. This advantage for action-defined targets increased with larger display sizes. For both action and name-defined targets, there were also larger effects of the number of distractors when search was for multiple rather than single targets, even when the numbers of distractors were kept constant. However, these effects were increased for name-defined targets. The differences between action- and name-defined targets decreased when objects were replaced with words. The data suggest that search could be based on action-defined templates of targets, activated by affordances from objects. The action-defined templates facilitated detection and reduced MP's tendency to re-search displays.