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Gepubliceerd in: Psychological Research 1/2008

01-01-2008 | Original Article

Memory processes in multiple-target visual search

Auteurs: Christof Körner, Iain D. Gilchrist

Gepubliceerd in: Psychological Research | Uitgave 1/2008

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Abstract

Gibson, Li, Skow, Brown, and Cooke (Psychological Science, 11, 324–327, 2000) had participants carry out a search task in which they were required to detect the presence of one or two targets. In order to successfully perform such a multiple-target visual search task, participants had to remember the location of the first target while searching for the second target. In two experiments we investigated the cost of remembering this target location. In Experiment 1, we compared performance on the Gibson et al. task with performance on a more conventional present–absent search task. The comparison suggests a substantial performance cost as measured by reaction time, number of fixations and slope of the search functions. In Experiment 2, we looked in detail at refixations of distractors, which are a direct measure of attentional deployment. We demonstrated that the cost in this multiple-target visual search task was due to an increased number of refixations on previously visited distractors. Such refixations were present right from the start of the search. This change in search behaviour may be caused by the necessity of having to remember a target-allocating memory for the upcoming target may consume memory capacity that may otherwise be available for the tagging of distractors. These results support the notion of limited capacity memory processes in search.
Voetnoten
1
Note that some of these fixations occurred after the target has been identified while the manual response is being generated. For the target present trials there were on average 0.9 such fixations and we can use this as one estimate of the number of fixations that occurred after the target identification and before the manual response was generated.
 
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Metagegevens
Titel
Memory processes in multiple-target visual search
Auteurs
Christof Körner
Iain D. Gilchrist
Publicatiedatum
01-01-2008
Uitgeverij
Springer-Verlag
Gepubliceerd in
Psychological Research / Uitgave 1/2008
Print ISSN: 0340-0727
Elektronisch ISSN: 1430-2772
DOI
https://doi.org/10.1007/s00426-006-0075-1

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