PMID: 9440361Jan 1, 1997Paper

Independent coding of target distance and direction in visuo-spatial working memory

Psychological Research
S Chieffi, D A Allport

Abstract

The organization of manual reaching movements suggests considerable independence in the initial programming with respect to the direction and the distance of the intended movement. It was hypothesized that short-term memory for a visually-presented location within reaching space, in the absence of other allocentric reference points, might also be represented in a motoric code, showing similar independence in the encoding of direction and distance. This hypothesis was tested in two experiments, using adult human subjects who were required to remember the location of a briefly presented luminous spot. Stimuli were presented in the dark, thus providing purely egocentric spatial information. After the specified delay, subjects were instructed to point to the remembered location. In Exp. 1, temporal decay of location memory was studied, over a range of 4-30 s. The results showed that (a) memory for both the direction and the distance of the visual target location declined over time, at about the same rate for both parameters; however, (b) errors of distance were much greater in the left than in the right hemispace, whereas direction errors showed no such effect; (c) the distance and direction errors were essentially uncorrelated, at...Continue Reading

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Citations

Oct 21, 2006·Experimental Brain Research·Florence GaunetYves Rossetti
Apr 30, 2010·Experimental Brain Research·Katja FiehlerDenise Y P Henriques
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