Object Recognition and Goal-Directed Eye or Hand Movements are Coupled by Visual Attention
A dual-task paradigm required the preparation of a goal-directed movement (hand or eye) concurrently with a letter discrimination task. In the first experiment a hand movement to a location on a virtual circle was required and indicated by a central cue. Simultaneously, the ability to discriminate between the symbols “E” and “3”, presented tachioscopically with various delays on a circular position within surrounding distractors, was taken as a measure of selective perceptual performance. The location of discrimination target remained constant within blocks and was known to the subjects. In the second experiment a saccadic eye movement was required instead of a pointing movement. The data in both experiments clearly demonstrate that discrimination performance is superior when the discrimination target location (DT) is identical to the location of the movement target (MT). When DT and MT refer to different objects, performance deteriorates drastically. We conclude that it is not possible to maintain attention on a stimulus for the purpose of discrimination while preparing a movement to a spatially separate object. This holds, in a quantitatively similar way, for both saccades and manual pointing.
KeywordsVisual Attention Movement Target Discrimination Performance Movement Onset Movement Execution
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- Deubel H., Schneider WX, Paprotta I (in press) Selective dorsal and ventral processing: Evidence for a common attentional mechanism in reaching and perception. Visual CognitionGoogle Scholar
- Jeannerod M (1981) Intersegmental coordination during reaching at natural visual objects. In J. Long and A. Baddeley (Eds.) Attention and Performance IX. Hillsdale, NJ: Erlbaum, pp 153–169Google Scholar
- Klein R (1980) Does oculomotor readiness mediate cognitive control of visual attention ? In R. Nickerson (Ed.), Attention and Performance VIII. Hillsdale, NJ: Erlbaum, pp 259–276Google Scholar
- Rizzolatti G, Riggio L, Sheliga BM (1994) Space and selective attention. In C. Umilta and M. Moscovitch (Eds.), Attention and Performance XV Conscious and nonconscious information processing). Cambridge, MA: MIT Press, pp 231–265Google Scholar
- Schneider WX, Deubel H (1995) Visual attention and saccadic eye movements: Evidence for obligatory and selective spatial coupling. In Findlay JM, Walker R, Kentridge RW (Eds.) Eye movement research. Amsterdam: Elsevier, pp 317–324Google Scholar
- Shepherd M, Findlay JM, Hockey RJ (1986) The relationship between eye movements and spatial attention. Q J Exp Psychol 38A, 475–491Google Scholar