Global effect of a nearby distractor on targeting eye and hand movements |
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Authors: | Sailer Uta Eggert Thomas Ditterich Jochen Straube Andreas |
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Institution: | Department of Neurology, Center for Sensorimotor Research, Ludwig-Maximilians-University Munich, Munich, Germany. usailer@nefo.med.uni-muenchen.de |
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Abstract: | Eye-hand coordination was investigated with the global effect paradigm. In this paradigm, saccades typically land in between the target and a nearby presented distractor, the configuration's center of gravity. This so-called global effect, or spatial averaging, is attributed to incomplete target selection. Four experiments demonstrated a similar effect for hand movements; thus, eye and hand are coupled during target selection. However, under some conditions the global effect was different for eye and hand, suggesting that their coupling is not achieved through a shared target representation. Instead, eye and hand seem to use 2 separate target representations that exchange information. The convergent amplitudes of eye and hand with simultaneous execution support this interpretation. Latencies showed a similar converging pattern. |
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