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J Neurophysiol 85: 724-734, 2001;
0022-3077/01 $5.00
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The Journal of Neurophysiology Vol. 85 No. 2 February 2001, pp. 724-734
Copyright ©2001 by the American Physiological Society

Binocular Contributions to Optic Flow Processing in the Fly Visual System

Holger G. Krapp,1 Roland Hengstenberg,2 and Martin Egelhaaf1

 1Lehrstuhl für Neurobiologie, Fakultät für Biologie, Universität Bielefeld, D-33501 Bielefeld; and  2Max-Planck-Institut für Biologische Kybernetik, D-72076 Tubingen, Germany

Krapp, Holger G., Roland Hengstenberg, and Martin Egelhaaf. Binocular Contributions to Optic Flow Processing in the Fly Visual System. J. Neurophysiol. 85: 724-734, 2001. Integrating binocular motion information tunes wide-field direction-selective neurons in the fly optic lobe to respond preferentially to specific optic flow fields. This is shown by measuring the local preferred directions (LPDs) and local motion sensitivities (LMSs) at many positions within the receptive fields of three types of anatomically identifiable lobula plate tangential neurons: the three horizontal system (HS) neurons, the two centrifugal horizontal (CH) neurons, and three heterolateral connecting elements. The latter impart to two of the HS and to both CH neurons a sensitivity to motion from the contralateral visual field. Thus in two HS neurons and both CH neurons, the response field comprises part of the ipsi- and contralateral visual hemispheres. The distributions of LPDs within the binocular response fields of each neuron show marked similarities to the optic flow fields created by particular types of self-movements of the fly. Based on the characteristic distributions of local preferred directions and motion sensitivities within the response fields, the functional role of the respective neurons in the context of behaviorally relevant processing of visual wide-field motion is discussed.




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