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An adaptive Reichardt detector model of motion adaptation in insects and mammals

Published online by Cambridge University Press:  02 June 2009

Colin W.G. Clifford
Affiliation:
Department of Psychology, University College London, Gower Street, London WC1E 6BT, UK Centre for Visual Science, Australian National University, Canberra, Australia
Michael R. Ibbotson
Affiliation:
Developmental Neurobiology, Research School of Biological Sciences, Australian National University, Canberra ACT 2601, Australia
Keith Langley
Affiliation:
Department of Psychology, University College London, Gower Street, London WC1E 6BT, UK

Abstract

There are marked similarities in the adaptation to motion observed in wide-field directional neurons found in the mammalian nucleus of the optic tract and cells in the insect lobula plate. However, while the form and time scale of adaptation is comparable in the two systems, there is a difference in the directional properties of the effect. A model based on the Reichardt detector is proposed to describe adaptation in mammals and insects, with only minor modifications required to account for the differences in directionality. Temporal-frequency response functions of the neurons and the model are shifted laterally and compressed by motion adaptation. The lateral shift enhances dynamic range and differential motion sensitivity. The compression is not caused by fatigue, but is an intrinsic property of the adaptive process resulting from interdependence of temporal-frequency tuning and gain in the temporal filters of the motion detectors.

Type
Research Articles
Copyright
Copyright © Cambridge University Press 1997

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