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The computational basis of an identified neuronal circuit for elementary motion detection in dipterous insects

Published online by Cambridge University Press:  01 July 2004

CHARLES M. HIGGINS ,
JOHN K. DOUGLASS  and
NICHOLAS J. STRAUSFELD
CHARLES M. HIGGINS
Affiliation:
Arizona Research Laboratories, Division of Neurobiology, University of Arizona, Tucson Department of Electrical and Computer Engineering, University of Arizona, Tucson
JOHN K. DOUGLASS
Affiliation:
Arizona Research Laboratories, Division of Neurobiology, University of Arizona, Tucson
NICHOLAS J. STRAUSFELD
Affiliation:
Arizona Research Laboratories, Division of Neurobiology, University of Arizona, Tucson
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Abstract

Based on comparative anatomical studies and electrophysiological experiments, we have identified a conserved subset of neurons in the lamina, medulla, and lobula of dipterous insects that are involved in retinotopic visual motion direction selectivity. Working from the photoreceptors inward, this neuronal subset includes lamina amacrine (α) cells, lamina monopolar (L2) cells, the basket T-cell (T1 or β), the transmedullary cell Tm1, and the T5 bushy T-cell. Two GABA-immunoreactive neurons, the transmedullary cell Tm9 and a local interneuron at the level of T5 dendrites, are also implicated in the motion computation. We suggest that these neurons comprise the small-field elementary motion detector circuits the outputs of which are integrated by wide-field lobula plate tangential cells. We show that a computational model based on the available data about these neurons is consistent with existing models of biological elementary motion detection, and present a comparable version of the Hassenstein-Reichardt (HR) correlation model. Further, by using the model to synthesize a generic tangential cell, we show that it can account for the responses of lobula plate tangential cells to a wide range of transient stimuli, including responses which cannot be predicted using the HR model. This computational model of elementary motion detection is the first which derives specifically from the functional organization of a subset of retinotopic neurons supplying the lobula plate. A key prediction of this model is that elementary motion detector circuits respond quite differently to small-field transient stimulation than do spatially integrated motion processing neurons as observed in the lobula plate. In addition, this model suggests that the retinotopic motion information provided to wide-field motion-sensitive cells in the lobula is derived from a less refined stage of processing than motion inputs to the lobula plate.

Keywords

Directional selectivityElementary motion detectionLobula plate tangential cellsVisual motionInsects
Type
Research Article
Information
Visual Neuroscience , Volume 21 , Issue 4 , July 2004 , pp. 567 - 586
Copyright
2004 Cambridge University Press

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