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Shift of edge-taxis to scototaxis depends on mean luminance and is predicted by a matched filter theory on the responses of fly lamina LMC cells

Published online by Cambridge University Press:  02 June 2009

R. B. Pinter ,
D. Osorio  and
M. V. Srinivasan
R. B. Pinter
Affiliation:
Department of Electrical Engineering, The University of Washington, Seattle
D. Osorio
Affiliation:
The Australian National University, Centre for Visual Sciences, Canberra
M. V. Srinivasan
Affiliation:
The Australian National University, Centre for Visual Sciences, Canberra
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Abstract

The strength of the flanking inhibitory regions of the receptive fields of fly lamina cells (LMC) decreases as the mean luminance is lowered. Simultaneously, the biphasic temporal flash (impulse) response of the lamina cells becomes monophasic on lowering luminance. For a moving-edge stimulus at high mean luminance, this implies that the spatial integration by the larnina cell yields a temporal waveform which is congruent to the waveform of the temporal impulse response of the lamina cell. In other words, the temporal waveform generated by the moving edge is matched to the temporal waveform most preferred by the lamina cell. The edge is the stimulus causing the largest amplitude response at high (above 1 cd/m2) levels of luminance. On lowering luminance, the now monophasic nature of the spatial and temporal impulse responses of the lamina gives a preference not for the edges but for the center of a uniform region. We describe this theory and its behavioral corroboration in walking flies (Lucilia cuprina).

Keywords

Mean luminanceFly lamina cellScototaxisFlanking inhibitory regionsLateral inhibitionEdge responseEdge taxis
Type
Research Articles
Information
Visual Neuroscience , Volume 4 , Issue 6 , June 1990 , pp. 579 - 584
Copyright
Copyright © Cambridge University Press 1990

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