Wide-field, motion-sensitive neurons and matched filters for optic flow fields |
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Authors: | Matthias O Franz Holger G Krapp |
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Institution: | (1) Max Planck Institute for Biological Cybernetics, Spemannstrasse 38, 72076 Tübingen, Germany, DE |
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Abstract: | The receptive field organization of a class of visual interneurons in the fly brain (vertical system, or VS neurons) shows
a striking similarity to certain self-motion-induced optic flow fields. The present study compares the measured motion sensitivities
of the VS neurons (Krapp et al. 1998) to a matched filter model for optic flow fields generated by rotation or translation.
The model minimizes the variance of the filter output caused by noise and distance variability between different scenes. To
that end, prior knowledge about distance and self-motion statistics is incorporated in the form of a “world model”. We show
that a special case of the matched filter model is able to predict the local motion sensitivities observed in some VS neurons.
This suggests that their receptive field organization enables the VS neurons to maintain a consistent output when the same
type of self-motion occurs in different situations.
Received: 14 June 1999 / Accepted in revised form: 20 March 2000 |
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