Fast temporal adaptation of on-off units in the first optic chiasm of the blowfly |
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Authors: | N. M. Jansonius J. H. van Hateren |
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Affiliation: | Department of Biophysics, University of Groningen, The Netherlands. |
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Abstract: | 1. We recorded from spiking units in the first optic chiasm between lamina and medulla in the brain of the blowfly (Calliphora vicina). Both previously characterized neuron types, on-off units and sustaining units, were encountered. On-off units had a temporal frequency response with a lower cut-off frequency than blowfly photoreceptors. This low cut-off frequency is related to a fast temporal adaptation of the on-off units to trains of short light pulses. Temporal adaptation occurred independently for short on- and off-pulses. 2. On-off units only responded to stimuli of relatively large contrast. Contrasts of less than 10% gave little or no response. |
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Keywords: | On-off units Blowfly Lamina Temporal adaptation Signal rectification |
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