| Autor: |
Syozo Yasui, Tetsuo Furukawa, M.B.A. Djamgoz, M. Yamada |
| Rok vydání: |
2005 |
| Předmět: |
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| Zdroj: |
Proceedings of 1993 International Conference on Neural Networks (IJCNN-93-Nagoya, Japan). |
| DOI: |
10.1109/ijcnn.1993.716708 |
| Popis: |
Horizontal cells (HCs), second-order retinal neurons, form a layer of network via gap junctions and the lateral signal transmission within this HC system can be modelled by a 2-dimensional cable theory. It is well known that a dopamine-releasing feedback pathway from third-order neurons can change the receptive field size of HCs by modulating the coupling resistance of the gap junctions in a manner depending on the light/dark adaptation of the retina. In this paper, we describe our finding that the receptive field size of an HC subtype in the carp retina can be controlled by a special type of synaptic mechanism made by short-wavelength (blue and/or green) sensitive cone photoreceptors. Thus, the situation is quite different from the dopamine-mediated system, in that the receptive field size changes by modulating the presynaptic membrane resistance associated with short-wavelength cone signals, rather than by modulating the gap-junctional resistance. We also report that the synapse in question is inactivated by dark-adaptation of the retina. The present mechanism is a new plasticity scheme for modulating the efficacy of lateral signal transmission across the outer retina. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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