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- W2074083800 abstract "The speed of signal conduction is a factor determining the temporal properties of individual neurons and neuronal networks. We observed very different conduction velocities within the receptive field of fast-type On-Off transient amacrine cells in carp retina cells, which are tightly coupled to each other via gap junctions. The fastest speeds were found in the dorsal area of the receptive fields, on average five times faster than those detected within the ventral area. The asymmetry was similar in the On- and Off-part of the responses, thus being independent of the pathway, pointing to the existence of a functional mechanism within the recorded cells themselves. Nonetheless, the spatial decay of the graded-voltage photoresponse within the receptive field was found to be symmetrical, with the amplitude center of the receptive field being displaced to the faster side from the minimum-latency location. A sample of the orientation of varicosity-laden polyaxons in neurobiotin-injected cells supported the model, revealing that approximately 75% of these processes were directed dorsally from the origin cells. Based on these results, we modeled the velocity asymmetry and the displacement of amplitude center by adding a contribution of an asymmetric polyaxonal inhibition to the network. Due to the asymmetry in the conduction velocity, the time delay of a light response is proposed to depend on the origin of the photostimulus movement, a potentially important mechanism underlying direction selectivity within the inner retina." @default.
- W2074083800 created "2016-06-24" @default.
- W2074083800 creator A5023020166 @default.
- W2074083800 creator A5079838933 @default.
- W2074083800 creator A5086774168 @default.
- W2074083800 creator A5089151377 @default.
- W2074083800 date "2003-09-29" @default.
- W2074083800 modified "2023-09-24" @default.
- W2074083800 title "Asymmetric Temporal Properties in the Receptive Field of Retinal Transient Amacrine Cells" @default.
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- W2074083800 doi "https://doi.org/10.1085/jgp.200308828" @default.
- W2074083800 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2233775" @default.
- W2074083800 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14517270" @default.