Polarization Vision and the Development of Retinal Network Models. Neuronal Information Transfer Functions From Cones and Horizontal Cells to Bipolar Cells
2008
Kamermans, Maarten | Hawryshyn, Craig
This report results from a contract tasking The Netherlands Ophthalmic Research Institute as follows: The final study demonstrated how cones compress natural stimuli into a dynamic range the rest of the visual system can cope with. Furthermore, the study demonstrated how horizontal cells, that store global stimulus parameters such as spectral composition and e-vector orientation of the global stimulus, adjust the gains of the cone synapse such that it suits the global stimulus conditions. It was also found that bipolar cells process these responses and how interaction between inputs to bipolar cells enhances their sensitivity to changes of intensity, color and presumably e-vector orientation. We identified an additional level of gain control in bipolar cells. Finally additional opponent processing of horizontal cells could not be revealed at the ganglion cell level. This indicates that just as in the spectral domain, opponency in horizontal cells is an efficient way of information coding and does not reflect a critical analysis step in 3-vector processing. Horizontal cell system is the memory of the global spectral composition and e-vector orientation of the animal.
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