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Lecture The role of neurons in the direction-selective retinal circuit in visual processing in the retina and in the visual thalamus
10/14/2024 15:29 The role of neurons in the direction-selective retinal circuit in visual processing in the retina and in the visual thalamusAlina Heukamp-Prof. Michal Rivlin Lab | Student Seminar-PhD Thesis DefenseMon, Oct 14, 15:00 | Gerhard M.J. Schmidt Lecture Hall
The role of neurons in the direction-selective retinal circuit in visual processing in the retina and in the visual thalamus
The lateral geniculate nucleus (LGN) of the thalamus is a major retinal target, involved in processing and relaying visual information, including direction selectivity (DS) and orientation selectivity (OS). How DS and OS are organized in the LGN is poorly understood, as well as whether this information is directly inherited from the retina or generated de novo within the LGN. Using extracellular recordings from across the mouse LGN, we studied DS and OS responses and their topographic organization. We found that DS responses are absent in the central visual field, and that their preferred directions are topographically aligned to match translational optic flow patterns in the remaining visual field. OS responses were uniformly distributed throughout the visual field. By eliminating retinal DS in transgenic mice, we found that DS- but not OS-responses in the LGN were dependent on retinal DS. Thus, LGN DS is inherited from the retina, but retinogeniculate transfer may be topography-dependent, optimizing representations that support visually-guided behaviors.
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