Josh McDermott, teaching MIT's course 9.35 Perception, lectures on the early stages of the visual pathway, focusing on the lateral geniculate nucleus and the primary visual cortex. He covers how the LGN relays and filters retinal signals before they reach the cortex, and how neurons in V1 respond to features like orientation, spatial frequency, and receptive field structure. The lecture builds on earlier material on the retina and eye to explain how raw visual input gets transformed into the organized representations that support perception. Expect a blackboard and slide based classroom lecture aimed at students already familiar with basic neuroscience, part of MIT's OpenCourseWare series for course 9.35, Spring 2024, running about 75 minutes.