Josh McDermott lectures on attention as part of MIT's course 9.35, Perception. The session examines how the visual and auditory systems track and identify objects over time, comparing competing theories of attention and object recognition. McDermott works through the perceptual mechanisms that let the brain bind sensory features into coherent objects and follow them despite noise or occlusion, drawing on classic and current experimental findings from vision and hearing research. The lecture runs about thirty six minutes and fits into the course's broader sequence on perceptual organization. It is aimed at students who already have some grounding in perception coursework, and it treats attention as a mechanism for selecting and maintaining object representations rather than as a single unified process, weighing the evidence for different models of how that selection happens.