PSYCH 120A Lecture Notes - Lecture 10: Illusory Contours, Short-Term Memory, Long-Term Memory
Document Summary
Neural response to illusory edges tend to be weaker than those to regular visible lines. If they were the same signal, you would perceive a solid line. The perception of illusory edges is thought to depend on top down feeedback from higher order visual areas. V1 neurons whose receptive fields contain an illusory contour will show delayed activation relative to those whose receptive fields contain an actual line. Top down signal takes time to be delivered to v1. Selected info is allowed to undergo further processing. Not in broadbent"s filter model: likelihood of a given piece of information getting through the filter is determined by its threshold. In disjunctive visual search, as the number of items in a visual array increases, the difficulty of finding an item generally does not change. In conjunctive visual search, as the number of items in the visual array increases, the difficulty of finding an item generally increases.
