PS260 Lecture Notes - Lecture 4: Bigram, Agnosia, Outline Of Object Recognition
Document Summary
Apperceptive agnosia: person sees the elements of an object (shape, colour, position) but cant seem to put these pieces together to make out the object. Associative agnosia: see an object but cant link what they see to their basic visual knowledge (ex. See a shoe but cant link that the shoe is worn on the feet) Object recognition involves some complexity and is influenced by the context in which the objects are encountered. Processes that are directly shaped by the stimulus are called bottom-up processes. Processes shaped by knowledge are called top-down processes. Recognition could begin with visual features such as lines, curves, diagonals, and with these features, one can start assembling the larger picture. Integrative agnosia: caused by damage to parietal cortex; patients are unable to do tasks that require them to determine how features are bound together to form an object. Tachistocope: device used to present stimuli for controlled amounts of time.
