Psychology 2135A/B Lecture Notes - Lecture 6: George Sperling, Visual Cortex, Kelly Lee
17 Oct 2016
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Faces are perceived as wholes: houses are not. Incorrect prediction: predicts no advantage for words or non words. Letter identification faster for words than nonwords. Cannot be explained easily by bottom up processes. A computational model: 3 levels features, letters, words, excitatory and inhibitory connections between levels, target words can suppress activation of other words, letters, non-words are not activated. Study of patients w/acquired (or developmental) brain damage. Emphasis on the preserved cognitive abilities &the deficits. Not getting the full perceptual info: apperceptive. Unable to form stable, pre-semantic representations of objects: can"t perceive an object/can"t form stable representation. Semantics intact given testing in another modality (reading, hearing) The problem is the activation of semantics from visual description. Can"t name what they are seeing, even though they can see all the details. Can identify things as soon as they pick it up. Associative agnosia has damage closer to the temporal lobe.
