02-14 Lecture Slides (Final)

Associative faces prosopagnosia 2 21413 how many

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Unformatted text preview: tion WORK D Word Level K WORD Letter Level Feature Level The top-down signal from the word level leads to the word superiority effect! Neural Basis of Visual Pattern Recognition (covered on 02/12) n༆  n༆  Damage to the visual areas of the brain can lead to visual recognition impairments Different visual recognition disorders ¨༊  Letters and words: Alexia (or acquired dyslexia) n༆  Different from developmental dyslexia ¨༊  Objects: Visual agnosias (apperceptive vs. associative) ¨༊  Faces: Prosopagnosia 2 2/14/13 How Many Subsystems for Pattern Recognition? (covered on 02/12) n༆  Farah’s (1992) analysis suggests that 2 subsystems, not 3, support the recognition of faces, objects, and letters/words Crucial Crucial Main Points of Today’s Lecture n༆  Two key features of attention (both auditory and visual) is “selectivity” and “limited capacity” There are different types of attention n༆  Different metaphors are used to characterize attention n༆  ¨༊  ¨༊  ¨༊  n༆  n༆  Selective, divided, & sustained (vigilance) Auditory selective attention: “filter” Visual selective attention: “spotlight” and “glue” In auditory attention, the filtering out of irrelevant information can occur early or late, depending on the task demand Visual selective attention can flexibly change its width and also helps “glue together” separate features What Is Attention? n༆  Two characteristics of attention ¨༊  Selectivity ¨༊  Limited capacity n༆  n༆  Focusing on a particular stimulus limits the amount of processing you can do for other stimuli A famous quote from William James (1890) “Everybody knows what attention is. It is the taking possession by the mind, in clear and vivid form, of one out of what seem several simultaneously possible objects or trains of thought. It implies withdrawal from some things in order to deal effectively with others.” n༆  But is it really that simple? ¨...
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