Cognition - Lecture 10 (Memory)

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  • Lecture 10 - Memory
    • Change blindness and the transition from "iconic" to visual working memory (VSTM)
      • Different attributes of objects presently in the visual field are represented by local activity in multiple visual cortex "maps"
        • Separate maps for features such as movement, colour
      • The sensory activity persists beyond the stimulus offset ("sensory memory") unless overwritten by a new retinal image, but not for long
      • While it remains available, binding of features by  focal attention creates "object files" in a visual working memory
    • Images vs. propositional representations
      • Physical images
        • Decipit
        • In an analogue manner
        • Are spatially isomorphic with what they represent
      • Propositional representations:
        • Describe (objects, features)
        • Use discrete symbols
        • Have conventional/arbitary correspondence between symbol and symbolised
    • Kosslyn's image-scanning experiments
      • S memorising map, which is then removed
      • Instructed to "focus" mentally on place
      • The name of another place is then presented
      • S is interested to "look for" that place in their mental image, pressing one key when they find Y, another if they cannot, as quickly as possible
      • Rosslyn concludes:
        • S is "scanning" a mental image of the scene much as one would scan an exterior scene or a picture with eye movements


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