Global vs Local processing

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  • Created by: Chloe
  • Created on: 25-04-15 14:18
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  • Global vs Local processing
    • Two perceptual processes: (1) Initial, passive (suggest stage) (2) Active (integration stage)
    • Navon (2003): Perceptual processing proceeds 'global - local'
      • Idea stemmed from 'Gestalt theory: not only is the whole different from the sum of the parts but the whole is perceived prior to its parts
      • Compound letters:           • Consistent = the letter S made up with independent s's.   •Inconsistent = the letter S made of independent c's.    •Neutral = the letter S made up of small circles.
        • Results:       1. Response faster to global than local letters, “global advantage”     2. Within local condition:     - Responses to inconsistent local letters slower than either to consistent or neutral letters, “global-to-local interference” 3. Global letter identification not affected by ‘inconsistency’, no “local-to-global interference”.
          • The global letter processing is activated first then the local processing kicks in. Global to local interference evident for identification of local letters
    • Global precedence: the overall nature of the perceptual stimulus is perceived prior to its constituent parts.
    • Global address ability:    •Typical mode of processing  •From crude (suggested identity) to fine (confirmed identity)   •Sensory analysis produces crude analysis followed by finally tunes analysis
    • Object representations in memory:    •A general preference for wholes rather than parts    •Object schema (Navon, 2003)    •Memory representations of familiar objects in long-term memory Hierarchically structured or ‘tree structures’ through ‘nodes’ and connections between ‘nodes
    • Change blindness:   •Consistent with the notion of crude-to-fine perceptual processing   •People often fail to detect changes even attended   •Some changes were faster to be detected than other changes:  •Central vs. marginal interests – more time detecting marginal changes than central

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