Global vs Local processing
- 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
- 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”.
- 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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