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Weak Central Coherence

Weak Central Coherence. A Comprehensive Theory of Autism. Autistic savant artists. Frith (2003). The need to explain non-social features of autism The need to explain savant abilities The need to explain an apparent lack of common sense

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Weak Central Coherence

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  1. Weak Central Coherence A Comprehensive Theory of Autism

  2. Autistic savant artists

  3. Frith (2003) • The need to explain non-social features of autism • The need to explain savant abilities • The need to explain an apparent lack of common sense • The need to explain anecdotal reports of heightened perceptual abilities • The need to explain an uneven intellectual profile

  4. Block Design Test (Shah & Frith, 1993) • Individuals with autism were significantly faster than matched controls • Pre-segmentation helped controls but not individuals with autism

  5. Embedded Figures Test (Shah & Frith, 1983) • Individuals with autism were significantly faster at locating the hidden figure than matched controls. • Pring et al (1995): Individuals with autism were as fast at solving a jigsaw upside-down as right-way-up

  6. Frith & Snowling (1986) • Ambiguous homographs: • “She was doing some sewing when she noticed a tear in her dress” • “She was watching a sad movie and then a tear appeared in her eye”

  7. Superiority in visual search O’Riordan et al (2001)

  8. ssssssssss ssssssssss s s s s s s s The Navon taskMottron et al (1993)

  9. Narrowing of attentional spreadMann & Walker (2003)

  10. Boundary ExtensionIntraub (1990)

  11. Chapman et al, 2005

  12. Results • Clear boundary extension, with a mean value of 12.51% (i.e. as if 12.5% further away): , t(35) = 10.78, p < .001, d = 1.80. • The degree of boundary extension was virtually identical between those with and without autism

  13. Reduced susceptibility to illusions Happe (1996) • Individuals with autism were less susceptible to illusions than matched controls • But…. • Failed Replication by Ropar & Mitchell (2001)

  14. Thouless (1931)Phenomenal regression to the real object:a demonstration of shape constancy

  15. Ellipse not slanted Perspective slanted Knowledge slanted Ropar and Mitchell (2002) Viewing Condition Stimulus Shape Projected Shape

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