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6 Cards in this Set
- Front
- Back
Double Dissociation (Definition)
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- H.L. Teuber introduced the term double dissocation.
- Double dissociation is an experimental technique by which two areas are functionally dissociated by behavioural tests. - Each test affects one lesion zone and not the other. - Broca's patients could no longer speak but could understand language. - Wernicke's patients could no longer understand language but could produce jumbled speech. |
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Double Dissociation (Study 1)
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- Martins and Farrajota (2006)
- Proper and common names - ACB had an aphasic disorder with impaired naming, sparing proper names. - JFJ had normal language abilities and semantic knowledge about people, but a marked anomia for people's names. - Evidence for a double dissociation. |
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Double Dissociation (Study 2)
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- Klauer and Zhao (2004)
- Double dissocations in visual and short term memory. - A visual short term memory task was more strongly disrupted by visual then spatial interference. - A spatial task was simultaneously more strongly disrupted by spatial than visual interference. - Memory tasks comprised a spatial task and a visual task. - Interference conditions comprised a movement discrimination task and a colour discrimination task. - A reliable crossed double dissocation of a visual and spatial component in the short-term retention of single stimuli was demonstrated. |
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Pure Alexia (Definition)
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- Pure Alexia is a reading disorder that occurs in literate individuals after a lesion in the left occipito-temporal rergion.
- There is the word-length effect. - Pure Alexia was first extensively described by Dejerine. - Dejerine describes pure alexia as a 'disconnection syndrome' that isolates the 'centre for optic images of the letters'. - Because this language centre cannot be accessed through visual stimulation, the patient cannot read. |
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Pure Alexia (Study 1)
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- Tadashi (2007)
- Longitudinal fMRI study - 7 days after a haemorrhage in the left occipito-temporal region when patient showed LBL reading. - Repeated again 50 days after, when his LBL reading had resolved. - Broca's area was strongly activated during his LBL reading. |
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Pure Alexia (Study 2)
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- Ingles and Eskes (2008)
- The extent to which LBL reading results from a specific orthographic deficit. - The current study directly compared processing of letters and digits in a LBL reader. - Using a RSVP task and a speeded matching task. - In the RSVP task they had increased difficulty reporting the target identities when they were letters. - LBL reading results from visuoperceptual encoding deficit that particularly affects letters. |