Split-brain research into hemispheric lateralisation
- Created by: georgia-merle
- Created on: 15-02-18 12:50
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- Split-brain research into hemispheric lateralisation
- Hemispheric Lateralisation
- Concerns behaviours controlled by just one hemisphere
- For example, language is in the left hemisphere
- Concerns behaviours controlled by just one hemisphere
- Sperry (1968)
- Sought out to demonstrate that the two hemispheres were specialised for certain functions and could perform tasks independently of one another
- Normally, the hemispheres are connected by the corpus callosum and a few other structures
- A commissurotomy is an operation to cut the corpus callosum and is sometimes performed to control epileptic seizures
- Normally, the hemispheres are connected by the corpus callosum and a few other structures
- Sought out to demonstrate that the two hemispheres were specialised for certain functions and could perform tasks independently of one another
- Sample
- Epileptics who had the operation
- Procedure
- Image or word is projected to a patient's RVF (LH) and another image to the LVF (RH)
- In the normal brain, the corpus callosum 'shares' information between the hemispheres
- In the split barin, the information can't be conveyed from the chosen hemishere to the other
- Image or word is projected to a patient's RVF (LH) and another image to the LVF (RH)
- Patients' describing what is shown on the screen
- RVF
- Easily describe
- LVF
- "There's nothing there"
- RVF
- Patients' recognition by touch
- LVF
- Could not name them but could select a matching object using left hand
- Left hand could also select an object that was associated with image presented to the LVF
- Evaluation
- Shows lateralised brain functions
- Generalisation of Sperry's work
- Differences in hemispheric functions may be overstated
- Composite words and matching faces
- Words
- Two words presented on either side of the visual field
- E.g. 'Key' on the left and 'Ring' to the right
- Writes 'key' with left hand (goes to RH)
- Says the word 'ring' (goes to LH)
- Two words presented on either side of the visual field
- Faces
- 2 different halves of a face (one to each hemisphere)
- LH dominated the verbal description
- RH dominated the selection of a matching picture
- Words
- Hemispheric Lateralisation
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