Hemisphere disconnection and unity in consciousness.

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Presentation transcript:

Hemisphere disconnection and unity in consciousness. Sperry (1968) Hemisphere disconnection and unity in consciousness.

Lateralisation of Function LHS RHS (Language) LH RH (drawing) LVF RVF

Lateralisation of Function LEFT BRAIN FUNCTIONS uses logic detail oriented facts rule words and language present and past math and science can comprehend knowing acknowledges order/pattern perception knows object name reality based forms strategies practical safe RIGHT BRAIN FUNCTIONS uses feeling "big picture" oriented imagination rules symbols and images present and future philosophy & religion can "get it" (i.e. meaning) believing appreciates spatial perception knows object function fantasy based presents possibilities impetuous risk taking

Can you draw (with your left hand) what you saw? RVF LVF Can you draw (with your left hand) what you saw? Left Hemisphere Right Hemisphere What did you see? ? ? ? ? ? ? ?

Can you draw (with your right hand) what you saw? RVF LVF Can you draw (with your right hand) what you saw? Left Hemisphere Right Hemisphere What did you see? ? ? ? ? ? ?

Draw (with your left hand) what you saw. $ ? RVF LVF Draw (with your left hand) what you saw. Left Hemisphere Right Hemisphere What did you see? A question mark $

Participants 11 ‘split-brain’ patients who had undergone hemisphere disconnection because they had a history of advanced epilepsy – comparison groups of ‘normal’ people. Independent Variable – not manipulated Hemisphere disconnection (or not). Dependent Variable Performance on visual and tactile task. Quasi-experiment (no control over IV) Visual (t-scope) - Tactile (touchy-feely) - Case Study

Key Terms Hemisphere Corpus callosum Tactile task Lateralisation of function Quasi-experiment Case study Tactile task Visual task Visual Field