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Flourens and Lashley
Transcript of Flourens and Lashley
Flourens and Lashley Jean Pierre Flourens Equipotentiality Karl Spencer Lashley Lashley's Two Generalizations Founder of experimental brain science
Involved in both neuropsychology and behaviorism
Certain parts of the brain had separate functions, each of these areas functioned globally as a whole ("equipotential")
Failed to localize memory in a rat's brain
Looked at sense receptors and motor activities
1. The brain is plastic. If one area is damaged/removed, another region can take over the damaged region’s function. (equipotentiality)
2. “Mass action” – cerebral cortex acts as one - as a whole – in many types of learning 1825 – carried out localized lesions of brain on rabbits/pigeons and observing behavior Found certain parts had certain functions
Cerebellum - affected the animal's equilibrium and motor coordination
Destruction of the brainstem (medulla oblongata) caused death
Cerebral cortex - higher mental functions
COULD NOT LOCALIZE MEMORY/COGNITION
10% Lashley's Study
Trained rats to perform specific tasks, like mazes and visual discriminations
Surgically removed varying parts and amounts of cerebral cortex
Effects on acquisition and retention of knowledge
NO effect on rat's performance Limitations Animal research is not always generalizable to humans
Exceptions to Lashley's generalizations
Showed that if part of the brain was removed, other parts COULD NOT take over Limitations to Study Rats were not tested on more complicated paradigms
Parts of the cerebral cortex can be used for different functions other than mazes and such
Data can't be extrapolated to ALL parts of the brain
Lashley only looked at the cerebral cortex