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PLAN Outline and evaluate hemispheric lateralisation and split brain research £2.99   Add to cart

Essay

PLAN Outline and evaluate hemispheric lateralisation and split brain research

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Plan for a full mark biopsychology essay.

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  • April 3, 2019
  • 1
  • 2017/2018
  • Essay
  • Unknown
  • A*
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scienceandpsych
Outline and evaluate hemispheric lateralisation and split brain research. (16 marks)

Outline:

 Each hemisphere is functionally different
 Certain mental processes and behaviours mainly controlled by one hemisphere
 Communicated through corpus callosum, allows perform tasks requiring both

 Demonstrated by Sperry, corpus callosums removed to control epileptic seizures
 Central fixation point, image one-tenth
 Present to right visual field processed by left hemisphere and vice versa
 Could describe images on the right, not left, language lateralised in left hemisphere
 Images right drawn with right hand, left with left hand

Evaluation:

 P: lacks internal validity, causal connections cannot be drawn
 E: Sperry’s control group no epilepsy, differed in two ways from experimental group
 A: differences due to lack of communication between hemispheres, neural changes due to
seizures or epilepsy medicines
 L: only 11 studied, cannot be generalised universally

 P: makes evolutionary sense
 E: enhances multitasking, adaptive for humans in EEA
 A: Rogers, lateralisation in chickens, find food and watch for predators simultaneously
 L: valuable for neural processing capacity

 P: limited, not as fixed as once predicted
 E: plasticity can allow behaviours performed by one hemisphere to be performed by other
 A: JW learned to describe stimuli on left
 E: recovery from hemispherectomy for Rasmussen’s syndrome, plasticity effective
 L: lateralisation explains some differences in brain functioning, advancements in technology
(PET) allow research into plasticity, only partial explanation

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