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How do we investigate the brain?
Brain damaged patients (unilateral, split-brain), neuroimaging, perceptual assymetries
first to tie function with anatomy, leading to assumption that left was the most important and intelligent side of the brain
Damage to the left side of the brain leads to problems with the right side of the body
Localised spatial awareness to the right hemisphere - also that it had a role in language
Right hemisphere damage leads to
Aprosodia, loss of meaning, Amusia, loss of spatial awareness, Hemispatial neglect, prosopagnosia, euphoria, anosognosia
Wada test - what
Inject sodium amytal (amobarbital) into middle cerebral artery on left or right side
How do patients have split brains? - why
Callosum cut (to control epileptic seizures), but subcortically still intact
What is learnt from split-brain patients?
LH - speech production, RH - language abilities (reading of concrete words, auditory, skips to meanings), visual-spatial abilities
Functional Magnetic Resistance Imaging, detect changing aspects of brain physiology without radiation, gives 3D image or brain at work showing active parts
Electroencephalography, detects electrical currents from neurons, by affixing electrods to the head, indiates activity at brain's surface
Positron emission tomography, 3D localisation of brain function, injecting with radioactive sugar absorbed by brain cells according to level or activity
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