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Hemispheric lateralisation
Certain mental processes and behaviours are controlled or dominated by one hemisphere rathee than the other e.g language.
Split-brain studies
Corpus callosum cut in patients with severe epilepsy, allowing researchers to investigate the extent to which brain function is lateralised.
Who conducted split brain research
Sperry
Procedures of split brain studies
Images/words are projected to the right/left visual field. (R/LVF)
Describing what you see (split brain)
Pictures shown to RVF could be described but not those to LVF as the language centres in the left hemisphere aren't connected to the LVF
Recognition by touch
Couldn't describe object projected to LVF, but able to select a matching object using their left hand.
Language abilities of the right hemisphere
Right hemisphere could understand words written on the screen (solved problem by left hand) but can't speak to answer, it shows that it has basic language abilities.
Low external validity
can't generalise the conclusions to the rest of the population. (small sample size, 11, all were epileptic). low population validity
the task is very unrealistic. low ecological validity
Replicability
The tasks are easy to replicate due to highly controlled variables due to it being a lab experiment, increasing reliability.
Low internal validity
some participants had drug therapy much longer than others
disconnection between hemispheres was much greater in some patients than others
epilepsy couldve been a confounding variable (all participants had epilepsy) therefore comparison groups were invalid
