Hemispheric Lateralisation - Evaluation - Flashcards in A Level and IB Psychology

Brain Lateralisation (Strength - neural processing capacity)

Increases as leaves one hemisphere free to engage in another task e.g. left language and speech, right visuospatial tasks at same time

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Brain Lateralisation (Rogers et al, 2004)

Chickens. Found BL associated w/ enhanced ability to perform 2 tasks at same time e.g. ability to find food but also remains alert for predators. Proves it works, but does not support that it provides efficiency in conducting cognitive tasks.

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Brain Lateralisation (Tonnessen et all, 1993)

Found a relationship between people being left handed and having an immune system problem. Suggests process leading to lateralisation on a genetic level may also affect immune system

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Brain Lateralisation (Morfit and Weekes, 2001)

Supports Tonnessen et all (1993). Found higher rates of immune disorders in left handed people and their immediate families when comparing right handed people

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Brain Lateralisation (Weakness - changes with age)

Some research suggests lateralisation of function changes w/ age and doesn't remain localised throughout life. Localised patterns observed in younger people appear to become bilateral across both hemispheres as people become older

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Brain Lateralisation (Weakness - changes with age, Szaflarski, 2006)

Found language being localised to left hemisphere decreased w/ each decade of life after 25. Possible explanation for this is we begin to rely on right hemisphere more for extra processing as compensation for age-related decline in functioning

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Split-Brain (Weakness - been undermined)

As other case studies have emerged of people being able to conduct tasks which should not be possible according to earlier findings. e.g. SBR suggests right hemisphere unable to handle language, but case studies shown not necessarily true

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Split-Brain (Weakness - been undermined, case study, Turk et all, 2002)

Involving patient known as J>W found to be able to show language ability from the right hemisphere and speak about info presented to him for either side of the brain

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Split-Brain (Weakness - procedure to cut the corpus callosum rarely conducted anymore)

Means finding sufficient patients to study and generalise the finding beyond these isolated case studies is difficult

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Split-Brain (Weakness - procedure to cut the corpus callosum rarely conducted anymore, Andrews, 2001)

Argued conclusions drawn from individuals who've had their CC cut previously for SBR have usually had another physical disorder which may have a confounding variable/less complete sectioning of hemispheres than believed - results may be invalid

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Hemispheric Lateralisation - Evaluation

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