Lesson 7 – Lateralisation of Function Flashcards

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1
Q

What is Lateralisation of Function?

A

Lateralisation of function- idea that 2 hemispheres of 🧠 have different specialisations
- right hemisphere of 🧠 responsible for left side of body and left hemisphere responsible for right side of body (hemispheric laterisation)

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2
Q

What is the corpus callosum?

A

Corpus callosum- nerve fibres which connects the 2 hemispheres

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3
Q

What is the left hemisphere mainly responsible for?

A

Left hemisphere dominant for language (Broca and Wernicke Areas)

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4
Q

What is the right hemisphere mainly responsible for?

A

Right hemisphere dominant for recognising faces

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5
Q

What are the evaluation points of Lateralisation of Function?

A

👍- increases ⬆️ neural processing capacity- using 1 hemisphere to engage in particular task leaves other hemisphere free to engage in another function
Rogers et al. (2004)- found lateralisation in 🐓 associated with ability to perform 2 tasks simultaneously (finding food and being vigilant for predators)
👎- individual differences- JW developed capacity to speak using right hemisphere- could speak about info presented to left or right hemisphere

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6
Q

Who are split-brain patients?

A

Patients who have their corpus callosum cut in order to prevent the violent ⚡️ activity caused by epileptic seizures (neurons 🔥) crossing from 1 hemisphere to the other

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7
Q

Who investigated split brain patients and when did they do so?

A

Sperry and Gazzaniga (1968)

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8
Q

What did Sperry and Gazzaniga (1968) do?

A

1) Patients asked to stare at dot in centre of screen and then info presented in either left or right visual field.
2) Then asked to make responses with either left 🖐(right hemisphere), right 🤚 (left hemisphere) or verbally 👄(left hemisphere) without being able to 👀 what their 🖐🤚 doing
3) If flashed image of 🐕 in right visual field and asked what they saw- able to answer ‘dog’ because info gone into left hemisphere where language centres are
4) BUT if 🐈 shown in left visual field and asked what they saw- ✖️ able to say because info gone to right hemisphere- has ✖️ language centres- BUT can draw picture of 🐈 with left 🖐 because right hemisphere controls this hand

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9
Q

Why did Sperry and Gazzaniga (1968) find what they did?

A

Because investigated split-brain patients where corpus callosum been severed- … ✖️ way for info presented to 1 hemisphere to travel to other

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10
Q

What are the evaluation points of Split-Brain Research?

A

👎- findings of split-🧠 research ✖️ be generalised to 🎯 population- disconnection between hemispheres greater in some patients than in others- ALSO some patients have drug therapy for epilepsy for much longer than others- may affect way in which 🧠 works
👎- many studies using split-🧠 patients have as few as 3 pps- … hard for results to be generalised
👎- in real world severed corpus callosum compensated for by unrestricted use of both visual fields (can look 👀 around) … research lacks ecological validity

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