split brain research and hemispheric lateralisation ao1

Question 1

left hemisphere

Answer 1

language processing
broca and wernikes area
rational logica problem solving

Question 2

right hemisphere

Answer 2

spatial facial and emotional recognition
recognising emotions in others
left visual field processing by your right hemisphere

Question 3

who and did case study to supoort right hemisphere fuction

Answer 3

heller and levy 1981

Question 4

heller and levy 1981

Answer 4

studied reognition of emotions of othes
if a photo of a face has been split so that one half is smiling and other is neutral - the emotion displayed on the left side of the picture is the emotion recognised by the ppt
the left visual field has stated the left side is neutral - controlled by right hemisphere due to contralateralisation

Question 5

Who studied lateralisation of the brain

Answer 5

Sperry

Question 6

What connects right and left hemisphere

Answer 6

Corpus Callosum

Question 7

All of sperrys patients have

Answer 7

Epilepsy

Question 8

Purpose of corpus callous 1940

Answer 8

Was to hold hempipsheres of brain together

Question 9

Left visual field is …
And is controlled by …

Answer 9

Left side of both eyes
Right hemisphere

Question 10

Right visual field is …
And is controlled by …

Answer 10

Right side of both eyes
Left hemisphere

Question 11

Left hand is controlled by

Answer 11

Right hemisphere

Question 12

Right hand is controlled by

Answer 12

Left hemisphere

Question 13

Who studied laterisation

Answer 13

Sperry and gazzaniga 1976

Question 14

S and G aim

Answer 14

To test the capabilities of the Seperated hemispheres by sending visual field imagery to just one hemisphere

Question 15

S and g procedure

Answer 15

Person would fixate on dot at centre if screen
Info was presented to their left or right visual field
They would then make responses with either thier right or left hand
Or verbally (controlled by left hemisphere()
They were unable to see what their hands are doing

Question 16

S and G sample
Type of experiment
DV and IV

Answer 16

All had comminssorotomy surgery to cut corpus callosum
11pateints
Quazi experiment - naturally occurring
IV - did they have a split brain or not
DV- performance in visual or tactile tasks

Question 17

Findings of s and g
Describe what you see
Recognition by touch

Answer 17

Describing what what you see:
When a picture was shown to the right visual field the patient could easily describe what was seen
If the same object was shown to the left visual field they could not and even reported that there was nothing there
Recognition by touch:
Although patients could not attach verbal labels to objects projected in the left visual field - they were able to select a matching obj from a grab bag of different object using their left hand (bc left visual field and left hand are controlled by right hemisphere can’t say it bc that’s controlled by left hemisphere)

Question 18

Findings of s and g - composite words

Answer 18

If 2 words were presented simultaneously on either side of the visual field for example key on the left and ring on the right the patient would write key with their left hand and say the word ring

Question 19

Findings of s and g - matching faces

Answer 19

The right hemisphere also appperaed dominant in terms of recognising faces
When asked to match a face from a series of other faces
The picture processed by the right hemisphere was consistently selected
This is bc R hem is responsible for facial and emotional recognition

Question 20

Split brain patients show unusual behaviour when tested in expiriments
Briefly explain how unusual behaviour in split brain patients could be tested in an experiment (2)

Answer 20

Ask patients to look at dot on a screen and flash an image to their right visual field then ask them ti say what they saw
Then flash an image to their left visual field and ask them to say it

Question 21

Outline findings of sperry and Gaza split bran research

Answer 21

When a picture of an object was shown to ppts RVF linked to LH they were able to describe what was seen
When ppts had image shown to LVF linked to RH they reported that there was nothing there
This is bc in a connected brain messaged from right hemisphere are relayed to language centres in left this isn’t possible in split brain
Although ppts couldn’t give verbal labels to objects linked to LVF they could select a matching object out of sight using their left hand which is linked to right hemisphere
The left hand was also able to select object most closely related with object presented to left visual field
If a pic was shown to LVF their was an emotional reaction eg giggle but reported seeing flash of light

Question 22

Conclusions of sperrys split brain research

Answer 22

These obeservations show that certain functions are lateralised in the brain and support the veins tht LH IS verbal RH is silent yet emotional

Question 23

Ao1 Karen Bryne case study

Answer 23

Karen had surgery to cut her corpus callosum
The side effect of which demonstrated how the 2 hemispheres work independently in a real world example
She suffers from alien hand syndrome
She describes behaviour where she would light a cigarette and the left hand would stubb it out, or her right hand would do up the buttons of her shirt only for her left hand to unbutton them
This suggests that both hemispheres work independently and may have their own consciousness