Lateralisation and split brain research Flashcards
What does lateralization mean
It refers to when 2 halves of the brain which aren’t a like
What is the name of the structure which transfers info between the two halves of the brain
The corpus-callosum
TRUE or FALSE
Does each side of the brain have the same function
FALSE
each side has its own associated function
LEFT HEMISPHERE: what side does it receive info and visual info from
THE RIGHT SIDE
LEFT HEMISPHERE: what does this half of the brain control for
Speech
Language
Comprehension
Analysis + calculations
Time and sequencing
Recognition of words and letters and numbers
RIGHT HEMISPHERE: what side does it receive info and visual info from
THE LEFT SIDE
RIGHT HEMISPHERE: what does it control
Creativity
Spatial ability
Context perception
Recognition of faces, places and objects
How does sensory stimuli from the right visual field enter the brain
Sensory stimuli from the right visual field is seen with BOTH eyeballs however it is processed in the LEFT hemisphere
How does sensory stimuli in the left visual field enter the brain
Sensory stimuli from the right visual field is seen with BOTH eyeballs however it is processed in the RIGHT hemisphere
What was one treatment to prevent epilepsy to do with the brain
Severe the corpus callosum
What was the reasoning for severing the corpus callosum
Splitting the corpus callosum breaks communication line being broken, researchers have seen to what extent the hemisphere can work independently
Who created split brain research
SPERRY
Who created split brain research
SPERRY
What was the aim of Sperrys split brain research
To investigate the abilities of those with split brains
What was the procedure of Sperrys research
An image or word is projected to p.t’s right visual field and the same or different image was projected to left visual field — in a normal brain this info would be shared however, due to split brain there’s a difference
11 p.t w/ split brain with history of advanced epilepsy
•p.t stare at a point in The middle then complete a series of tasks
• describing
• recognizing by touch
• composite words
• matching faces
Compared the split brain results with normal brains
What did Sperry find when researching split brains in each task
Describing what you see: when shown in right visual field people can describe it due to language being in the left hemisphere, however if same image is shown in left visual field p.t can’t describe it
Recognition by touch: when shown image in left visual field p.t could select the image by touch with left hand — this is true for right VF and right hand
Composite words: 2 words presented, one in left VF one in right VF — the p.t would be able to say the word in the right VF and draw the word in left VF with left hand
Matching faces: when presented with faces in both visual fields, p.t were quicker to match the face presented in the left VF processed by the right hemisphere and other image ignored
What was the conclusion of split brain research
Clear differences between split brain p.t however it’s apparent that the diff hemispheres have diff functions to one another however generally all processing requires both hemispheres
What is a strength of split brain research
P: Sperrys research was standardized procedure
E: Sperrys method of presenting visual info to one hemispheric field at a time using a fixation point
E: an image would then be projected for approx. 1/10 of a sec meaning there isn’t enough time to move their eye to spread info across both hemispheres
L: This allowed sperry to vary aspects of the basic procedure and ensured that only one hemisphere was receiving info at a time
What is a limitation of split brain research
P: split brain patients are a unique sample
E: e.g only 11 who took part in all variation of the basic procedure who all had advanced epilepsy
E:it has been argued that this may have caused unique changes in the brain that could’ve influenced the findings
L: therefore it’s hard to generalize results
What is a limitation of split brain research
P: split brain patients are a unique sample
E: e.g only 11 who took part in all variation of the basic procedure who all had advanced epilepsy
E:it has been argued that this may have caused unique changes in the brain that could’ve influenced the findings
L: therefore it’s hard to generalize results
