Research Focused Lecture language Flashcards
What evidence is there for the localisation of language?
Lesion studies:
- damage to left hemisphere causes language deficits
- 95% of right handlers have left-lateraled language.
- 78% of left handers have left-lateralised language (more bilaterally language)
-Language deficits and RHS motor control problems are commonly associated
What methods have been used to gather evidence on language localisation?
Brain lesions
Electrical brain stimulation
Brain imaging
Electrophysiology
Outline the case study Paul Broca investigated
- Patient name: Leborgne:
- almost mute (tantan) but understood all that was said to him
- After 10 years: paralysed in the right arm, then in the right leg; intellectual functioning affected
- findings: post morgen examinations conducted and lesion in the frontal lobe in the left hemisphere was found
What is brocas function hypothesis?
-Broca’s Aphasia Is a result of damage to third convolution of the frontal lobe
- Patients will only have the ability to speak haltingly
- they will miss many function words
- abbreviated syntax
- they will have good speech comprehension but not perfect
- There are two types ‘Non fluent’ or ‘expressive’
What is Agraphia?
- Have difficulty handwriting and patients with brocas aphasia usually suffer from it
- feeds motor cortex for speech/writing
What werincke find?
Investigated 2 patients with difficulties in understanding spoken language
- caused by damage to the superior temporal gurus in the left hemisphere
- A.K.A wernickes aphasia:
- have trouble understanding language, good speech production but little meaning A.K.A fluent aphasia
-some patients have trouble monitoring their speech and cannot repeat sentences which is also known as conduction aphasia
What allows communication between wernickes and Broca’s area to a aid speech perception?
Arcuate fasciculus
