Cortical asymmetry Flashcards
Function of Broca’s area
Vocalisation of speech
Where is the opercular cortex located?
Upper and lower lips of the lateral fissure
Which hemisphere is opercular cortex thicker in?
Left
Where is Wernicke’s area located?
Acortical area at end of superior temporal gyrus is temporal lobe
Function of Wernicke’s area?
Decoding what you hear into meaningful words
What would you see in Broca’s expressive aphasia?
halting speech, repetitive, disordered grammar, syntax and word order. Sense behind the words
What would you see in Wernicke’s receptive aphasia?
Fluent speech, no repetition, good syntax, good grammar. Words are meaningless
How are Broca’s area and Wernicke’s are connected?
Joined by bundle of cortico-cortical association fibres called the arcuate fasciculus
Result of damage of arcuate fasciculus
Conduction aphasia
Symptoms of conduction aphaso?
Impaired ability to repeat back heard or written words. Word finding difficulties
How to Broca’s and Wernicke’s work together to produce speech?
Sounds decoded into perceived words in Wernickes
Surround parietal and superior temporal process meaning of words
Concepts of words we speak formed in Wernicke’s area
Conducted via arcuate fasciculus to Broca’s
Converted to gramatical sentences which are sent to motor cortex of mouth lips and tongue
What supplies Broca’s and Wernickes
Middle cerebral
What % of people have left hemisphere language specialisation
70-95
Role of the right side of brain corresponding to Broca’s and Wernickes
Non-semantic speech recognition and generation (intonation, rhythm and emphasis)
Lesion of right hemisphere regions leads to…
aprosodia: monotonous speech
