Control Of Cerebral Speech Flashcards
What are the 4 main stages of speech production
Conceptualism
Formulation
Articulation
Self monitoring
Conceptualism
Decide what to say
Formulation
Select appropriate words and organise in grammatical form
Articulation
Plan, co ordinate and initiate movement to produce speech
Self monitoring
Auditory and somatosensory feedback for correction
What is the left hemisphere specialised for
Phonetic, word and sentence processing
Left hemisphere
activated not only by auditory signals but by visual lights with linguistic significance
Broca’s area
-early recognition of dominance of left brain hemisphere in speech and language production
-3rd convulsion of the inferior gyrus of the frontal lobe
Broca’s aphasia
Brocas aphasia: non fluent & agramattic verbal output, effortful &halting speech. Problems with articulation, word finding, repetition, production, and comprehension of complex sentences.
Wernickes area
- Surrounds the posterior part of the lateral fissure, located at the junction of the parietal, temporal and occipital lobes.
- Part of neural system that processes speech sounds and associates sounds with concepts.
UNDERSTANDING LANGUAGE
Wernickes aphasia
Wernicke aphasisa- fluent speech, produced at a normal rate but ‘empty’. Speech content is unintelligible due to frequent errors in word choice/retreiaal. Poor comprehension of language hence no awareness of errors
Wernickes model
Visual cortex
Receives written words as visual stimulation
Wernickes model
Angular gyrus
Transforms visual representations into an auditory code
Wernickes model
Motor cortex
Word is pronounced
Respiratory system
- Movement of air in and out of lungs
- Diaphragm, external intercostal and scissors muscles.