What is Speech Perception
2 things must occur:
What does the listener do?
How do listeners deconstruct speech segments?
- Speaker provides acoustic speech signal, listener retrieves linguistic representations of the signal
- Extract meaning from speech, map acoustical signal onto linguistic representations, and break language into individual segments
- speech perception mechanisms are spread throughout the cortex, there is no single mechanism
Structures: 1, 2, 3, 4, 5, 6?
What is speech analyzed for?
- Cochlea: Nerve: Cochlear Nucleus: Superior Olivary Complex: Inferior colliculus: medial geniculate body
- location, intensity, transitions, frequency, timing (onset/termination) this is the most important for phoneme perception
Auditory information from thalamus projects to the ______ (areas __&__) and is then transmitted to ________ (area __) which is responsible for comprehension.
- primary auditory cortex
- 41 & 42
Other Speech Processing Areas
Responsible for (4):
- Prosody, intonation, timing, stress
- integrates different components of the speech signal
- involve with the timing of speech sounds
Disorders of Auditory Processing:
Central (Cortical) Deafness:
Auditory Sound Agnosia:
Pure Word Deafness:
- No awareness of auditory stimuli, but hearing mechanism is intact, bilateral damage to auditory cortex
- Unable to identify nonverbal stimuli, they are aware of them though, damage to auditory association cortex
- speech perception impaired, but speech production/reading/writing is fine, they can perceive nonverbal stimuli but cannot perceive speech stimuli, difficulty understanding speech, unilateral/bilateral damage to auditory cortex, subcortical lesion of connections to Wernicke's
- similar to prosopagnosia in that individuals have issues recognizing familiar voices, damage to inferior parietal lobe (right hemisphere)