Speech Perception

  1. 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
  2. Subcortical Processing
    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
  3. Cortical Processing
    Auditory information from thalamus projects to the ______ (areas __&__) and is then transmitted to ________ (area __) which is responsible for comprehension.
    • primary auditory cortex
    • 41 & 42
    • Wernicke's 
    • 22
  4. 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
  5. 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)
Card Set
Speech Perception
Brief description of the neural bases of speech perception