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Behavioral And Neurophysiological Measures Of Speech Auditory Feedback Processing Impairment In Left Hemisphere Stroke, Stacey Sangtian
Behavioral And Neurophysiological Measures Of Speech Auditory Feedback Processing Impairment In Left Hemisphere Stroke, Stacey Sangtian
Theses and Dissertations
The purpose of this study was to identify behavioral and neural correlates of impaired speech auditory feedback processing in people with a history of left-hemisphere stroke (LHS). To do this, we used the altered auditory feedback (AAF) paradigm to externally induce speech errors by randomly shifting the pitch frequency of the online auditory feedback up or down at ±100 cents in 38 LHS and 27 neurologically intact control participants under two experimental conditions: 1) active vocalizations of a steady speech vowel sound “ah,” and 2) passive listening to the playback of the same self-produced vocalizations. Randomized control trials were included …
Neural And Behavioral Correlates Of Planning During Vocal Motor Control, Stacey Jean Sangtian
Neural And Behavioral Correlates Of Planning During Vocal Motor Control, Stacey Jean Sangtian
Theses and Dissertations
Speech is a goal-directed movement developed to serve the purpose of human communication. During speech, the brain simultaneously coordinates complex motor behavior and sensory information for planning, execution and online monitoring for error correction in order to ensure accurate delivery of the vocal messages. Models of speech production and voice motor control have adapted the principles of the internal forward model to explain that speech sound production is controlled by comparison of internal predictions with sensory feedback. Growing evidence from studies conducted in speech and limb motor movement indicate that these sensory predictions and responsive commands are loaded in anticipation …