On Speech, Music, and Audiomotor Interactions
Green, Brannon M.
Rauschecker, Josef P
Speech and music production require repeated and accurate coordination between actions and sounds. This tightly regulated set of audiomotor interactions seems to persist for receptive speech and music perception as well. Various models for auditory processing exist that delineate how the brain processes different kinds of sounds, and roles for these auditory areas have been suggested, but they have yet to be well characterized. Similarly, as speech and music sounds are repeatedly presented they must be learned and stored somewhere, which must invariably draw upon some form of memory. Yet, memory systems have been largely absent from the models of auditory processing.This dissertation seeks to further validate the dual-stream model of auditory perception while proposing functional and anatomical additions to this model in the form of motor and memory systems. The first study uses a rapid adaptation paradigm and magnetoencephalography to investigate the location and timing of areas exhibiting categorical speech representations. Categorical tuning was found in areas of the inferior frontal gyrus, insula, and premotor strip, suggesting a role for motor areas in the categorical speech perception. The second study uses a music paradigm functional magnetic resonance imaging paradigm to investigate how the brain processes novel and familiar sequences of sounds. The basal ganglia was shown to play an early role in novel sequence encoding, while the medial temporal lobe seemed to play an intermediate role as sequences were repeatedly presented until finally eliciting activation in prefrontal areas.This work provides insight into how the human auditory and motor systems interact with each other and the canonical memory systems to form lasting auditory memories.
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