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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Effects of Delayed Auditory Feedback on the Bereitschaftspotential

Johnson, Jennifer L. 19 November 2007 (has links) (PDF)
This study examined the brain electrical activity of normal speakers in a non-delayed auditory feedback (DAF) condition and when experiencing DAF to determine the effect DAF would have on the Bereitschaftspotential (BP). The BP reflects the preparatory state of a person prior to motor execution of an act and can be observed 1500 to 500 ms prior to voluntary movement. The participants in the study included 10 adults with normal speech. Each read a series of 30 sentences, both without DAF and with DAF, while the BP was measured. Results indicate that the BP is present across the scalp in both the control condition and the DAF condition; however, the BP is reduced in the DAF condition. The scalp distribution maps indicate an increased negativity in the left frontal lobe in the DAF condition. These findings suggest that while the brain is engaged in processing current information that has already been initiated, the motor system may not be able to be primed for the next sequential motor event. There is still a need for more research to explore the motor control of speech and the ways altered feedback may disrupt the speech motor control.

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