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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/17188

Title: Near-infrared Spectroscopy as an Access Channel: Prefrontal Cortex Inhibition During an Auditory Go-no-go Task
Authors: Ko, Linda
Advisor: Chau, Tom
Department: Biomedical Engineering
Keywords: Near-infrared Spectroscopy
access pathway
access channel
brain-computer interface
Go-No-Go Task
Prefrontal Cortex
Change-point Detection
access technology
Issue Date: 24-Feb-2009
Abstract: The purpose of this thesis was to explore the potential of near-infrared spectroscopy (NIRS) as an access channel by establishing reliable signal detection to verify the existence of signal differences associated with changes in activity. This thesis focused on using NIRS to measure brain activity from the prefrontal cortex during an auditory Go-No-Go task. A singular spectrum analysis change-point detection algorithm was applied to identify transition points where the NIRS signal properties varied from previous data points in the signal, indicating a change in brain activity. With this algorithm, latency values for change-points detected ranged from 6.44 s to 9.34 s. The averaged positive predictive values over all runs were modest (from 49.41% to 67.73%), with the corresponding negative predictive values being generally higher (48.66% to 78.80%). However, positive and negative predictive values up to 97.22% and 95.14%, respectively, were achieved for individual runs. No hemispheric differences were found.
URI: http://hdl.handle.net/1807/17188
Appears in Collections:Master
Institute of Biomaterials and Biomedical Engineering - Master theses

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