The nonlinearity investigation between stimulation duration and HRFs in primary visual cortex
Date Issued
2008
Date
2008
Author(s)
Chang, Ju-Yin
Abstract
Hemodynamic responses to visual stimulation were assessed for nonlinearity in short stimulation duration. Four stimulation durations were used (1, 2, 4, and 8 sec), and 9 subjects were scanned to verify the nonlinear BOLD responses in visual cortex. The test of nonlinearity consisted of using BOLD responses due to short stimulation durations to predict responses due to long stimulation durations. The results show the hemodynamic response is nonlinear for stimulation duration less than 4 sec in the visual cortex. In addition, the shape of hemodynamic response function influenced by the choice of region-of-interest was discussed.
Subjects
BOLD fMRI
Linearity
stimulation duration
visual cortex
region-of-interest
Type
thesis
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ntu-97-R95921047-1.pdf
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