Cerebral Cortex, Vol 7, 690-701, Copyright © 1997 by Oxford University Press
S Van Oostende, S Sunaert, P Van Hecke, G Marchal and GA Orban
We used functional magnetic resonance imaging to explore, in individual
subjects, the properties of the kinetic occipital (KO) region, which
previous position emission tomography studies have shown to be involved in
the processing of kinetic boundaries. The KO region was significantly
activated in 23/25 subjects tested in the subtraction of uniform motion
from kinetic gratings. The KO region is genuinely specialized for
processing kinetic boundaries since it is significantly more activated by
kinetic gratings than by luminance-defined gratings, uniform motion or
transparent motion. This leaves only the kinetic boundaries, created by
discontinuities in motion direction, as the specific stimulus aspect,
activating the KO region. The KO region is anatomically and functionally
distinct from areas MT/V5, V3 and V3A. It also has minimal overlap with the
lateral occipital (LO) region. The selective activation of the KO region is
robust and relatively immune to changes in stimulus size, spatial frequency
and type of kinetic boundary. These results strongly argue for the view
that the KO region is a new, separate, functional region in human occipital
cortex.
ARTICLES
The kinetic occipital (KO) region in man: an fMRI study
Dienst Radiologie, Universitair Ziekenhuis Gasthuisberg, Leuven, Belgium.
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