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Abstract:
Evidence from patient studies suggest separate object- and
space-based attentional mechanisms (Egly et al., 1994a, b; Behrmann
& Tipper, 1999). These attentional mechanisms are associated
with lateralized cortical function: object-based attention
predominantly controlled by the left hemisphere and space-based
attention predominantly controlled by the right hemisphere (Egly et
al., 1994b). In our experiment, we use the standard Egly et al.
paradigm comparing shifts of attention within objects to shifts of
attention between objects. To date, there has been no investigation
of the neural substrates of these two mechanisms in
neurologically-intact participants. Using functional magnetic
resonance imaging and event-related methods with normal
participants, we characterize distinct patterns of neural activity
associated with these attentional mechanisms.
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