The name is absent

26

by eye movements would not contaminate the activations measured in hand and foot
trials. The visual display, including the target, remained constant at all times. With the
exception of catch trials, subjects were not required to make any overt or covert
behavioral responses.

Behavioralresponsecollection

In all experiments, an MR-CdmpatibIe eye-tracking system (Applied Science
Laboratories, Bedford, MA) was used to monitor the subjects' behavioral state and
record behavioral responses. A brief training session and calibration of the eye tracker
was performed before the start of scanning, and recalibration was performed as needed
throughout the scanning session. A window was created around the visual target with a
100 pixel margin, and a response was scored if the subject's eye position entered this
response window at any time during a trial. On average, there was less than one false
alarm and less than one miss in each 5 min scan series. Across subjects, the average
saccadic reaction time during catch trials was 573 ± 118 (SD) ms.

Results

TolocalizeareaMTandMsT_zBoLDfMRrwasusedtomeasurebrainactivityas
subjects viewed moving random dots presented in the left or right visual field (Huk, et
al. 2002). Visual motion responsive voxels were mapped to inflated cortical surface
models (Fig. 1A). Within motion-responsive cortex, MST was identified as the area in the
ascending limb of the posterior inferior temporal sulcus that responded strongly to

<<   34   35   36   37   38   39   40   >>

More intriguing information