Tilt discrimination display in which subjects discriminated whether both lines were tilted to the right or left (shown) of vertical. b Odd-element display in which subjects determined whether or not an odd-element was present. An odd-element is shown in the right bottom circle. Circles, which do not appear in the actual stimulus display, designate the four possible locations in which an odd-element may appear. c Schematic of a trial with TMS
Subjects began each trial by fixating on a fixation point which
appeared for 1500 ms (Fig. 1 c).
Single pulse TMS was delivered in randomly selected trials at
randomly selected delays measured from the onset of the visual
stimulus (Fig. 1 c) to posterior occipital cortex by a
Cadwell MES-10 magnetic stimulator through a 7 cm diameter
We used a tilt discrimination task for this purpose, in which
subjects decided if two foveally-presented, parallel black lines
appearing within a white square were tilted to the right or left of
vertical (Fig. 1 a).
In our version of this task a 5×5 array of black lines was
presented within a 3°×3° white square in the center of a black
computer screen (Fig. 1 b).
In trials containing an odd-element, it was randomly located in one
of four oblique locations, one in each visual field quadrant
(Fig. 1 b).
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