Abstract
The stimuli used in the fMRI studies were rotating wedges (a) expanding rings (b) consisting of flickering checkerboard patterns (2Hz rate),a full field flickering checkerboard stimulus (not shown), and coherence which was a random dot kinematogram display (c) where a proportion of the dots moved radially in expanding or contracting motion while the remainder dots provided masking motion noise. These first three stimuli allowed us to map the retinotopic visual areas and the Motion Coherence task localized the MT+ cortical region, an area known to be especially involved in processing visual motion (6,7,8). All tasks were performed with central fixation and in both, observers fixated the center of the screen. For the retinotopic mapping subjects were asked to perform a fixation discrimination task (press a key on a magnet compatible keypad every time the fixation changed luminance). In the Motion Coherence task subjects discriminated direction in the radial pattern motion stimulus. Aims
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