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== Visual Contrast Response Function Program ==
attachment:VisualResponseContrast

Participants view varying levels of contrast in sine wave gratings presented as dynamic moving images surrounding a central fixation target spotting task (spot a target in a continuous stream of letters). 

attachment:DISC_X.png

== Parameters ==
A block design is used to allow for maximal HRF values and return to baseline. 
Alternate runs of the constant stimulus and adaptive procedure. 

4 epis (2 constant and 2 adaptive runs at 2.5 and 6.5 each) 
Measurements: 780[[BR]]
TR 1 [[BR]]
16 slices [[BR]]
V1 ROI [[BR]]