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A flashing checkerboard was presented for 1.25 seconds with ISIs
between single-events drawn at random from a Poisson distribution
with mean 8 seconds. ISI's were discarded if less than 4 seconds
or greater than 16 seconds. Half of the trials were randomly
assigned to a black and white checkerboard condition and the
others to a blue and yellow checkerboard condition. The black and
white checkerboard response was modelled as one regressor and the
colour checkerboard response was modelled as another.