### Figure 8

Top
right: Design matrix: This is an image representation of the design
matrix. Contrasts: These are the vectors of contrast weights
defining the linear compounds of parameters tested. The contrast weights are displayed over the
column of the design matrix that corresponds to the effects in question. The design matrix here includes
condition-specific effects (boxcars convolved with a hemodynamic response
function). Odd columns correspond to
stimuli shown under isochromatic conditions and even columns model responses to
isoluminant stimuli. The first two
columns are for stationary stimuli and the remaining columns are for conditions
of increasing speed. The final column is
a constant term. Top left: SPM{T}: This is a maximum intensity projection of the
SPM{T} conforming to the standard anatomical space
of Talairach and Tournoux (1988). The T
values here are the minimum T values from both contrasts, thresholded at p =
0.001 uncorrected. The most significant
conjunction is seen in left V5. Lower
panel: Plot of the condition-specific parameter estimates for this voxel. The T value was 9.25 (p<0.001 corrected -
see Figure 7.htm).