Hi Srikanth,

Note that 3dDeconvolve has the GAM basis function, so waver
does not need to factor into your thinking.

Your question is on the difference between GAM and BLOCK(1,1).
GAM is a more compact curve, lasting for about 12 seconds,
while BLOCK is wider, lasting 15.

To compare the curves, use 3dDeconvolve with a stimulus at
time 0 for each type, and then plot the resulting X-matrix:

------------------------------------
3dDeconvolve -nodata 20 1 -polort -1 -num_stimts 2 \
-stim_times 1 '1D: 0' GAM \
-stim_times 2 '1D: 0' 'BLOCK(1,1)' \
-x1D X.xmat.1D -x1D_stop

1dplot X.xmat.1D
------------------------------------

For a 1 second stimulus, I would be inclined to use GAM.
Beyond that, probably BLOCK. Either is probably reasonable
in your case, and the results should not be very different.

- rick