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¥ Solving a
visually presented puzzle:
a) subject sees puzzle
b) subject
cogitates a while
c) subject
responds with solution
¥ The problem
is that we expect some voxels to be significant in phase (b) as well as phases (a) and/or (c)
¥ Variable
length of phase (b) means that shape for its response varies between trials
HWhich is contrary to the whole idea of averaging trials together to get decent statistics (which is basically what linear regression amounts to, in a fancy sort of way)
¥ Could
assume response amplitude in phase (b) is constant across trials, and response duration varies directly with time between phases
(a) and (c)
HNeed three HRFs; phase (b)Õs is a little tricky to
generate using waver, but it could be done
Even
More Complicated Case
timing of
events
is
measured