¥ The fixed-TR stick function approach doesnÕt fit with
arbitrary timing of stimuli
H When subject actions/reactions are
self-initiated, timing of activations cannot be
controlled
¥ If you want to do deconvolution, then must adopt a different basis function expansion
approach
H One that has a finite number of
parameters but also allows for calculation of h(t ) at
any arbitrary point in time
¥ Simplest set of such functions are closely related to stick functions: tent functions