Figure 3
Test set-up. (a) The fMRI response as an LTI signal: HRF (i), stimulus pattern (ii), and the activation signal (iii) as (i) convolved with (ii). (b) In the GLM, confounds such as trends (ii) and noise (iii) are added to the response (i). (c) The total response: activation signal + confounds + noise. (d) The ForWaRD-reconstructed HRF (i) compared to the original (ii). (e) The activation signal using the extracted (i) and original (ii) HRF. (f) The canonical HRF, HRFspm, see Eq. (6).