def spmt(t):
return spm_hrf_compat(t, normalize=True)<EOL>
SPM canonical HRF, HRF values for time values `t`

    This is the canonical HRF function as used in SPM. It
    has the following defaults:
                                                defaults
                                                (seconds)
    delay of response (relative to onset)         6
    delay of undershoot (relative to onset)      16
    dispersion of response                        1
    dispersion of undershoot                      1
    ratio of response to undershoot               6
    onset (seconds)                               0
    length of kernel (seconds)                   32