code: def spmt(t):
      """SPM canonical HRF, HRF values for time values `t`
  
      This is the canonical HRF function as used in SPM
      """
      return spm_hrf_compat(t, normalize=False) / _spm_can_int
  
file_path: nipy/nipy/modalities/fmri/hrf.py
imports: from functools import partial
  import numpy
  import scipy.stats
  import sympy
  from sympy.utilities.lambdify import implemented_function
  from .utils import T, lambdify_t
label_desc: Use image node_id 6 for calling a global function with example usage: spmt(t) and returns: unknown