Measurements of the spectral modulation sensitivity function for two normal observers with CRT monitors

We have measured the sensitivity of the human visual system to chromatic stimuli of single chromatic frequency, ranging from 0.2 to , and for eight initial phases from to . The optimal phase curves obtained for two observers show a CSF-type shape, with minima at certain frequencies which did not appear in previous computational predictions. The implications of a value of the cut-off frequency of somewhat less than are also discussed.