Table 1.

Psychophysical performance for RT and FD experiments

MonkeyαRT Mean ± SEMβRT Mean ± SEMnαFD Mean ± SEMβFD Mean ± SEMnαRTFD
N6.82  ± 0.491.45  ± 0.09319.11  ± 0.851.65  ± 0.17250.77
B7.97  ± 0.471.62  ± 0.102310.92  ± 1.001.66  ± 0.18130.69
  • Average values of threshold (α) and slope (β) from Equation 1(mean ± SEM, based on n experiments) are shown for each monkey. The ratio, αRTFD, is derived from experiments in which data were obtained for both RT and FD conditions. For both monkeys, the geometric mean of αRTFD was <1 (p = 0.002; paired t test after log transform).