Table 2.

Psychophysical detection thresholds (in percentage cone contrast)

Subject	JL	LG	MS
(L + M)-cone
1.5 Hz	0.38 ± 0.12%	0.79 ± 0.08%	0.70 ± 0.11%
7.5 Hz	0.32 ± 0.07%	0.63 ± 0.10%	0.45 ± 0.07%
(L − M)-cone
1.5 Hz	0.15 ± 0.05%	0.21 ± 0.07%	0.13 ± 0.04%
7.5 Hz	0.42 ± 0.05%	0.40 ± 0.05%	0.45 ± 0.11%
S-cone
1.5 Hz	0.7 ± 0.1%	1.3 ± 0.2%	1.6 ± 0.2%
7.5 Hz	3.3 ± 0.4%	4.0 ± 0.5%	2.8 ± 0.3%

As temporal frequency increases from 1.5 to 7.5 Hz, thresholds increase significantly for (L − M)-cone and S-cone stimuli but remain the same or decrease for (L + M)-cone stimuli.