Table 2.

Statistical groupings of latency differences between the various cone mechanisms

Mechanism Isolated	ON Response	OFF Response
UV + S	(UV, S, L) (M)	(UV, S, M) (L)
M	(UV, S, M) (L)	(S) UV, M (L)
M + L	(UV, M) S (L)	(UV, S, M, L)
L	(UV, S, L) (M)	(UV, S) (M, L)

Significant difference present only between mechanisms enclosed in different sets of parentheses. No significant difference within sets of parentheses or between groups in parentheses and mechanism not enclosed in parentheses. λs of mechanisms analyzed: UV, 380 nm; S, 420 nm; M, 520 nm; and L, 630 nm. Adapted, with permission, from Beaudet (1997).