Table 4.

Log uncertainty (M/K) for both cones and rods. Uncertainty was estimated by fitting threshold data with a detection model incorporating uncertainty, described by Equations 5-7. Subject 5's uncertainty could not be reliably estimated due to a low false positive rate. Cone and rod values reported for subject 1 are the mean and standard deviation across 6 and 4 data sets, respectively. Rod values reported for subject 4 are the mean and range for 2 data sets. Uncertainty (M/K) is significantly higher for cone detection than for rod detection on average (p = 0.03). Since these estimates were obtained assuming independent detection across stimulus relevant and irrelevant channels without late additive noise, they represent the minimum uncertainty consistent with subject's detection data given linear transduction.

	Log M/K
	Cones	Rods
Subject 1	4.13 ± 2.78	1.13 ± 1.16
Subject 2	6.50	2.25
Subject 3	7.00	n/a
Subject 4	2.25	2.13 (1.26 – 3.00)
Subject 6	n/a	2.00