Table 1.

C₅₀ analysis

Neuron type	Number	SacIn versus NoSac
		<	>
Total	79	21 (26.6)	2 (2.5)
Buildup	31	9 (29.0)	1 (3.2)
Visual motor	30	6 (20.0)	1 (3.3)
Visual tonic	11	5 (45.5)	0 (0)
Visual phasic	7	1 (14.3)	0 (0)

Changes in C₅₀ with a cue to make a saccade. The total number of SC neurons is shown in the column titled Number. The numbers of neurons with a reduced C₅₀ in the SacIn condition compared to the NoSac condition are indicated by the number in the column marked <. Those showing increased C₅₀ in the SacIn condition are indicated in the column marked >. Percentages are indicated in parentheses. Only statistically significant differences are shown (Wilcoxon p < 0.05). Note that decreases in C₅₀ indicate increases in neuronal sensitivity. See Materials and Methods for details on how C₅₀ was determined. Of the 79 neurons in our sample, 50 of the neuronal CRFs were well fit with hyperbolic functions in both the SacIn and NoSac conditions (see Materials and Methods). Of these, 21 of 50 (42.0%; 21 of 79 = 26.6%) showed decreases in C₅₀ (Wilcoxon, p < 0.05), indicating an increase in sensitivity with a cue to make a saccade.