Evidence for impulsivity in the Spontaneously Hypertensive Rat drawn from complementary response-withholding tasks

Table 2 Model-comparison analysis for LHT: Timing accuracy and precision

	Parameters varied across strains
Accuracy	θ and δ	Only θ	Only δ	None
Number of free parameters (k)	7	5	5	3
ΔAICc	0.5	0	45.8	65.1
Precision	w and c	Only w	Only c	None
Number of free parameters (k)	7	5	5	3
ΔAICc	-7.5	0	24.7	23.7

Note. AICc for each model was calculated as AICc (model) = 2k + n ln(RSS/n) + [2k (k + 1)/(n - k - 1)], where k is the number of free parameters (3 strains × parameters varied + parameters not varied + 1 variance parameter) and n is the total number of observations (18 rats × 8 target times - 16 empty cells = 128). ΔAICc is the difference between AICc of each model and AICc of the selected model; ΔAICc of the selected model is, thus, zero. Some models with lower indices were not selected because they did not improve the account by at least 10 points.

ISSN: 1744-9081