Table 1.

Autoshaping, pretraining, and discrimination performance in 5-HTT null mutant mice

	WT	HET	KO
Autoshaping sessions	1.9 ± 0.6	2.3 ± 0.9	2.0 ± 0.6
Pretraining
Respond phase sessions	4.4 ± 1.6	3.4 ± 0.4	3.6 ± 1.1
Punish phase sessions	6.8 ± 1.8	6.1 ± 1.9	7.3 ± 1.9
Discrimination
Total trials	613.0 ± 104.2	389.1 ± 73.0	456.6 ± 157
Total errors	184.3 ± 36.3	111.3 ± 25.1	133.9 ± 47.2
Total correction errors	412.1 ± 88.2	225.9 ± 37.6	261.1 ± 81.8
Total trials omitted	22.4 ± 7.7	4.6 ± 3.6	17.9 ± 10.2
Average stimulus reaction time (s)	8.0 ± 1.0	6.0 ± 1.0	8.2 ± 0.4
Average reward retrieval latency (s)	2.7 ± 0.5	2.8 ± 0.8	2.5 ± 0.4

Genotypes did not significantly differ in autoshaping, pretraining, or discrimination performance, although there was a nonsignificant trend for HET and KO mice to require fewer trials make fewer errors to reach criterion than WT controls. n = 8–10 per genotype. Data are means ± standard errors of the mean.