Table 1.

Performance on the probabilistic reversal task with 10 % probability of punished correct responses.

PRL measures	HET-No-AS	HET-AS	WT-No-AS	WT-AS	AS	Genotype	Genotype × AS
Number of trials completed	60	60	60	60	n.s.	n.s.	n.s.
Number of reversals	5.33 ± 0.23a	4.33 ± 0.37b	4.89 ± 0.31	5.27 ± 0.38	n.s.	n.s.	p < 0.05; a vs. b
p reward-stay	0.85 ± 0.02	0.82 ± 0.02	0.83 ± 0.02	0.85 ± 0.03	n.s.	n.s.	n.s.
p NFS	0.69 ± 0.06	0.58 ± 0.05	0.60 ± 0.06	0.56 ± 0.06	n.s.	n.s.	n.s.
Session duration (s)	636.00 ± 44.00a	896.67 ± 111.03b	770.67 ± 81.05	705.82 ± 78.37	n.s.	n.s.	p < 0.05; a vs. b
Post-reinforcement latency (s)	4.0 ± 0.4a	6.1 ± 0.9b	4.8 ± 0.8	4.5 ± 0.7	n.s.	n.s.	p < 0.08; a vs. b
% trials with long post-reinforcement latency	1.2 ± 0.6a	4.4 ± 1.4b	3.0 ± 1.2	2.4 ± 0.7	n.s.	n.s.	p < 0.05; a vs. b
Number of errors per reversals	1.66 ± 0.21	1.32 ± 0.15	2.09 ± 0.30	1.89 ± 0.32	n.s.	p < 0.07	n.s.
Number of errors after reversal	10.83 ±1.79	13.67 ± 1.56	13.00 ± 1.55	11.46 ± 2.41	n.s.	n.s.	n.s.
Feeder response latency (ms)	626.58 ± 19.95	1421.28 ± 652.65	724.00 ± 75.95	1071.96 ± 428.92	n.s.	n.s.	n.s.
Number of feeder responses	99.75 ± 3.85	108.33 ± 6.18	98.44 ± 5.38	108.18 ± 7.14	n.s.	n.s.	n.s.

Results are reported as mean ± s.e.m, n.s.: not significant.