Table 2.

Behavioral measures related to choice strategy. The degree of choice bias, the proportion of consecutive same choices (repetition; 2–4), the proportions of win-stay and loose-switch choices, and the response latency are summarized for the block-trial and random-trial tasks (mean ± SEM; n = 3 animals in each task). E, I and H: easy, intermediate and hard blocks, respectively.

	Saline			Muscimol (0.1 μg)			Muscimol (0.2 μg)
Block	E	I	H	E	I	H	E	I	H
BLOCK-TRIAL TASK
Choice bias (%)	50.0 ± 0.1	50.0 ± 0.0	50.0 ± 0.0	50.5 ± 1.1	50.4 ± 0.5	50.4 ± 0.5	50.0 ± 0.0	50.0 ± 0.0	50.2 ± 0.2
Repetition (2 × , %)	44.5 ± 1.2	47.0 ± 0.4	45.3 ± 1.3	46.3 ± 1.7	45.4 ± 3.6	43.9 ± 3.8	46.1 ± 5.2	45.7 ± 7.1	45.9 ± 10.9
Repetition (3 × , %)	17.4 ± 0.6	19.1 ± 1.3	20.6 ± 1.7	18.7 ± 2.7	20.4 ± 4.4	21.0 ± 4.0	25.0 ± 5.6	23.1 ± 6.6	26.6 ± 10.1
Repetition (4 × , %)	6.7 ± 1.0	7.3 ± 0.7	10.0 ± 1.7	7.7 ± 2.0	9.2 ± 3.8	11.6 ± 3.6	15.0 ± 5.2	12.0 ± 4.1	17.2 ± 7.7
Win-stay (%)	46.0 ± 1.3	47.8 ± 1.2	50.2 ± 2.1	45.8 ± 0.8	46.6 ± 3.6	49.1 ± 2.1	37.5 ± 5.8	53.1 ± 0.8	56.4 ± 4.2
Loose-switch (%)	46.0 ± 5.3	52.0 ± 3.2	48.7 ± 2.3	50.8 ± 12.0	49.9 ± 4.3	46.1 ± 4.0	51.2 ± 4.4	46.1 ± 5.1	46.5 ± 3.9
Response latency (s)	0.51 ± 0.05	0.53 ± 0.05	0.52 ± 0.05	0.44 ± 0.04	0.44 ± 0.04	0.44 ± 0.04	0.45 ± 0.03	0.46 ± 0.02	0.45 ± 0.03
RANDOM-TRIAL TASK
Choice bias (%)	50.1 ± 0.07			50.0 ± 0.03			50.0 ± 0.0
Repetition (2 × , %)	48.7 ± 0.8			46.2 ± 5.1			44.0 ± 3.8
Repetition (3 × , %)	21.2 ± 0.7			23.2 ± 4.9			23.3 ± 3.9
Repetition (4 × , %)	8.2 ± 0.6			12.5 ± 3.4			12.6 ± 1.8
Win-stay (%)	48.9 ± 1.7			42.7 ± 3.8			39.3 ± 3.7
Loose-switch (%)	50.3 ± 7.9			47.3 ± 7.3			47.3 ± 2.8
Response laency (s)	0.51 ± 0.2			0.45 ± 0.12			0.45 ± 0.17