Table 1.

Baseline parameters of the last three training days before start of the experiments as measured in the DRT (n = 12)

		Baseline
		Day 1	Day 2	Day 3
Preference large reward (%)	0 s	85.8 ± 8.6	93.2 ± 3.6	94.5 ± 2.1
	5 s	74.2 ± 8.6	67.6 ± 8.9	77.3 ± 8.2
	10 s	23.2 ± 7.6	31.6 ± 7.2	27.8 ± 8.3
	20 s	7.7 ± 2.5	6.9 ± 1.9	5.8 ± 1.9
	40 s	4.4 ± 2.0	3.5 ± 2.4	2.5 ± 1.3
Omission start (average no. per session)		0.6 ± 0.2	0.6 ± 0.1	0.4 ± 0.1
Omission choice (average no. per session)		0.6 ± 0.1	0.7 ± 0.2	0.6 ± 0.1
Omission forced trials (average no. per session)		0.4 ± 0.1	0.3 ± 0.1	0.4 ± 0.1