Table 2.

Performance during lever press shaping and acquisition of visual discrimination in the training phase of the two-choice visual discrimination test

Phase	Criterion	Group	Mean ± SEM
Shaping	19 of 24 trials (80%) on last day	wt, SAL	24.0 ± 0.0
		wt, POL	24.0 ± 0.0
		Nurr1+/−, SAL	24.0 ± 0.0
		Nurr1+/−, POL	24.0 ± 0.0
Acquisition	38 of 48 trials (80%) on last 2 d	wt, SAL	47.5 ± 0.3
		wt, POL	47.6 ± 0.1
		Nurr1+/−, SAL	47.7 ± 0.2
		Nurr1+/−, POL	47.8 ± 0.2

The table summarizes the mean ± SEM of correct responses during the initial lever press shaping and subsequent acquisition of visual discrimination processes for each of the four experimental groups, and further outlines the criterion to be reached in each phase. Neither genetic Nurr1 deficiency nor prenatal poly(I:C) exposure affected training performance, so that the four groups were highly comparable in the measure of correct responses during shaping and acquisition phases of the training phase. N(wt, SAL) = 7, N(wt, POL) = 7, N(Nurr1^+/−, SAL) = 6, and N(Nurr1^+/−, POL) = 6. SAL, Saline; POL, poly(I:C); wt, wild type; Nurr1^+/−, heterozygous Nurr1 ablation.