Relationship between impulsivity, hyperactivity and working memory: a differential analysis in the rat

Table 5 Summary of working memory scores of groups of rats selected in each task.

Impulsive task	groups	Total number of errors	Errors in the first 8 choices	Time to reach the pellets
Fixed consecutive number schedule (FCN 8)	LOW_FCN	5.4 ± 0.4	2.0 ± 0.2	8.9 ± 0.8
	INT_FCN	4.1 ± 0.7	1.6 ± 0.2	9.7 ± 0.9
	HIGH_FCN	4.9 ± 0.6	1.8 ± 0.1	9.0 ± 0.8
Multiple Fixed interval/extinction schedules of reinforcement	LOW_FI	4.8 ± 0.7	1.6 ± 0.1	9.9 ± 1.2
	INT_FI	4.6 ± 0.4	1.8 ± 0.1	9.3 ± 0.6
	HIGH_FI	4.8 ± 0.7	2.0 ± 0.2	8.6 ± 0.6
	LOW_EXT	3.8 ± 0.5	1.4 ± 0.2	8.7 ± 0.8
	INT_EXT	4.4 ± 0.4	1.7 ± 0.1	8.7 ± 0.5
	HIGH_EXT	5.7 ± 0.5*	2.3 ± 0.2**	8.3 ± 0.5
Delay discounting	LOW_CHX	4.7 ± 0.6	1.9 ± 0.2	8.9 ± 0.5
	INT_CHX	4.7 ± 0.4	1.9 ± 0.9	8.9 ± 0.7
	HIGH_CHX	4.1 ± 0.7	1.5 ± 0.2	10.4 ± 1.4

Groups of rats were selected for their level of inhibition in the Fixed Consecutive Number schedule of reinforcement task (FCN8); their level of activity in the Multiple Fixed interval/extinction schedules or their choice for the larger reward in the Delay discouting task. Scores measured in the 8-arm radial maze (mean of the 5 last sessions ± SEM) were compared between groups with low scores (LOW), intermediate (INT) and high scores (HIGH) in each task. Parameters measured in the radial maze (mean of the five last sessions ± SEM) were compared between groups. Statistical analysis of comparisons with HIGH, GLM with adjusted p-values (FDR procedure) **, p < .01, * p = .05.

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