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

Table 4 Summary of the results of locomotor activities of the different subgroups.

Impulsive task	groups	Novelty-induced locomotor activity	Basal nocturnal locomotor activity	Amphetamine- induced locomotor activity
Fixed consecutive number schedule (FCN 8)	LOW_FCN	365.5 ± 49.7	614.0 ± 78.2	252.2 ± 32.3 **
	INT_FCN	484.2 ± 27.4	595.6 ± 41.9	215.4 ± 22.9 *
	HIGH_FCN	416.0 ± 37.9	606.1 ± 61.1	124.2 ± 15.6
Multiple Fixed interval/extinction schedules of reinforcement	LOW_FI	484.6 ± 44.1	606.6 ± 49.3	216.4 ± 37.4
	INT_FI	421.9 ± 25.6	597.7 ± 48.6	191.3 ± 21.8
	HIGH_FI	474.3 ± 56.9	553.8 ± 48.4	188.2 ± 31.1
	LOW_EXT	405.2 ± 45.2	551.9 ± 60.2	227.7 ± 52.2
	INT_EXT	442.6 ± 25.8	612.3 ± 50.7	286.2 ± 28.0
	HIGH_EXT	516.4 ± 51.6	583.6 ± 26.7	201.4 ± 37.4
Delay discounting	LOW_CHX	418.8 ± 48.4	517.3 ± 50.4	218.5 ± 44.7
	INT_CHX	471.6 ± 31.1	597.2 ± 40.5	279.8 ± 33.9
	HIGH_CHX	436.9 ± 35.2	648.4 ± 71.0	223.2 ± 28.6

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. Groups with low scores (LOW), intermediate (INT) and high scores (HIGH) in each task, were compared for their locomotor activities (mean ± SEM) in a circular corridor in three different conditions: during response to novelty (first two hours), after habituation during nocturnal phase (10 h), and 10 to 40 min after 1 mg i.p. amphetamine injection (peak of response). Statistical analysis of comparisons with HIGH, GLM with adjusted p-values (FDR procedure), **, p < .01; * p < .05.

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