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Performance on the IOWA card task by adolescents and adults. Age differences in affective decision making as indexed by performance on the Iowa Gambling Task. Cortex 23 — These observations are thought to mirror the maturation of the PFC, which allows the transition from impulsive to more controlled choices. Reward sensitivity for a palatable food reward peaks during pubertal developmental in rats. Motor impulsivity refers to behavioral disinhibition and loss of impulse control, without necessary integration of emotional processing Brunner and Hen, Psychiatry 63 —

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Impulsivity as a vulnerability marker for substance-use disorders. Compared to controls, rats stressed for 7 consecutive days during adolescence showed higher nicotine-induced enhancement of locomotor activity. this effect was not reported when stress occurred during adulthood Cruz et al. Resistance to peer influence has also been positively correlated with ventral striatum activation, but negatively correlated with activation in the amygdala Pfeifer et al. Given the relations between stress and drug-seeking behaviors Shaham et al.

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Investigations assessing the effect of psychostimulants in adolescent rats using a CPP task remain a bit controversial, but a greater reward sensitivity in adolescents rats, particularly at lower doses, has been claimed in specific conditions Badanich et al. Since testosterone cross the blood brain barrier Pardridge and Mietus, , it contributes to the cortical pruning during adolescence, especially in frontal and temporal lobes Witte et al. Noteworthy, adolescence also represents a particular period of emotional perception and regulation. The juvenile period in rodents lasts from day 28 to day 42 after birth, but these limits, a bit restrictive, are usually extended to include a larger period from day 25 to day 55 Tirelli et al. Interestingly, these authors conclude that even if an increased recreational drug use is usually observed during adolescence, evidence relating to pathological drug seeking and taking still is lacking.

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Description: Nicotine dependence and reward differ between adolescent and adult male mice. Age differences in sensation seeking and impulsivity as indexed by behavior and self-report. It is important to note that the increased impulsiveness reported in adolescent smokers might be a consequence, and not a predictor, of the addicted behavior. Because adolescents display more impulsive behaviors, the link between impulsivity and drug consumption has been extensively studied. The use, distribution or reproduction in other forums is permitted, provided the original author s or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. In contrast to the relatively early and rapid changes in affective systems that appear to be linked to pubertal maturation, another set of cognitive skills and competence in self-control seem to develop gradually across adolescence and continue to mature long after puberty is over Dahl, Therefore, deeper investigations assessing PFC interindividual adaptations during adolescence are required to understand how only specific developmental trajectories can lead to drug addiction.
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