Cognition, Behavior, and Memory
Author: Micaela Betsabe Marini | email: micaelamarini@gmail.com
Micaela Betsabe Marini 1°, Maria Cecilia Martínez 1°
1° Laboratorio de Fisiología de Circuitos Neuronales, Grupo Neurociencia de Sistemas, IFIBIO-Houssay, Facultad de Medicina, Universidad de Buenos Aires-CONICET
Mammals undergo multiple physiological and behavioral changes associated with the transition between youth and adulthood which help them acquire the skills necessary for their independence. In general, adolescents exhibit characteristic behaviors, such as increases in social interactions, a preference for novelty, and risk-taking activities. In previous work from our lab, we found age-related differences in the performance of male Long Evans rats in a self-paced rewarded task. Since developmental divergences between sexes might affect learning, here we studied the performance of both male and female adolescents and adults. In this task, after a minimum waiting interval of 2.5 s, the animals must enter a nose poke and emit an eight-lick sequence onto a sip tube to obtain a reward. Consistently with our former electrophysiology results, we found a higher prevalence of impulsive trial-starting in adolescents. Regarding this, we also analyzed other behavioral markers that could account for the premature response in adolescents such as locomotor activity, memory formation, or, decision-making in the spontaneous exploration of a multiple-regions arena. Our results show suggest that adolescent rats display more premature responses in the rewarded task. Still, this impulsivity is not related to increases in their locomotor activity or deficits in memory formation. Besides, females exhibited slight variations in the learning strategies in some of the tasks.