To determine the monkey's stage of puberty, monthly physical and hormonal measurements are completed. While the monkey's birthdate and age are known, these are not good measures for the stage of puberty that the monkey is in. Our current cohort is made up of male monkeys with the goal of expanding to females in the future to evaluate how sex differences may affect social and nonsocial decision making.
Our monkeys’ physical growth has been consistent with previously reported studies and can further elucidate how correlated hormonal changes are with bodily growth and behavior. Current hormones of interest include testosterone, estradiol, follicular stimulating hormone (FSH), and luteinizing hormone (LH). With future possible evaluations of inhibin-B, cortisol, CRP, DHEA-S, and kisspeptin.
To evaluate the connections between the PFC and amygdala, we conduct diffusion tensor imaging (DTI) once a year (directionally encoded colored tensor weighted imaging visualized above). These scans are then processed to create tractography revealing the white matter and whole brain volume changes. These measures along with the physical and hormonal will be compared to task behavior to determine which, if any, best predict changes in behavior.