Skip to content
MacBrain
Menu
  • Home
  • About
  • Activ
  • Disclaimer
  • People
  • Privacy Policy
  • RESOURCES
  • Contact Us
Menu

Influences of Early Life Experiences on Behavior in Japanese Macaques: Modulation of Outcome by Genetic and Social Factors

Posted on March 23, 2021January 11, 2023 by MacBrain research team

A pair of small, affiliated studies that emerged from the study on the timing of maternal separation were conducted at the Oregon Health and Science University These studies investigated the role played by early experience in determining later behaviors, by examining the modulation of genetic and social influences on behavior in Japanese macaques.

One relevant early life experience in Japanese macaques is a decrease in maternal attention due to mating season or the birth of a new sibling. Factors that could influence individual differences in behavioral reaction to this experience include temperament, biological disposition (behavioral inhibition, growth hormone responsiveness) and social or environmental factors (dominance rank, social support, infant abuse). In humans, socio-economic status (SES) determines access to resources and influences vulnerability to some illnesses. One study examined whether the same may hold true for dominance rank and Japanese macaques.

The study examined whether temperament predicts response to the birth of a sibling. Only a small percentage of the monkeys studied were determined to be temperamentally inhibited. Among these monkeys, none displayed the expected responses to the birth of a sibling (decreases in social play, increases in the amount of time spent alone, agitation, and distress vocalizations, changes in levels of aggression). On the contrary, the amount of time spent receiving social contact increased compared to non-inhibited monkeys. (Inhibited monkeys received much less social contact than non-inhibited monkeys before the birth of a sibling, but received much more than non-inhibited monkeys after the birth of a sibling.) This occurs not as a result of the inhibited monkeysÂ’ active seeking out of social contact, but perhaps as the result of subtle cues that lead to greater social contact from other monkeys.

The second study examined the relation between dominance rank and behavioral inhibition in predicting response to decreases in maternal attention during mating season. Behavioral inhibition was measured using four tests: a free play test, a remote-controlled car test, a human intruder test and a novel fruit test. There were no differences between high- and low-dominance individuals on the free play, car, or human intruder tests, but low-ranked monkeys did take longer to inspect the novel fruit. Other variables such as biological factors (csf monoamine metabolites, HPA activity) and early life events such as abuse may be involved.

 

MacBrain

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Recent Posts

  • Strategies for Enhancing Cognitive Development Through Play
  • The Role of Nutrition in Supporting Mental Health for Children and Teens
  • Nutrition’s Impact on Adolescent Brain Function and Academic Performance
  • Innovative Play-Based Learning Strategies for Enhancing Cognitive Development in Early Childhood
  • Easing the Stress of Air Travel with Young Children

Recent Comments

No comments to show.

Archives

  • November 2024
  • October 2024
  • May 2024
  • March 2024
  • February 2023
  • December 2022
  • November 2022
  • October 2022
  • September 2022
  • July 2022
  • May 2022
  • April 2022
  • March 2022
  • August 2021
  • May 2021
  • April 2021
  • March 2021
  • December 2020
  • August 2020
  • June 2020
  • April 2020
  • February 2020
  • October 2019
  • September 2019
  • July 2019
  • June 2019
  • April 2019
  • March 2019
  • October 2018

Categories

  • Articles
© 2025 MacBrain | Powered by Superbs Personal Blog theme