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Related Experiment Video

Updated: Jun 1, 2025

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Social isolation increases impulsive choice with minor changes on metabolic function in middle-aged rats.

Jassmyn J Venegas1, Jacob M Weisz1, Chan Young Choi1

  • 1Department of Psychology, University of Illinois Urbana-Champaign, Champaign, Illinois, USA.

Physiological Reports
|January 17, 2025
PubMed
Summary

Social isolation in middle age increases impulsive choice behavior in rats. However, it does not affect anxiety-like behavior or metabolic function, with males showing distinct metabolic profiles.

Keywords:
impulsive choiceinsulin resistancemetabolic functionmiddle agesocial isolation

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Area of Science:

  • Neuroscience
  • Behavioral Biology
  • Endocrinology

Background:

  • The impact of social isolation (SI) during middle age on behavior and metabolism is not well understood.
  • Middle age is a critical period for physiological changes, making it important to study the effects of environmental factors like SI.

Purpose of the Study:

  • To test the hypothesis that social isolation in middle-aged rats increases impulsive choice (IC) behavior, anxiety-like behavior, and metabolic dysfunction.
  • To investigate sex-specific differences in response to social isolation and metabolic challenges.

Main Methods:

  • Middle-aged male and female rats (11 months old) were housed individually (social isolation) or in groups for two months.
  • Impulsive choice behavior was assessed using a delay-discounting task.
  • Anxiety-like behavior was measured via a novelty-suppressed feeding task, and metabolic function was evaluated using oral glucose tolerance and insulin tolerance tests after high-fat diet exposure.

Main Results:

  • Socially isolated rats exhibited significantly more impulsive choice behavior compared to group-housed rats, irrespective of sex.
  • No significant effects of social isolation were observed on anxiety-like behavior, glucose tolerance, or insulin sensitivity.
  • Male rats displayed higher plasma insulin concentrations and a greater insulin resistance index than female rats.

Conclusions:

  • Social isolation during middle age is sufficient to induce impulsive choice behavior in rats.
  • The study highlights significant sex-specific differences in metabolic profiles, with males being more susceptible to insulin resistance.
  • Further research is needed to elucidate the mechanisms underlying the effects of social isolation across different life stages.