Mild maternal stress disrupts associative learning and increases aggression in offspring

L. Eaton*, E. J. Edmonds, T. B. Henry, D. L. Snellgrove, K. A. Sloman

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)


    Maternal stress has been shown to affect behaviour of offspring in a wide range of animals, but this evidence has come from studies that exposed gestating mothers to acute or severe stressors, such as restraint or exposure to synthetic stress hormones. Here we show that exposure of mothers to even a mild stressor reduces associative learning and increases aggression in offspring. Female guppies were exposed to routine husbandry procedures that produced only a minimal, non-significant, elevation of the stress hormone cortisol. In contrast to controls, offspring from mothers that experienced this mild stress failed to learn to associate a colour cue and food reward, and showed a greater amount of inter-individual variation in behaviour compared with control offspring. This mild stress also resulted in offspring that were more aggressive towards their own mirror image than controls. While it is possible that these results could represent the transmission of beneficial maternal characteristics to offspring born into unpredictable environments, the potential for mild maternal stress to affect offspring performance also has important implications for research into the trans-generational effects of stress.

    Original languageEnglish
    Pages (from-to)10-15
    Number of pages6
    JournalHormones and Behavior
    Publication statusPublished - May 2015


    • Guppies
    • Maternal effects
    • Mirror-image test
    • Plus-maze learning
    • Viviparity

    ASJC Scopus subject areas

    • Endocrinology
    • Behavioral Neuroscience
    • Endocrine and Autonomic Systems


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