Age differences in within-session habituation of exploratory behavior: effects of stimulus complexity

Michael J. Brennan, Donald Allen, David Aleman, Efraim C. Azmitia, David Quartermain

Research output: Contribution to journalArticlepeer-review


The effects of age on the habituation of exploratory behavior of 8-month- and 28-month-old male C57BL/NNia mice were examined under three different stimulus complexity conditions. Increases in the degree of stimulus complexity resulted in an attenuation of between-session habituation and an initial disruption of within-session habituation by 8-month-old mice. Although increases in stimulus complexity also resulted in an increase in the overall level of exploration by aged mice, stimulus complexity was not found to have a systematic effect on between- or within-session habituation by aged mice. No between-session habituation was observed in aged mice under any of the stimulus complexity conditions. Further, aged mice exhibited significant within-session increases, rather than decreases, in exploration under each stimulus complexity condition. This disruption of within-session habituation in aged mice was found to persist over four daily test sessions. In view of the specific patterns of exploration by aged mice, the disruption of within-session habituation was attributed to age-related differences in reactivity to the arousal-inducing properties of novel stimuli.

Original languageEnglish (US)
Pages (from-to)61-72
Number of pages12
JournalBehavioral and Neural Biology
Issue number1
StatePublished - Sep 1984

ASJC Scopus subject areas

  • Physiology


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