Aging in Rhesus Macaques Is Associated With Changes in Novelty Preference and Altered Saccade Dynamics

Nathan Insel, María Luisa Ruiz-Luna, Michelle Permenter, Julie Vogt, Cynthia A. Erickson, Carol A. Barnes

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Studies demonstrating recognition deficits with aging often use tasks in which subjects have an incentive to correctly encode or retrieve the experimental stimuli. In contrast to these tasks, which may engage strategic encoding and retrieval processes, the visual paired comparison (VPC) task measures spontaneous eye movements made toward a novel as compared with familiar stimulus. In the present study, seven rhesus macaques aged 6 to 30 years exhibited a dramatic age-dependent decline in preference for a novel image compared with one presented seconds earlier. The age effect could not be accounted for by memory deficits alone, because it was present even when familiarization preceded test by 1 second. It also could not be explained by an encoding deficit, because the effect persisted with increased familiarity of the sample stimulus. Reduced novelty preference did correlate with eye movement variables, including reaction time distributions and saccade frequency. At long delay intervals (24 or 48 hours) aging was paradoxically associated with increased novelty preference. Several explanations for the age effect are considered, including the possible role of dopamine.

Original languageEnglish
Pages (from-to)1328-1342
Number of pages15
JournalBehavioral Neuroscience
Issue number6
StatePublished - Dec 2008


  • aging
  • attention
  • novelty
  • recognition memory
  • saccades


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