Research Paper Volume 17, Issue 3 pp 778—797

Figure 1. Age-dependent impairment in performance on the DRST in macaques and marmosets. (A) Depiction of a single DRST trial, reproduced from Glavis-Bloom et al., 2022. (B) Marmoset and (C) macaque individual learning curves. Each line denotes an individual animal, with color indicating the age during testing. The dashed black line represents chance level performance. Marmoset learning curves are reproduced from Glavis-Bloom et al., 2022. Correlations show that increasing macaque (red) and marmoset (blue) age is associated with (D) more trials needed to perform above chance in the Novice Phase, (E) reduced maximum learning rates in the Learning Phase, and (F) smaller working memory capacity. When averaging across ages, no interspecies differences were observed in (G) trials to above-chance performance, (H) maximum learning rates, or (I) working memory capacity. Each circle in (D–F) represents one individual. Ages in (D–F) correspond to the age at the time of assessment. Each circle in boxplots in (G–I) represents one subject, colors according to age of subject in color scales in (B) for marmosets and (C) for macaques. Marmoset data presented in (D–G) are re-plotted from Glavis-Bloom et al., 2022.