Figure 1
Food retrieval during the Object Responsivity Test. (a) Retrieval frequency during complex object trials for all monkeys. Individually-housed monkeys retrieved food significantly more frequently than socially-housed monkeys and grate-paired monkeys retrieved food significantly less frequently than those housed in full-contact. (b) Retrieval frequency during simple (triangle) and complex (circle) object trials for monkeys who completed both trial types. Groups did not differ significantly in retrieval frequency when both levels of object complexity were included. Means ± adjusted 95% confidence intervals and individual data are shown. (c) Cumulative probability of food reward retrieval as a function of time elapsed in trial during complex object trials. Individually-housed monkeys retrieved food significantly faster than socially-housed monkeys and grate-paired monkeys retrieved food significantly slower than monkeys housed in full-contact. (d) Cumulative probability of food reward retrieval as a function of time elapsed in trial during simple (solid line) and complex (dashed line) object trials for monkeys who completed both trial types. Individually-housed monkeys retrieved food significantly faster than socially-housed monkeys in the presence of complex, but not simple, objects. Survival curves are shown. Retrieval latencies of 30 s (no retrieval) are right-censored.
