Interest in non-social novel stimuli as a function of age in rhesus monkeys.

There were patterns suggesting that older monkeys might retrieve less food from the puzzle and all monkeys might retrieve more food from the puzzle on the second day compared to the first, but these did not reach statistical significance; effect of age F (1,∼432.1) = 2.74, p = 0.098, effect of day F (1,∼241) = 3.41, p = 0.066, age × day interaction F (1,∼241) = 0.087, p = 0.77.

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