Prospective memory in the rat |
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Authors: | A George Wilson Jonathon D Crystal |
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Institution: | (1) Department of Psychology, University of Georgia, Athens, GA 30602-3013, USA;(2) Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN 47405-7007, USA;; |
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Abstract: | The content of prospective memory is comprised of representations of an action to perform in the future. When people form
prospective memories, they temporarily put the memory representation in an inactive state while engaging in other activities,
and then activate the representation in the future. Ultimately, successful activation of the memory representation yields
an action at an appropriate, but temporally distant, time. A hallmark of prospective memory is that activation of the memory
representation has a deleterious effect on current ongoing activity. Recent evidence suggests that scrub jays and non-human
primates, but not other species, are capable of future planning. We hypothesized that prospective memory produces a selective
deficit in performance at the time when rats access a memory representation but not when the memory representation is inactive.
Rats were trained in a temporal bisection task (90 min/day). Immediately after the bisection task, half of the rats received
an 8-g meal (meal group) and the other rats received no additional food (no-meal group). Sensitivity to time in the bisection
task was reduced as the 90-min interval elapsed for the meal group but not for the no-meal group. This time-based prospective-memory
effect was not based on response competition, an attentional limit, anticipatory contrast, or fatigue. Our results suggest
that rats form prospective memories, which produces a negative side effect on ongoing activity. |
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