Choline Uptake in the Frontal Cortex Is Proportional to the Absolute Error of a Temporal Memory Translation Constant in Mature and Aged Rats

Abstract The relationship between the magnitude of the error in the content of temporal memory and sodium-dependent high-affinity choline uptake (SDHACU) in the frontal cortex and hippocampus was examined in mature (10- to 16-month-old) and aged (24- to 30-month-old) male rats. The peak time of the response rate distribution that relates the probability of a response to signal duration in a 20-s peak-interval timing procedure was used to index the remembered time of reinforcement. Regression analyses indicated that SDHACU in the frontal cortex of both mature and aged rats and in the hippocampus of aged rats is proportional to the absolute error in the content of temporal memory. These biochemical effects of peak-interval training were also compared with biochemical measures taken from control rats that received random-interval training. This comparison indicated that the observed changes in SDHACU were dependent upon the predictability of the programmed time of reinforcement and age-related changes in memory encoding and retrieval.

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