Metabolic activation of amygdala, lateral septum and accumbens circuits during food anticipatory behavior

Sep 14, 2016Behavioural brain research

Increased activity in emotion, motivation, and reward systems during food anticipation

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Abstract

Neural metabolism peaked before nursing in specific brain regions of rabbit pups during food anticipatory behavior.

Rabbit pups exhibit increased brain activity during the hours leading up to their once-daily nursing event.
Metabolic peaks were observed in the extended amygdala and lateral septum prior to feeding, indicating anticipatory neural mechanisms.
Post-feeding, metabolic activity shifted to regions associated with reward delivery, including the accumbens shell and caudate.
The observed neural and behavioral activation continued even during fasting, aligning with the expected nursing time.
Findings suggest that brain circuits related to reward expectation may play a role in food anticipatory activity.

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When food is restricted to a brief fixed period every day, animals show an increase in temperature, corticosterone concentration and locomotor activity for 2-3h before feeding time, termed food anticipatory activity. Mechanisms and neuroanatomical circuits responsible for food anticipatory activity remain unclear, and may involve both oscillators and networks related to temporal conditioning. Rabbit pups are nursed once-a-day so they represent a natural model of circadian food anticipatory activity. Food anticipatory behavior in pups may be associated with neural circuits that temporally anticipate feeding, while the nursing event may produce consummatory effects. Therefore, we used New Zealand white rabbit pups entrained to circadian feeding to investigate the hypothesis that structures related to reward expectation and conditioned emotional responses would show a metabolic rhythm anticipatory of the nursing event, different from that shown by structures related to reward delivery. Quantitative cytochrome oxidase histochemistry was used to measure regional brain metabolic activity at eight different times during the day. We found that neural metabolism peaked before nursing, during food anticipatory behavior, in nuclei of the extended amygdala (basolateral, medial and central nuclei, bed nucleus of the stria terminalis), lateral septum and accumbens core. After pups were fed, however, maximal metabolic activity was expressed in the accumbens shell, caudate, putamen and cortical amygdala. Neural and behavioral activation persisted when animals were fasted by two cycles, at the time of expected nursing. These findings suggest that metabolic activation of amygdala-septal-accumbens circuits involved in temporal conditioning may contribute to food anticipatory activity.

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Metabolic activation of amygdala, lateral septum and accumbens circuits during food anticipatory behavior

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