Value-based decision making in common marmoset

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While the value of consumable rewards increase if animals get hungry and thirsty, it is still unclear how the satiety state affect the preference of consumable goods, and hence how choice behaviors are driven. To address this issue, I examine the choice behavior of six marmoset monkeys (Callithrix jacchus) for consumable rewards. I measured their choices and preferences of foods in each monkey in different hunger levels. Each monkey showed stochastic choices in the sated condition frequently. However, the choice stochasticity dramatically decreased when they were hungry. In addition, preferences of each food items appeared to be stable between different satiety levels. These evidences suggested that preferences are not inconsistent among different satiety level, but monkeys behave less stochastic as they become hungrier.