Social modulation of risky decision-making in rats (Rattus norvegicus) and tufted capuchin monkeys (Sapajus spp.).

摘要: Abstract Both human and non-human animals frequently deal with risky decisions in a social environment. Nevertheless, the influence of context on decision-making has been scarcely investigated. Here, we evaluated for first time whether presence conspecific influences risk preferences rats tufted capuchin monkeys. Subjects received series choices between constant, safe option variable, option, both alone (Alone condition) when paired (Paired condition). The average payoff was always lower than that option. Overall, two species differed their attitude towards risk: whereas were indifferent options, capuchins exhibited preference In species, changed Paired condition compared to Alone condition, although an opposite way. Whereas increased over conspecific, chose less condition. Moreover, anxiety-like behaviours decreased across sessions rats, these where more represented capuchins. Thus, our findings extends distantly-related evidence, so far available beings, decrease anxiety corresponds increase preferences, vice versa. This suggests modulation by observed monkeys may rely common, evolutionarily ancient, mechanism.