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It has been suggested that dogs’ ability to comprehend human pointing gestures evolved as a by-product of the socio-emotional changes associated with domestication. Given the large role played by the oxytocin system in socio-emotional processes, it is possible to hypothesize a role for oxytocin in modulating dogs’ socio-communicative skills. Indeed, it has been shown that intranasal oxytocin enhances...
Studying the emotional consequences of social behaviour in nonverbal animals require methods to access their emotional state. One such method is provided by cognitive bias tests. We applied a judgement bias test to tufted capuchin monkeys, Sapajus sp., to evaluate (1) whether receiving grooming was associated with a short-term increase in ‘optimism’ (that is, a positive bias in the interpretation...
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