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To be a successful dieter, one has to be able to consistently resist immediate temptations in order to achieve the bigger, but delayed rewards of weight loss, increased attractiveness and better health. These long-term benefits are by no means guaranteed as the delayed rewards are more uncertain than the immediate rewards. Several researchers have suggested that the population of restrained eaters...
Rats can emit ultrasonic 50-kHz vocalizations which are generally assumed to reflect the animals' positive emotional state. However, some aspects question the reliability of 50-kHz calls as indicators of positive affective states. Firstly, rats also emit them in novel environments containing scents of other rats, or even while being victims of intra-species aggression. Secondly, huge inter-individual...
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