Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4315565 | Behavioural Brain Research | 2007 | 7 Pages |
Abstract
Alarm calls are widely used in mammals. Their biological function is to deter predators and warn relatives of danger. Despite this important function of alarm calls, the development of alarm call recognition is poorly understood. Using laboratory rats, the present study investigated in a first experiment whether alarm calls are recognized innately. In experimentally naive animals, we found significantly increased freezing if stimuli in the 22Â kHz range were presented but this response was not specific to conspecific 22Â kHz calls. Therefore, a second experiment addressed the hypothesis whether recognition of conspecific 22Â kHz calls can be learned and whether this learning is facilitated by a preparedness to acquire defensive responses to alarm calls. Our data show that rats learned quickly to associate the 22Â kHz calls with aversive stimuli. Interestingly, the animals were more reluctant to extinguish this memory, and this information retained longer in memory than in the case of other types of calls and ultrasonic stimuli. We, therefore, conclude that rats are predisposed to acquire adaptive defensive behaviour in response to alarm calls. In particular, our data indicate that better encoding of such learning in rats leads to a stable memory which better resists extinction.
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Authors
Thomas Endres, Katrin Widmann, Markus Fendt,