Effects of experience and context on 50-kHz vocalizations in rats

Physiology & Behavior
Markus WöhrBerry Spruijt

Abstract

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 variability in call production can be observed. The present two studies were conducted to further determine factors other than reward, which may influence or even induce calling. Experiment A showed that 50-kHz calls were emitted in relatively high numbers during short isolation in test cages, and, to a lesser extent, also during testing in an open field and an elevated plus maze. Despite inter-individual variability, calling behavior was individually stable over days and occurred irrespective of whether rats were tested in a cage with or without familiar rat scents. These data indicate that 50-kHz calling is not necessarily a response to the presence of pleasurable or social stimuli. Additionally, it was observed that call emission during isolation is strongly affected by prior experience. Rats that had been trained repeatedly in ...Continue Reading

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Citations

May 9, 2012·Experimental Brain Research·Jaime N BaskenMichelle R Ciucci
Apr 12, 2013·Cell and Tissue Research·Markus Wöhr, Rainer K W Schwarting
Jun 15, 2013·Behavioural Brain Research·Lauren E RingelMichelle R Ciucci
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Aug 19, 2011·Journal of Visualized Experiments : JoVE·Aaron M JohnsonMichelle R Ciucci
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Feb 11, 2014·Journal of Neuroscience Methods·Dominik SefferMarkus Wöhr
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Oct 20, 2011·Behavioural Brain Research·Antonia G VitaloJohn B Levine
May 25, 2010·Pharmacology, Biochemistry, and Behavior·C Natusch, R K W Schwarting
Sep 18, 2009·Pharmacology, Biochemistry, and Behavior·Markus Wöhr, Rainer K W Schwarting
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Aug 8, 2014·Frontiers in Behavioral Neuroscience·Anders Hånell, Niklas Marklund

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