Social preference in rats: They preferred social over nonsocial options, choosing their cagemate rat over an empty chamber, and an unfamiliar over a familiar rat, choosing a non‐cagemate over their cagemate

Social preference in rats. Timothy D. Hackenberg  Lauren Vanderhooft  Jasmine Huang  Madeline Wagar  Jordan Alexander  Lavinia Tan. Journal of the Experimental Analysis of Behavior, March 13 2021 https://doi.org/10.1002/jeab.686

Rolf Degen's take: https://twitter.com/DegenRolf/status/1375443533646155781

Abstract: Rats were given repeated choices between social and nonsocial outcomes, and between familiar and unfamiliar social outcomes. Lever presses on either of 2 levers in the middle chamber of a 3‐chamber apparatus opened a door adjacent to the lever, permitting 45‐s access to social interaction with the rat in the chosen side chamber. In Experiment 1, rats preferred (a) social over nonsocial options, choosing their cagemate rat over an empty chamber, and (b) an unfamiliar over a familiar rat, choosing a non‐cagemate over their cagemate. These findings were replicated in Experiment 2 with 2 different non‐cagemate rats. Rats preferred both non‐cagemate rats to a similar degree when pitted against their cagemate, but were indifferent when the 2 non‐cagemates were pitted against each other. Similar preference for social over nonsocial and non‐cagemate over cagemate was seen in Experiment 3, with new non‐cagemate rats introduced after every third session. Response rates (for both cagemate and non‐cagemate rats) were elevated under conditions of nonsocial (isolated) housing compared to conditions of social (paired) housing, demonstrating a social deprivation effect. Together, the experiments contribute to an experimental analysis of social preference within a social reinforcement framework, drawing on methods with proven efficacy in the analysis of reinforcement more generally.

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I knew I was a rat...