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Effect of Post-Weaning Individual Housing on Autonomic Responses in Male Rats to Sexually Receptive Female Rats

机译:断奶后个体住房对雄性大鼠对性接受雌性大鼠的自主神经反应的影响

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Post-weaning individual housing induces significant alterations in the reward system of adult male rats presented with sexually receptive female rats. In this study, we examined the effects of post-weaning individual housing on autonomic nervous activity in adult male rats during encounters with sexually receptive female rats to assess whether different affective states depending on post-weaning housing conditions are produced. Changes in heart rate and spectral parameters of heart rate variability indicated that in post-weaning individually housed male rats, both sympathetic and parasympathetic activity increased with no change in the sympathovagal balance, while in post-weaning socially housed male rats, both sympathetic and parasympathetic activity decreased with a predominance of parasympathetic activity. These two patterns of shifts in sympathovagal balances closely resembled changes in autonomic nervous activity with regard to classical appetitive conditioning in male rats. The autonomic changes in male rats housed individually after weaning corresponded to changes associated with the reward-expecting state evoked by the conditioned stimulus, and the autonomic changes observed in male rats housed socially after weaning corresponded to changes associated with the reward-receiving state evoked by the unconditioned stimulus. These results suggest that different affective states were induced in adult male rats during sexual encounters depending on male-male social interactions after weaning. The remarkable change caused by post-weaning individual housing may be ascribed to alteration of the reward system during sexual encounters induced by deficiency of intermale social communication after weaning.
机译:断奶后的个体住房在成年雄性大鼠和性接受雌性大鼠的奖励系统中引起重大变化。在这项研究中,我们检查了断奶后个体住房对成年雄性大鼠与性接受雌性大鼠相遇时自主神经活动的影响,以评估是否根据断奶后住房条件产生了不同的情感状态。心率和心率变异性频谱参数的变化表明,在断奶后单独饲养的雄性大鼠中,交感和副交感神经活动均增加,而交感迷走平衡没有变化,而在断奶后社交饲养的雄性大鼠中,同情和副交感神经都副交感神经活动明显减少。交感神经平衡的这两种变化模式与雄性大鼠经典食欲条件的自主神经活动变化极为相似。断奶后单独饲养的雄性大鼠的自主神经变化对应于条件刺激引起的奖励预期状态的变化,而断奶后社交的雄性大鼠观察到的自主性变化对应于由刺激引起的奖励接收状态的变化。无条件的刺激。这些结果表明,断奶后成年雄性大鼠在性交期间会诱发不同的情感状态,这取决于断奶后男女之间的社交互动。断奶后个体住房引起的显着变化可能归因于断奶后男性间社会交往不足引起的性交期间奖励制度的改变。

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