De-arousal properties of stereotyped behaviour: Evidence from pituitary—Adrenal correlates in pigs

Robert Dantzer, Pierre Mormede
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引用次数: 93

Abstract

Behavioural and pituitary-adrenal responses of food-deprived pigs, submitted to an intermittent food delivery schedule repeated over several weeks, were investigated.

All animals reliably displayed stereotyped activities, in the form of repeated chain pulling, during the interval between food deliveries. The temporal characteristics of this behaviour and its relation to deprivation level suggest its analogy with adjunctive activities.

Chain-pulling behaviour was accompanied by decreased pituitary-adrenal activity, as indicated by changes in plasma corticosteroid concentrations between the beginning and the end of the experimental session.

When the opportunity to engage in chain pulling was removed, corticosteroid levels did not fall below the pre-session levels. Comparisons of animals able to engage in stereotypies with animals unable to do so because the chain had been removed showed that presession levels of plasma corticosteroids were higher in the former group than in the latter, while post-session plasma corticosteroids did not differ. In addition, the opportunity to engage in adjunctive activities did not protect the animals from the activating effects of extinction on the pituitary-adrenal axis.

These data would suggest that stereotypies enable the animals to decrease excessive arousal rather than provide an extra source of stimulation.

刻板行为的去唤醒特性:来自猪垂体-肾上腺相关物的证据
研究了被剥夺食物的猪的行为和垂体-肾上腺反应,这些猪在几周内反复接受间歇性食物输送计划。所有的动物都可靠地表现出刻板的活动,在食物传递的间隔期间,以重复拉链的形式。这种行为的时间特征及其与剥夺水平的关系表明它与辅助活动相似。从实验开始和结束时血浆皮质类固醇浓度的变化可以看出,拉链行为伴随着垂体-肾上腺活性的下降。当参与链式拉扯的机会被移除时,皮质类固醇水平并未低于会前水平。将能够产生刻板印象的动物与由于该链被移除而无法产生刻板印象的动物进行比较,结果表明,前一组的血浆皮质激素水平高于后一组,而治疗后的血浆皮质激素水平没有差异。此外,参与辅助活动的机会并不能保护动物免受灭绝对垂体-肾上腺轴的激活作用。这些数据表明,刻板印象使动物减少过度的兴奋,而不是提供额外的刺激来源。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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