Gordon Dianne J, Rogers Lesley J
Centre for Neuroscience and Animal Behaviour, School of Science and Technology, University of New England, Armidale, NSW 2351, Australia.
Centre for Neuroscience and Animal Behaviour, School of Science and Technology, University of New England, Armidale, NSW 2351, Australia.
Behav Brain Res. 2015;287:100-8. doi: 10.1016/j.bbr.2015.03.037. Epub 2015 Mar 24.
Common marmosets (Callithrix jacchus) have hand preferences for grasping pieces of food and holding them while eating and these are stable throughout adult life. We report here that left-handed marmosets have negative cognitive bias compared to right-handed marmosets. Twelve marmosets were trained to expect a food reward from a bowl with a black lid and not from one with a white lid, or vice versa. In probe tests with ambiguous, grey-lidded bowls a left-handed group (N=7) were less likely to remove the lid to inspect the bowl than a right-handed group (N=5). This difference between left- and right-handed marmosets was not dependent on rate of learning, sex or age. In fact, hand-preference was not associated with rate of learning the task. Furthermore, retrospective examination of colony records of 39 marmosets revealed that more aggression was directed towards left- than right-handed marmosets. Hence, hand preference, which can be measured easily, could serve as an indicator of cognitive bias and may signal a need for particular care in laboratory environments. We explain the results by arguing that hand preference reflects more frequent (or dominant) use of the opposite hemisphere and this predisposes individuals to behave differently.
普通狨猴(Callithrix jacchus)在抓取食物并在进食时握住食物方面有手部偏好,且这些偏好在成年期保持稳定。我们在此报告,与惯用右手的狨猴相比,惯用左手的狨猴存在消极认知偏差。12只狨猴接受训练,使其预期从有黑色盖子的碗中获得食物奖励,而不是从有白色盖子的碗中获得,反之亦然。在使用灰色盖子的模糊碗进行的探测测试中,惯用左手的一组(N = 7)比惯用右手的一组(N = 5)更不愿意打开盖子检查碗。惯用左手和惯用右手的狨猴之间的这种差异不取决于学习速度、性别或年龄。事实上,手部偏好与学习任务的速度无关。此外,对39只狨猴群体记录的回顾性检查显示,针对惯用左手的狨猴的攻击行为比对惯用右手的狨猴更多。因此,易于测量的手部偏好可以作为认知偏差的指标,并且可能表明在实验室环境中需要特别照顾。我们通过论证手部偏好反映了对相反半球更频繁(或占主导)的使用来解释这些结果,这使个体表现出不同的行为。