Hopkins W D, Fernández-Carriba S
Department of Psychology, Berry College, PO Box 495019, Mount Berry, GA 30149-5019, USA.
Neuropsychologia. 2000;38(4):403-9. doi: 10.1016/s0028-3932(99)00092-5.
This study examined the effect of situational factors on hand use for feeding in a sample of captive chimpanzees. Lateral bias in hand use was tested in biased and unbiased testing circumstances to assess strength and consistency in hand preference. For both unbiased and biased testing conditions, population-level right hand preferences were found for the sample. In the biased condition, subjects were more likely to overcome positional factors in order to feed with their right hand contrasted with the left. Overall, hand use in the biased and unbiased testing conditions was significantly positively correlated. In terms of strength of hand use, juveniles were found to be less lateralized than sub-adults and adults. Moreover, juvenile females were found to be more lateralized than juvenile males. Taken together, the data suggest that chimpanzee hand preferences for feeding are not constrained by situational factors and are relatively consistent in biased and unbiased testing conditions.
本研究考察了情境因素对圈养黑猩猩样本进食时手部使用的影响。在有偏差和无偏差的测试环境中测试了手部使用的侧向偏好，以评估手部偏好的强度和一致性。对于无偏差和有偏差的测试条件，均发现该样本在群体水平上存在右手偏好。在有偏差的条件下，与左手相比，受试者更有可能克服位置因素而用右手进食。总体而言，有偏差和无偏差测试条件下的手部使用显著正相关。就手部使用强度而言，发现幼年黑猩猩的偏侧化程度低于亚成年和成年黑猩猩。此外，发现幼年雌性比幼年雄性的偏侧化程度更高。综合来看，数据表明黑猩猩进食时的手部偏好不受情境因素的限制，并且在有偏差和无偏差的测试条件下相对一致。
