Rigamonti M M, Previde E P, Poli M D, Marchant L F, McGrew W C
Center of Primatology HSR - Scientific Institute San Raffaele, INB CNR, University of Milan, Italy.
Cortex. 1998 Dec;34(5):693-705. doi: 10.1016/s0010-9452(08)70773-1.
Ten female pig-tailed macaques (Macaca nemestrina) were tested for hand preference and hand skill (i.e., speed of performance and error rate). The experimental task was naturalistic, calling for adaptive manual skills and fine manipulation: the monkeys had to remove small food rewards embedded in a vertical array, and precision opposition of thumb and forefinger was needed to extract each pellet. Each monkey was tested 10 times on 10 different days. The results indicated individual hand preference rather than population-level handedness; however, a tendency toward right predominance was found. The results on hand skill showed a relation between error rate and hand preference, as the preferred hand made fewer errors. A different and unexpected finding was obtained when skill was evaluated in terms of speed of performance: in adult subjects the left hand was quicker than the right. Therefore, different kinds of skill showed different patterns in relation to hand preference.
对10只雌性豚尾猕猴（食蟹猕猴）进行了手偏好和手部技能（即操作速度和错误率）测试。实验任务是自然主义的，需要适应性的手部技能和精细操作：猴子必须从垂直排列中取出嵌入的小食物奖励，并且需要拇指和食指精确对向才能取出每个颗粒。每只猴子在10个不同的日子里接受了10次测试。结果表明是个体手偏好而非群体水平的利手性；然而，发现了右利手占主导的趋势。手部技能的结果显示错误率与手偏好之间存在关联，因为偏好手犯的错误更少。当根据操作速度评估技能时，得到了一个不同且出乎意料的发现：在成年个体中，左手比右手更快。因此，不同类型的技能在与手偏好的关系上呈现出不同的模式。
