Digit ratio (2D:4D), salivary testosterone, and handedness
Digit ratio (2D:4D), salivary testosterone, and handedness
复制标题
DOI：
10.1080/13576500903410369
复制
发表时间：
2011-01-01
期刊：
影响因子：
1.4
通讯作者：
Thome, Johannes
中科院分区：
文献类型：
--
作者：
Beaton, Alan A.;Rudling, Nick;Thome, Johannes
食指相对于无名指的长度，即2D:4D比值，被认为是胎儿环境中睾酮(T)含量的标志（Manning, Scutt, Wilson, Lewis-Jones, 1998）。也有人提出（Geschwind Galaburda, 1987）胎儿睾酮水平升高与左撇子有关，成人循环睾酮水平可能与胎儿睾酮水平有关（Jamison, Meier, Campbell, 1993）。我们使用多元回归分析来调查左手或右手2D:4D比率与惯用手性之间是否存在任何关系。我们还研究了成人唾液T（或皮质醇，用作控制激素）水平是否能预测手指比例和/或惯用手。虽然左手和右手的2D:4D比值与利手性无关，但右手和左手手指比值DR-L的差异是利手性和两双手在移动重物任务中的表现差异的重要预测因子，这支持了先前的研究结果（Manning Peters, 2009; Manning et al., 1998; Manning, Trivers, Thornhill, Singh, 2000; Stoyanov, Marinov, Pashalieva, 2009）。成人循环T水平不能预测左手或右手的手指比例；唾液T（或皮质醇）浓度与手偏好或手技能不对称之间也没有显著关系。我们认为DR-L和手偏好之间的关联是因为DR-L与发育中的胎儿对T的敏感性相关。
The length of the index finger relative to that of the ring finger, the 2D:4D ratio, has been taken to be a marker of the amount of testosterone (T) that was present in the foetal environment (Manning, Scutt, Wilson, Lewis-Jones, 1998). It has also been suggested (Geschwind Galaburda, 1987) that elevated levels of foetal T are associated with left-handedness and that adult levels of circulating T might relate to foetal levels (Jamison, Meier, Campbell, 1993). We used multiple regression analyses to investigate whether there is any relationship between either left or right hand 2D:4D ratio and handedness. We also examined whether adult levels of salivary T (or cortisol, used as a control hormone) predict digit ratio and/or handedness. Although the 2D:4D ratio of neither the left nor the right hand was related to handedness, the difference between the digit ratios of the right and left hands, DR-L, was a significant predictor of handedness and of the performance difference between the hands on a peg-moving task, supporting previous findings (Manning Peters, 2009; Manning et al., 1998; Manning, Trivers, Thornhill, Singh, 2000; Stoyanov, Marinov, Pashalieva, 2009). Adult circulating T levels did not predict the digit ratio of the left or right hand; nor was there a significant relationship between concentrations of salivary T (or cortisol) and either hand preference or asymmetry in manual skill. We suggest that the association between DR-L and hand preference arises because DR-L is a correlate of sensitivity to T in the developing foetus.