Jamison C S
Anthropology Department, Indiana University, Bloomington 47405.
Am J Phys Anthropol. 1988 Aug;76(4):505-13. doi: 10.1002/ajpa.1330760410.
Palmar dermatoglyphic prints were taken of 261 dyslexics (173 males and 88 females) and compared against those of 707 controls (372 males and 335 females). Dyslexics of both sexes were found to exhibit greater complexity in terms of ridge count and pattern location than controls, particularly on the left hand. Specifically, both male and female dyslexics exhibited higher left a-b counts, wider atd angles on both palms, and higher frequencies of pattern in left interdigital area IV. Additionally, male dyslexics also had higher right a-b counts and greater frequency of pattern in the left hypothenar area. Dyslexics of both sexes were also found to have more distally located axial triradii, and investigation of bilateral asymmetry found dyslexics to exhibit more directional asymmetry than controls in the variable of a-b count, with the left value for both groups being greater than the right. It was concluded that the study evidenced strong support for the hypothesis that some causative factor relating to the development of dyslexia is operating during the time period in which dermatoglyphic features are formed. The relevance of these findings in terms of the Geschwind hypothesis and the possible importance of prenatal testosterone are discussed.
对261名诵读困难者（173名男性和88名女性）采集了手掌皮纹印，并与707名对照者（372名男性和335名女性）的皮纹印进行比较。发现男女诵读困难者在嵴纹数和花纹位置方面比对照者表现出更大的复杂性，尤其是在左手。具体而言，男女诵读困难者左手a - b嵴纹数更高，双手atd角更宽，左手第IV指间区花纹出现频率更高。此外，男性诵读困难者右手a - b嵴纹数也更高，左手小鱼际区花纹出现频率更高。还发现男女诵读困难者的轴三叉点位置更靠远心端，对双侧不对称性的研究发现，在a - b嵴纹数变量上，诵读困难者比对照者表现出更多的方向不对称性，两组的左侧值均大于右侧值。研究得出结论，该研究有力支持了以下假设：在皮纹特征形成的时间段内，存在某种与诵读困难发展相关的致病因素在起作用。讨论了这些发现与盖什温德假说的相关性以及产前睾酮的可能重要性。
