文章指出，左撇子约占人群的 10%，这一比例在历史上保持稳定；研究以演化稳定策略解释此现象。当右撇子占多数时，左撇子因稀少而在一对一竞争中更难预测，因此获得频率依赖优势；但若左撇子变得常见，这种优势就会减弱。这形成一种稳定均衡：右撇子较有利于合作，左撇子则较有利于竞争。
第一项实验纳入约 1,100 名参与者，以问卷测量用手偏向与竞争特质。结果显示，左手偏向程度较高者更倾向以自我发展为导向参与竞争，且较少因焦虑而回避竞争；在强烈单侧化群体中，左撇子的 hypercompetitiveness 分数也更高。第二项实验纳入 48 名参与者，左右撇子各半，男女比例相等；pegboard 测试未发现左右撇子在手部灵巧度上有显著差异，也未见灵巧度与竞争分数之间有显著关联。
研究还指出，左撇子优势似乎主要局限于竞争倾向，而非整体人格或心理健康。样本在 Big Five 人格特质、忧郁与焦虑上未见显著左右手差异。性别方面，男性整体在 hypercompetitiveness 与发展导向竞争上得分较高，女性则更常因焦虑而避免竞争；这表示用手偏好、竞争风格与性别之间存在多因素交互作用，仍需进一步研究。
The article argues that left-handed people make up about 10% of the population, and this share has remained stable across history; the study explains this pattern through evolutionarily stable strategy. When right-handers are the majority, left-handers gain a frequency-dependent advantage because their rarity makes them less predictable in one-to-one competition; if left-handedness became common, that advantage would weaken. This creates a stable equilibrium: right-handedness is more favorable for cooperation, while left-handedness is more favorable for competition.
The first experiment included about 1,100 participants and used questionnaires to measure handedness and competitive traits. Results showed that stronger left-hand laterality was associated with more development-oriented competitiveness and less anxiety-driven avoidance of competition; among strongly lateralized groups, left-handers also scored higher on hypercompetitiveness. The second experiment included 48 participants, split evenly between right- and left-handers and balanced by sex; a pegboard test found no significant dexterity differences between groups and no significant link between dexterity and competitiveness scores.
The study further suggests that the left-handed advantage is mainly limited to competitive orientation rather than broader personality or mental health. The sample showed no significant handedness differences in the Big Five traits, depression, or anxiety. By sex, men scored higher overall on hypercompetitiveness and development-oriented competitiveness, while women were more likely to avoid competition because of anxiety; this indicates that handedness, competitive style, and sex interact through multiple factors that require further research.