Comparative studies can help understand better brain functional lateralization for manipulation and language. This study investigated and compared, for the first time, human adults' laterality for manipulation and gestures in a non-experimental social context. We analysed the manual laterality of 48 beach volleyball athletes for four frequently expressed behaviours: a complex throwing action (jump serve) and three gestures (CLAP HAND, PUMP FIST and SLAP HAND-TO-HAND). We evaluated population-level laterality bias for each of the four behaviours separately, compared manual laterality between behaviours and investigated factors influencing gestural laterality. We furthered our between-gestures comparison by taking into account three categories of factors simultaneously: gesture characteristics (sensory modality), interactional context components (positions of interactants and emotional valence), and individual demographic characteristics (age, sex and country). Our study showed that (1) each behaviour considered presented a population-level right-hand bias, (2) differences of laterality between behaviours were probably related to gesture sensory modality and (3) signaller's laterality was modulated differently in relation to positions of interactants, emotional valence, age and sex. Our results support the literature suggesting that left-hemisphere specialization for manipulation and language (speech and gestures) may have evolved from complex manual activities such as throwing and from gestural communication.

中文翻译：

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操纵和手势交流的人类偏向性：对奥运会期间沙滩排球运动员的研究。

比较研究可以帮助更好地理解大脑的功能性偏向于操纵和语言表达。这项研究首次调查和比较了成年人在非实验性社会环境中对操纵和手势的偏见。我们分析了48名沙滩排球运动员的四种常见表现行为的手动偏向性：复杂的投掷动作（跳发）和三种手势（拍手，拳头和拍手）。我们分别评估了四种行为中每种行为的人口水平偏见，比较了行为之间的手动偏见和调查了影响手势偏见的因素。我们通过同时考虑以下三类因素来进一步进行手势间比较：手势特征（感觉模态），互动情境成分（互动者的位置和情感价）以及个人人口统计特征（年龄，性别和国家）。我们的研究表明（1）所考虑的每种行为都呈现出人口水平的右手偏见；（2）行为之间的偏侧性差异可能与手势感觉模态有关；（3）信号器的偏侧性相对于交互物位置的调制方式有所不同，情绪价，年龄和性别。我们的结果支持文献表明，左半球的操纵和语言（语音和手势）专业化可能是从诸如投掷和手势交流等复杂的手动活动演变而来的。我们的研究表明（1）所考虑的每种行为都呈现出人口水平的右手偏见；（2）行为之间的偏侧性差异可能与手势感觉模态有关；（3）信号器的偏侧性相对于交互物位置的调制方式有所不同，情绪价，年龄和性别。我们的结果支持文献表明，左半球的操纵和语言（语音和手势）专业化可能是从诸如投掷和手势交流等复杂的手动活动演变而来的。我们的研究表明：（1）所考虑的每种行为都呈现出人口水平的右手偏见；（2）行为之间的偏侧性差异可能与手势感觉模态有关；（3）信号器的偏侧性相对于交互物位置的调制方式有所不同，情绪价，年龄和性别。我们的结果支持文献表明，左半球的操纵和语言（语音和手势）专业化可能是从诸如投掷和手势交流等复杂的手动活动演变而来的。年龄和性别。我们的结果支持文献表明，左半球的操纵和语言（语音和手势）专业化可能是从诸如投掷和手势交流等复杂的手动活动演变而来的。年龄和性别。我们的结果支持文献表明，左半球的操纵和语言（语音和手势）专业化可能是从诸如投掷和手势交流等复杂的手动活动演变而来的。