Social touch is an important aspect of human social interaction - across all cultures, humans engage in kissing, cradling and embracing. These behaviors are necessarily asymmetric, but the factors that determine their lateralization are not well-understood. Because the hands are often involved in social touch, motor preferences may give rise to asymmetric behavior. However, social touch often occurs in emotional contexts, suggesting that biases might be modulated by asymmetries in emotional processing. Social touch may therefore provide unique insights into lateralized brain networks that link emotion and action. Here, we review the literature on lateralization of cradling, kissing and embracing with respect to motor and emotive bias theories. Lateral biases in all three forms of social touch are influenced, but not fully determined by handedness. Thus, motor bias theory partly explains side biases in social touch. However, emotional context also affects side biases, most strongly for embracing. Taken together, literature analysis reveals that side biases in social touch are most likely determined by a combination of motor and emotive biases.

社交触觉是人类社会互动的重要方面-在所有文化中，人类都在亲吻，拥抱和拥抱。这些行为必定是不对称的，但是决定它们偏侧化的因素却不是很容易理解。因为手经常参与社交活动，所以运动偏好可能导致不对称行为。但是，社交接触经常发生在情感环境中，这表明偏见可能会受到情感加工过程中不对称性的调节。因此，社交接触可以提供对链接情感和动作的侧脑网络的独特见解。在这里，我们回顾关于运动和情绪偏差理论的拥抱，亲吻和拥抱的偏侧化的文献。社交接触的所有三种形式中的横向偏见均会受到影响，但不能完全由惯用手法决定。因此，运动偏见理论部分解释了社会交往中的侧面偏见。但是，情感环境也会影响偏见，尤其是在拥抱时。综上所述，文献分析表明，社交接触中的偏见最有可能由运动偏见和情绪偏见共同决定。