Handedness and sex effects on lateral biases in human cradling: Three meta-analyses.

摘要: Abstract The earliest form of social contact for a newborn is being cradled by its mother. This important behavior has been found to be lateralized the left side many, but not all empirical studies. Factors that have suggested modulate cradling asymmetry are handedness and sex. However, these factors demonstrated consistently, possibly due low sample sizes inconsistent experimental paradigms. To address this issue, we used meta-analytical approach (1) quantify widely reported leftward bias in human (2) identify moderating such as Across forty studies, observed showing effect robust replicable. Furthermore, left-handers demonstrate significantly less pronounced compared right-handers males females. In conclusion, could verify parental sex contribute population bias. Future studies examining genetic illuminate mechanism supporting