Left hemispheric dominance of language processing and handedness, previously thought to be …

• Abstract
• Background
• Results
• Discussion
• Conclusion
• Methods
• Miscellaneous
• References
• Table 1
• Figures

The results of our study demonstrated that early primates already showed hand preference on an individual level and sex-specific orientation asymmetries linked to emotional valence. We suggest that this represents a first step of hemispheric specialization in an evolutionary scenario for handedness and laterality of communication sound processing in primates. As a second step, some anthropoid primates showed handedness at the population level or hemispheric dominance for processing of communication calls of varying emotional valence, but independently from each other. The lateralization of these traits reached highest specialization in humans where both are linked to each other.