Language as an evolutionary pressure of human handedness

Language, rooted in left-hemisphere dominance and a species-wide bias toward right-handedness, stands as a singularly complex cognitive and behavioural domain that has profoundly influenced human evolution. We argue that language should be understood not solely as an adaptation or a by-product of neural expansion and laryngeal descent, but as an active evolutionary force that reinforced pre-existing motor lateralisation. Integrating Tinbergen's four questions with the Baldwin Effect framework, we synthesise evidence from behavioural ecology, comparative neuroscience, and palaeoanthropology to trace the interplay between gestural origins, vocal learning, hemispheric specialisation, and handedness. We propose that language arose as a form of social pressure, amplifying an ancestral right-handed gestural bias through increasingly complex vocal acquisition, thereby linking developmental (ontogenetic) processes with deep evolutionary (phylogenetic) change. This co-evolutionary dynamic produced the pronounced hemispheric asymmetry and right-handedness that distinguish Homo sapiens.