Testing Models of Handedness in Stone Tools
When, why, and how did humans develop the extreme right-handedness found in this species? As reviewed in this chapter, several hypotheses have been proposed to explain the distribution of handedness in humans. The social learning hypothesis posits that similarity in hand configuration between demonstrator and learner facilitates learning; the fighting hypothesis states that a left-hander minority is maintained by an advantage in close combat; and the task complexity hypothesis proposes that task complexity increases hand preference. The three hypotheses are compared in terms of how they might be detected in the stone tool record. The power of the archaeological record is carefully considered to address hand preference and handedness at the level of individuals and groups, and how stone tools can help to test the predictions of the various hypotheses for the evolution of right-handedness in our species.