![]() Increased use of the right hand meant that we started employing the right hand for pretty much everything. They used their right hand, because this is controlled by the left hemisphere. As our ancestors learned to walk upright, they started using their hands to communicate as well as their voices. The left hemisphere controls vocalization in most species. However, we are not evolved to be left-handed to any significant degree.Īccording to New Zealand psychologist Michael Corballis, the human propensity to be right-handed i s caused by our heightened ability to communicate. ![]() Bush, Reagan, Carter and Ford would all have probably smudged their writing when they were at school. Are we in our own “Mouse Utopia” in which Darwinian selection has collapsed? The latest piece of evidence for this: we are becoming more left-handed.Ī surprising number of recent US presidents have been southpaws. The results were horrifying: increasingly bizarre behaviour patterns, a collapse in reproduction, eventual extinction. In creating this “Mouse Utopia” (pictured right) the experiment replicated post-industrial conditions in the West, where child mortality has fallen from 40% to about 1% since 1800, due to dramatically improved medicine and living conditions. Tts aim was to understand what would happen if Darwinian selection massively weakened. Led by the startlingly creative scientist John B. Between 19, a fascinating experiment took place at the University of Maryland.
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