For more than half a century, the kinds of antisocial personality traits we think of as psychopathic – such as a lack of remorse, aggression, and disregard for the wellbeing of others – have been associated with mental illness.
. Cultural influences may also determine how much a person favors one hand over the other, allowing them to fit into communities that favor the right-handed.
Since the researchers in this study found no clear evidence that psychopathic subjects were less likely to be right-handed, it might be assumed that their development hasn't necessarily been affected by their environment to any significant extent. Sample sizes aside, it's hard to limit variables in studies like these, making it impossible to exclude the possibility of confounding conditions muddying the waters.
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