'Together with other recent data, our results provide strong support for a mirror neuron theory of autism. This is exciting because we finally have an account that can explain all core symptoms of this disorder.'

The human brain has a matching system of observation and execution that causes mirror neurons to fire both when a person observes others performing a goal-directed action and when he or she carries out the same action. This is the neural mechanism that allows most people to automatically understand others' actions, intentions and emotions, neuroscientists believe.

But autism is characterized by difficulties with social interaction, including verbal and nonverbal communication, imitation and empathy. The new findings dramatically bolster a growing body of evidence pointing to a breakdown of the brain