Can Materialists Have Free Choice?

According to the materialist philosophy that still dominates the sciences, there is no free will. The human mind is nothing but brain activity, and the brain is a genetically programmed computer. So can materialists have free choice, including the choice to believe in materialism? If they can, it would suggest the mind is more than just brain activity. In this dialogue, Rupert and Mark explore this question and discuss recent research on free will.