 What saves the cycle network is the doctor who starts with .8 credence (bottom left). They start out optimistic enough to keep going after the group encounters an initial string of dismaying results. In the complete network, however, they receive so much negative evidence early on that they give up almost right away. Their optimism is overwhelmed by the negative findings of their many neighbours. Whereas the cycle exposes them to less of this discouraging evidence, giving them time to keep experimenting with the novel treatment, ultimately winning over their neighbours.