“Various types of belief can be implanted in many people after brain function has been deliberately disturbed by accidentally or deliberately induced fear, anger or excitement. Of the results caused by such disturbances, the most common one is temporarily impaired judgement and heightened suggestibility. Its various group manifestations are sometimes classed under the heading of “herd instinct” , and appear most spectacularly in war time, during severe epidemics, and in all similar periods of common, which increase anxiety and so individual or mass suggestibility.”