The only extensive study [of the frequency of hallucinations] was a poor one done in the last century in England. Only hallucinations of normal people when they were in good health were counted. Of 7717 men, 7.8 percent had experienced hallucinations at some time. Among 7599 women, the figure was 12 percent. Hallucinations were most frequent in subjects between twenty and twenty-nine years of age, the same age incidentally at which schizophrenia most commonly occurs. There were twice as many visual hallucinations as auditory. National differences were also found. Russians had twice as many hallucinations as the average. Brazilians had even more because of a very high incidence of auditory hallucinations. Just why is anyone's conjecture. One of the deficiencies of this study, however, is that in a country where ghosts are exciting gossip, it is difficult to have accurate criteria of what is actually seen and heard as an hallucination. There is an important need for further and better studies of this sort.

• brazil
• england
• hallucinations
• russia
• schizophrenia
• time
• gossip
• poor