A study by Joseph Green,  professor at Ohio University, involved  48 students that were found to be highly susceptible to hypnosis . The group of 48 students was divided into two separate groups. 32 of the students were informed prior to the hypnosis that hypnosis could lead to false memories and could not help people remember events that they could not ordinarily remember. The other 16 students were not given any similar information . The students were asked about an uneventful night during their week , where they experienced uninterrupted sleep, uninfluenced by alcohol or other drugs , and inability to recall dreams . While the students were placed under hypnosis, they were told that they had heard a loud noise at 4 a.m. After hypnosis, the students were asked if they remembered hearing a loud noise at 4 a.m. 28\% of the informed students and 44 \% of the uninformed students claimed that they had heard a loud noiseat 4 a. m. Green found that the " warnings are helpful to some extent in discouraging pseudomemories, but did not prevent pseudomemories and did not reduce the confidence subjects had in those memories. " 
 Joseph Green, a professor at Ohio University, conducted a study on Hypnotherapy false memories. In the study, 48 student who had been shown to be highly susceptible to hypnosis were divided into two groups. Before they were hypnotized, 32 of the students were warned that hypnosis could lead to false memories and could not make people remember things that they would not ordinarily remember. The remaining 16 students were not given such a warning . Then the students were asked to select an uneventful night from the previous week -- a night they had uninterrupted sleep, uninfluenced by alcohol or drugs and without any dreams that were recalled. During hypnosis, the students were asked if they had heard a loud noise at 4 A.M. during that night. After hypnosis, they were asked if they recalled hearing a loud noise at 4 A.M. during the night in question. Twenty-eight percent of the forewarned students and 44 percent of those who were not warned about false memories claimed that they had heard such a noise. ''The results suggest that warnings are helpful to some extent in discouraging pseudomemories, '' Dr. Green said, adding, ''Warnings did not prevent pseudomemories and did not reduce the confidence subjects had in those memories. '' In a separate study Dr. Green conducted with the help of three students at Ohio State, 160 students were divided into three groups. One underwent self-hypnosis and another deep relaxation, while a third did counting exercises. All of them were told that the regimen would help them recall their earliest memories. Forty percent of those in the hypnosis group later recalled a memory of something that occurred on or before their first birthday. Similar recollections were reported by only 22 percent of those in the relaxation group and 13 percent in the counting group.
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In a separate study Dr. Green conducted with the help of three students at Ohio State, 160 students were divided into three groups. One underwent self-hypnosis and another deep relaxation, while a third did counting exercises. All of them were told that the regimen would help them recall their earliest memories. Forty percent of those in the hypnosis group later recalled a memory of something that occurred on or before their first birthday. Similar recollections were reported by only 22 percent of those in the relaxation group and 13 percent in the counting group.