74 male subjects were randomly assigned to one of five groups, which differed in (1) the type of information they were given concerning the expected magnetic field effect on performance in cognitive tests (positive = enhancement of the performance; negative = impairment of the performance; neutral) and (2) the type of exposure (real or sham exposure). Three groups were sham-exposed with positive (group+), negative (group-) and neutral information (group+/-); one group was really exposed with neutral information (exposure group) and one group was not exposed, they did not receive any field-related information (control group). All the subjects, except the control group, were led to believe that they would be exposed to a magnetic field of 400 µT.
The subjects wore a magnetic helmet for exposing the head to a homogeneous50 HzMF. The helmet is a cubic structure formed by six Helmholtz coils distributed in three orthogonal directions. There was no perceptible warming nor noise under experimental conditions.
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