20 subjects (12 male) were divided into two groups (group1: n=14, group 2: n=6) and participated in four sessions (two mornings, two afternoons), where they received randomized exposure or sham exposure.
None of the subjects detected the existence of the magnetic field. The exposure had no significant influence on the results of the tests.
In the present study human cognitive functions were unaffected by the magnetic field.
The results indicate that extremely low frequency electromagnetic fields in the occupational environment are unlikely to interfere with human brain function so much as to lower working efficiency or accuracy.