33 subjects (12 female, 21 male) who had slept adequatly during the previous night, aged between 19 and 27 years, healthy, and normal vision, participated in this study. The visual discrimination threshold was determined in intervals of about 10 seconds to examine the visual sensitivity. Flashes appeared on a screen increasing their luminance in steps up to the moment the subject could recognize them.
Previous studies on the influence of the geomagnetic field on the VDThr [Thoss et al., 2002; Thoss and Bartsch, 2003] were used as a positive control for this study. Thoss F, Bartsch B, Tellschaft D, Thoss M (2002): The light sensitivity of the visual system depends on the direction of view. J Comp Physiol A 188:235-237.
|Repetition frequency||217 Hz|
|Chamber||The investigation was performed in a soundproof unshielded room. The subject was positioned 0.8 m in front of a white screen behind which the antenna was placed.|
|Setup||At the position of the head, the main radiation lobe was so broad that small movements had negligible influence on SAR values. Reflections were minimized by flat RF absorbers behind and to the left and right of the subject.|
|Sham exposure||A sham exposure was conducted.|
|Additional info||Each subject attended two sessions one week apart: the RF and the sham exposure session, in randomized and single-blind fashion. Each of the sessions consisted of two parts of 30 min each, separated by a 5-min break. For each RF exposure, the field was applied only during the second 30-min part of the session.|