generic UMTS (WCDMA) test signal [Ndoumbe Mbonjo Mbonjo et al., 2004] including low frequency components of 1500 Hz, simulating power control, and 8-12 Hz, simulating 30 dB power variation due to fading
The exposure cabin was laterally shielded and lined with RF absorbing material. The exposure system used has been described in [Schmid et al., 2005].
Aufbau
Subjects were exposed on the left side of the head using small matched helical antennas built in a modified stereo head phone without metallic parts. They were not informed about the exposure side.
Each subject participated in three testing sessions held at the same time in the afternoon of three separate working days between 10 and 12 days apart. Each testing session consisted of the same four tests done three times under the different exposure levels (high, low, and sham). After each individual test, the participants left the exposure cabin for a standardized break of 3 min. The orders of both the tests and the exposure levels were chosen pseudo-randomly and double-blinded by the control software. Over all three sessions, the duration of exposure was approximately the same for all subjects.
Die Ergebnisse zeigten, dass die Exposition bei dem UMTS-Signal unter diesen experimentellen Bedingungen keine direkte statistischsignifikante Wirkung auf die Aufmerksamkeit oder Reaktionszeit hat. Es traten bei keinem der vier durchgeführten Tests unter den drei verschiedenen Expositions-Bedingungen signifikante Unterschiede auf. Da dieser Studie UMTS-Exposition verwendet wurde, können die Ergebnisse nicht einfach mit denen aus früheren Studien mit GSM-Exposition verglichen werden.
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