Study type: Medical/biological study (experimental study)

Neurophysiological effects of flickering light in patients with perceived electrical hypersensitivity. med./bio.

Published in: J Occup Environ Med 1997; 39 (1): 15-22

Aim of study (acc. to author)

To examine whether there are differences in neurophysiological responses to light stimulation of different frequencies and modulation depth between hypersensitive persons and healthy subjects.

Background/further details

Ten patients with neurological and skin problems that they claimed to result from visual display terminal (VDT), fluorescent light, or television exposure were included in the study. Ten subjects without any problems associated with VDT work or light exposure served as the control group. The participants were exposed to flash stimulation at frequencies of 20, 25, 35, 45, 55, 65, and 75 flashes per second. The depth of modulation was investigated at 100, 75, and 50 % modulation at 45 Hz.

Endpoint

Exposure

No exposure details are available.

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

A statistically significant difference in the visual evoked potential amplitudes between the patient and control groups was observed. No differences were revealed in the retinal responses.

Study character:

Study funded by

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