Study type: Medical/biological study (experimental study)

Can evidence change belief? Reported mobile phone sensitivity following individual feedback of an inability to discriminate active from sham signals. med./bio.

Published in: J Psychosom Res 2008; 65 (5): 453-460

Aim of study (acc. to author)

To test whether providing individuals with electromagnetic hypersensitivity with feedback about their ability to discriminate an active mobile phone signal from a sham exposure had any impact on their symptoms or their perceived sensitivity to mobile phones.

Background/further details

In therapeutic interventions, individual feedback can be used to challenge beliefs and influence symptom severity.
Perceived sensitivity and symptom severity of 58 participants with self-reported electromagnetic hypersensitivity (32 female and 26 male, 18 to 75 years, 83% Caucasian) were measured at 3 times: 1) initial provocation study on the ability to correctly detect mobile phone signals (see publication 13464); 2) feedback intervention (average 1.6 years after provocation study): individual results in the provocation study (31 participants were classified as correct; 27 as incorrect); and 3) follow-up 6 months after feedback intervention.

Endpoint

Exposure

Exposure Parameters
Exposure 1:
  • unspecified
Exposure duration: 50 min ( 30 min without exposure - 50 min exposure or sham exposure - 30 min resting period without exposure)
-
Exposure 2:
  • unspecified
Modulation type: CW
Exposure duration: 50 min ( 30 min without exposure - 50 min exposure or sham exposure - 30 min resting period without exposure)
-

Exposure 1

Main characteristics
Frequency
  • unspecified
Type
Waveform
Exposure duration 50 min ( 30 min without exposure - 50 min exposure or sham exposure - 30 min resting period without exposure)
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Parameters

No parameters are specified for this exposure.

Exposure 2

Main characteristics
Frequency
  • unspecified
Type
Exposure duration 50 min ( 30 min without exposure - 50 min exposure or sham exposure - 30 min resting period without exposure)
Modulation
Modulation type CW
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Parameters

No parameters are specified for this exposure.

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:

Main outcome of study (acc. to author)

No significant differences in perceived sensitivity or in reported symptom severity were found between individuals told that they were correct or incorrect in their ability to detect mobile phone signals.

Study character:

Study funded by

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