Lee TMC, Lam P-K, Lee LTS, Chan CCH (2003).

The aim of this study was investigate the relationship between the duration of exposure and the effect of the electromagnetic field emitted by mobile phones on human attention.

The authors randomly assigned 78 volunteers to an experimental or a control group. A GSM phone was mounted to the subject's head during the procedure with the earphone over the right ear. The participants did not know whether the phone was on or off, although the experimenter did. Two tasks of attention were performed while the phone was on in the experimental group and off in the control group. The subjects were required to complete the tasks within 25 minutes, and after a 2- minute rest the tasks were repeated, but the phone was switched off in both groups.

There was no difference between the groups in the reaction times or in the number of correct responses in the first task. Reaction time in both groups significantly improved in the second trial, suggesting a practice effect. In this task, the experimental group improved its reaction time in the second trial significantly more that the controls. The authors interpret this as suggesting "that attention functions may be differentially enhanced after exposing to the electromagnetic field emitted by mobile phones. Furthermore, this transient facilitation effect might be dose dependent". In the second task, there was no significant difference in performance between the 2 groups, although both the experimental and the control group improved in the second trial.

There were a large number of statistical tests performed in this study and the single significant result could have been obtained by chance. There are also errors in Table 2. The senior author (personal communication) has informed us that these will be corrected in a future issue of the journal. The errors do not change the findings discussed in this summary.

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