Authors
Smythe JW, Costall B (2003)

Sixty-two healthy volunteers (33 men, 29 women) were randomly assigned to one of three experimental conditions: no phone exposure; exposure to an 1800 MHz mobile phone (SAR 0.79 w/kg); and inactive phone exposure. They were provided with a series of words to learn, structured in a two-dimensional shape, and given 3 minutes to memorize the words. After a 12-minute distraction task they were then asked to draw the shape (spatial) and place the correct words (semantic) into the appropriate boxes. The phone groups held the phone to their left ear during the acquisition and distraction phases (15 minutes total). The subjects were not informed about whether the phone was active or not. One week later the subjects were asked to redraw the shape and words.

The results showed that the males exposed to an active phone made fewer spatial errors than those exposed to an inactive phone.

In this study the number of subjects was small (15 males used an active phone). Randomization took place in the whole group, but the results were reported separately for males and females. When the "no phone" group was included in the analysis the results showed no significant difference in the number of errors made. The results were inconsistent e.g. in the active phone group the males had more errors in the spatial recall task, although the result was not statistically significant.


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