Mobile Phone 'Talk' and 'Listen' Modes Have Opposite Effects on the Sleep EEG

Mobile phone ‘talk’ and ‘listen’ mode signals are pulsed modulated microwaves, sharing the same pulse modulation frequencies at 8 and 217 Hz. However, listen mode has an extra 2 Hz modulation. Our previous study using EEG visual scoring and spectral analysis showed talk-mode to delay sleep onset (Hung et al. 2007). Here, we examine the sleep EEG itself, especially during stage 2 (S2) and slow-wave sleep (SWS), in the first non-rapid eye movement sleep, to see if there are further differential effects of these phone signals.