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Very Low Frequency (VLF) sferics are electromagnetic impulses with frequencies between 1 kHz and 100 kHz, which are generated by lightning discharges.
The average level of sferics activity differed between the experiments due to the annual rhythm of sferics activity, as thunderstorms are more common in the summer.
Within both experiments, ESP scores and the level of sferics activity in the 24h interval before the session were not correlated significantly with each other (r=-.