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A 15-year-old girl has had six episodes over three months in which she falls to the floor and her arms and legs thrash irregularly for fifteen to twenty minutes. Her eyes are squeezed shut throughout and she pushes the examiner's hand away when they are opened. She has never been incontinent and has never bitten her tongue, and she answers questions normally within a minute of an episode stopping. Every episode has occurred at school. Levetiracetam started by another doctor has made no difference. Which one of the following investigations will best establish the cause of her episodes?
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