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A broad variety of perceptual, sensorimotor and cognitive operations have shown to be linked to electroencephalographic (eeg) oscillatory activity. For instance, movement preparation or cognitive processing were linked to delta band (1–5 Hz) oscillations. Such link could be exploited in brain-computer interface (bci) paradigms translating modulations of brain activity into control signals of external devices or computers. However, current bcis are often driven by fast rhythmic brain activity, e.g. in the alpha (9–15 Hz) or beta band (15–30 Hz). Introducing slower oscillations, such as delta or theta (4–8 Hz) band activity, might extent the spectrum of bci applications, particularly in the context of bci-related restoration of movements. To detect voluntary modulations of motor cortical activity in such paradign, an active interval during which users are instructed to e.g. imagine hand movements becomes compared to a …