Perceptual disturbances occur in all sensory modalities. They include misinterpretations and distortions of environmental stimuli, as well as self-generated hallucinations. The pathogenesis of these phenomena is largely unknown, but disturbances in specific sensory modalities have diagnostic implications. 

Keyboard typing is rhythmic with frequency characteristics roughly the same as neural oscillatory dynamics associated with cognitive control. We tested the hypothesis that synchronization occurs between typing and mental states.