Modulation of Brain Criticality via Suppression of EEG Long-Range Temporal Correlations (LRTC) in a Closed-Loop Neurofeedback Stimulation

Human behavioral and cognitive performance are beset by imperfections. Even in simple tasks, where a subject is instructed to tap with a finger at a fixed interval produce errors, no matter whether the tapping is cued by a metronome (Hennig et al., 2011) or not (Gilden et al., 1995). Fluctuations of tapping errors do not demonstrate a random variation between taps but show temporally correlated patterns that extend up to hundreds of seconds (Gilden et al., 1995). The error time series can be described via a power-law of the frequency spectrum defined by P(f)∝1/f β, where P denotes the power of the frequency component f, while the scaling exponent β refers to the propagation of tapping errors (Gilden et al., 1995).

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