Recurrence plot structure of motor-related human EEG

In present paper we consider structure of recurrence plot (RP) of human motor-related electroencephalography (EEG) signal recorded in somatosensory cortex and filtered in mu-band (8-13 Hz). We show that in averaged EEG signal background activity is mostly characterized by the diagonal lines, while motor task execution is associated with increase of recurrence points density and the emergence of vertical and horizontal lines. We also demonstrate that these features of RP structure also observed in single EEG trials.