ИСТИНА

INTRODUCTION. Mirror therapy is a widely used method to improve motor function after stroke [1]. Such a phenomenon as mirror-box illusion (MBI) is an attractive tool to study the processes of visual-motor integration. When a mirror is placed, along the sagittal plane in between the two hands, reflection of moving limb can give the illusion of bimanual movements. Observation of such illusion as well as simple action observation leads to the activation of the brain regions involved in motor control [2,3]. But it remains unclear - is voluntary control of the movement important for the mirror illusion and are there any differences between observing the movement of another person and observing the movement illusion? MATERIALS AND METHODS. The study involved 24 volunteers. We studied somatosensory EEG activity during left hand movement illusion, that was induced by refection of moving right hand. It was moved by subject (voluntary) or by FES (involuntary). In third condition during movement performing subjects had to observe real-time video of their moving hand (MO). Using common localizer task, we constructed sensitive spatial filters to identify sources of sensorimotor spectral events: movement related ERD, post-movement beta-rebound (PMBR). RESULTS. We have found significant ipsi-lateral increase of mu-ERD in FES conducted mirror illusion, but no any significant differences in MBI condition with voluntary movement. Moreover, in MO condition we found bilateral significant mu power decrease and PMBR was larger in ipsi-lateral sources. CONCLUSION. Our data show, that MBI can be induced by FES, moreover, observation of passive movement reflection leads to more effective mu-ERD increase. Also, while both MO and MBI activates sensorimotor area, they do it in different ways.