Mirror illusion means that standing in front of a mirror placed in sagittal plane, with the head tilted on one side and one arm stretched forward, one side of the body is reflected as if it were the ...other side by mirror visual feedback. The aim of this study was to monitor blood flow changes in middle cerebral artery (MCA) by use of transcranial Doppler (TCD) in individuals during motor tasks and tasks using mirror visual feedback. Eight young healthy volunteers (four male and four female) were included in the study. TCD recording in MCA was done during each task consisting of various motor and visuomotor activities using mirror illusion. Both MCA mean blow flow velocity (MBFV) was measured while the subjects were seated in a comfortable chair. The MCA MBFV recordings are presented as baseline values. During the illusion of motor hand activation, when the subject was making right hand flexions and watching its reflection in the mirror, with the left hand immobile, an increase was observed the contralateral MCA MBFV (task 3, +4.5% baseline value; P = 0.017). Furthermore, when the subject made left hand flexions while watching the reflection of the immobile right hand in the mirror, there was an increase in the right MCA MBFV (+5.6% baseline value; P = 0.044), which was more pronounced than during the illusion of motor hand activation (task 3) and less than during direct vision of hand flexion (task 2, +6.3% baseline value; P = 0.005). Our data showed that visual illusion of action, as well as direct action observation could increase the MCA MBFV, which brings forward the possible usage of mirror illusion as a tool in motor neurorehabilitation.
Iluzija zrcala očituje se time da stojeći ispred zrcala položenog u sagitalnu ravninu, gledajući na jednu stranu gdje nam je ispružena i jedna ruka, vidimo odraz kao da se radi o drugoj strani tijela ...zahvaljujući vizualnom zrcalnom povratu. Cilj ove studije bio je pokazati promjene brzine protoka krvi u srednjoj moždanoj arteriji (ACM) pomoću transkranijskog doplera (TCD) tijekom različitih motoričkih zadataka i zadataka s upotrebom zrcala. Osmoro mladih, zdravih dobrovoljaca (četiri muškarca i četiri žene) sudjelovalo je u ovom istraživanju. Pomoću TCD bilježile su se vrijednosti brzine protoka te promjene brzine u obje ACM, dok su ispitanici obavljali zadatke sjedeći u stolici. Snimljene vrijednosti prikazane su kao srednje vrijednosti. Tijekom iluzije o motoričkoj aktivnosti lijeve ruke pri pomicanju samo desne te gledanju njenog odraza u zrcalu zabilježeno je povećanje srednje brzine strujanja krvi u kontralateralnoj ACM (3. zadatak, porast za 4,5% u odnosu na bazalnu vrijednost, P=0,017). Nadalje, pri pomicanju lijeve ruke dok ispitanik promatra odraz nepomične desne također je došlo do porasta brzine u desnoj ACM (porast za 5,6% u odnosu na bazalnu vrijednost, P=0,044), koji je bio veći nego pri samoj iluziji motoričke aktivnosti (3. zadatak), a manji od porasta tijekom gledanja izravno u ruku koja se pomiče (2. zadatak, porast za 6,3%, P=0,005). Rezultati ovoga istraživanja pokazali su kako vizualna iluzija kretanja, kao i izravno promatranje aktivnosti povećava brzinu protoka krvi u ACM, što upućuje na mogućnost primjene iluzije zrcala u motoričkoj neurorehabilitaciji.
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