Author/Editor		Brežan, Simon; Rutar, Veronika; Logar, Vito
Title		Elektroencefalografska koherenca med vidnimi in motoričnimi področji možganske skorje pri vidno-motorični nalogi
Translated title		Electroencephalographic coherence between visual and motor areas of cerebral cortex during visuomotor task
Type		članek
Source		Med Razgl
Vol. and No.		Letnik 44, št. 1
Publication year		2005
Volume		str. 3-22
Language		slo
Abstract		Background. The functional integration (»binding«) of different brain areas, for example as a possible mechanism for stimulus perception, may be mediated by the synchronizing oscillatory activity of neuronal populations, which can be determined by electroencephalographic coherence analysis. Visuomotor integration in a visuomotor task requires functional cooperation between the motor and visual cortical areas. Unilateral limb movements are based on the activation of contralateral primary motor cortex and bilateral activation of premotor cortices. Aim. Our main aim was to introduce a new method of coherence analysis and to compare our results obtained using an established model of the visuomotor task with other comparable studies, thereby assessing the validity of this method. The changes in coherence and power spectra of the left and right hemispheres of the brain were then compared while the subjects performed the visuomotor task with the right or with the left hand. Hypothesis. It was assumed that the coherence between the visual and motor areas of the cortex would increase for the visuomotor task compared to the control tasks. It was also hypothesized that an increase in coherence and a decrease in the power spectrum while performing the task with the right hand would be greater in the left hemisphere and vice versa. Methods. 6 healthy, right-handed subjects were tested and their electroencephalograms were recorded while they performed 4 different tasks: a visuomotor task with the right and the left hand (which required good coordination between visual and motor brain areas), a visual task, a motor task and a visual and motor task (which required independent activation of the visual and motor areas). For coherence and spectral analysis, a special computer program was designed using Matlab software. (Abstract truncated at 2000 characters).
Summary		Izhodišče. Funkcijsko povezovanje raznih področij možganov (angl. binding), ki je lahko npr. mehanizem zaznave dražljajev, morda poteka prek sinhronizirane oscilirajoče aktivnosti nevronov, ki se jo da določiti z merjenjem elektroencefalografske koherence. Takšno povezovanje vidnih in motoričnih področij možganske skorje je lahko tudi osnova vidno-motorične integracije, ki jo zahteva izvajanje motoričnih nalog, vodenih z vidom. Pri gibih ene roke se aktivira primarna motorična možganska skorja predvsem v nasprotni polobli, premotorična polja pa so aktivna v obeh. Namen. Osnovni cilj raziskave je bil vpeljati metodo merjenja elektroencefalografske koherence. Izbrali smo model vidno-motorične naloge, ker je že dobro raziskan in je zato dobljene rezultate možno primerjati z drugimi ter tako preizkusiti veljavnost metode. Drugi cilj je bil primerjava sprememb koherence in močnostnih spektrov nad levo in desno možgansko poloblo pri izvajanju vidno-motorične naloge z desno ali z levo roko. Hipoteze. Predpostavili smo, da bo koherenca med vidnimi in motoričnimi področji možganske skorje večja med izvajanjem vidno-motorične naloge kot med kontrolnimi nalogami. Predpostavili smo tudi, da bo povečanje koherence pri izvajanju naloge z desnico večje nad levo poloblo in obratno. Metode. Meritve smo izvedli na 6 desničnih zdravih preiskovancih. Med elektroencefalografskim snemanjem so izvajali 4 naloge: vidno-motorično nalogo z levo in desno roko (zahtevala je usklajeno delovanje vidnih in motoričnih polj), vidno, motorično ter vidno in motorično (hkrati neodvisno aktivni obe polji). Za izračun sprememb koherence in močnostnih spektrov smo izdelali računalniški program v programskem okolju Matlab. Rezultate smo statistično obdelali z metodami dvosmerne in enosmerne analize variance ter s post hoc testi t s korekcijo po Bonferroniju. (Izvleček skrajšan pri 2000 znakih).
Descriptors		ELECTROENCEPHALOGRAPHY CORTICAL SYNCHRONIZATION VISUAL CORTEX MOTOR CORTEX ADULT ALPHA RHYTHM BETA RHYTHM