Analysis of Brain Cognitive State for Arithmetic Task and Motor Task Using Electroencephalography Signal

To localize the brain dynamics for cognitive processes from EEG signature has been a challenging task from last two decades. In this paper we explore the spatial-temporal correlations of brain electrical neuronal activity for cognitive task such as Arithmetic and Motor Task using 3D cortical distribution method. Ten healthy right handed volunteers participated in the experiment. EEG signal was acquired during resting state with eyes open and eyes closed; performing motor task and arithmetic calculations.
The signal was then computed for three dimensional cortical distributions on realistic head model with MNI152 template using standardized low resolution brain electromagnetic tomography (sLORETA). This was followed by an appropriate standardization of the current density, producing images of electric neuronal activity without localization bias. Neuronal generators responsible for cognitive state such as Arithmetic Task and Motor Task were localized. The result was correlated with the revious neuroimaging (fMRI study) investigation. Hence our result directed that the neuronal activity from EEG signal can be demonstrated in cortical level with good spatial resolution. 3D cortical distribution method, thus, may be used to obtain both spatial and temporal information from EEG signal and may prove to be a significant technique to investigate the cognitive functions in mental health and brain dysfunctions. Also, it may be helpful for brain/human computer interfacing.