EEG and sLORETA: The Dichotic Listening test preliminary results

Abstract

Dichotic Listening (DL) paradigm which indicates the brain asymmetry behaviorally is a non-invasive neurocognitive method. Phonetic combinations are used in this method. During the DL paradigm, recently developed system is able to mark the time point on the continuous electroencephalography (EEG) at which the DL stimulus is applied to the person in real time. By applying this new method, DL paradigm, we can evaluate the event related potentials of each ear advantages. Also we can elucidate how auditory system processes the knowledge. In this preliminary study, the main aim was to apply the standardized “Low Resolution Electromagnetic Tomography“ (sLORETA) method to EEG data of DL paradigm. Secondly, sLORETA was applied to different ear advantage (heteronymous and homonymous) event related potentials (ERPs) as a new approach. The preliminary results indicate that for the heteronymous condition the activation found in the superior temporal gyrus in the early stages, moves to central frontal gyrus in the late stages. The differences between the conditions of heteronymous and homonymous arise in frontal activation in the late stages. These findings which indicate the spatial-temporal resolution of the brain's dynamic processing can be beneficial for the clinical applications.