Synchronization Analysis of EEG Epilepsy by Visibility Network Graph and Cross-correlation

Epilepsy is a chronic neurological disorder affects people of all ages; this paper presents cross-correlation and state transfer network method to analyze synchronization between EEG data-channels from subjects with epilepsy seizures. The datasets are in two phases, preictal and ictal phase. All EEG segments are mapped into a corresponding state network graph to obtain the corresponding motifs and then the cross-correlation is applied to exhibit the synchronization changing during epilepsy seizures. The results showed that ictal phase presented high synchronization between channels, where low synchronization level is observed within preictal phase

Interhemispheric Correlation and Epileptic Seizures: Are They Related? A Preliminary Retrospective Study

Objectives: For the purpose of predicting seizure activities in focal temporal lobe epilepsy we examined interhemispheric correlation coefficients in pre-ictal EEG data

Effects of HIV on Neuroelectric Responses: AERP and EDA

WOS: 000422853200002Aim We aimed to test our hypothesis that electroencephalography (EEG) responses and electrodermal activity (EDA) in response to auditory stimuli in HIV/AIDS patients will differ to those of healthy individuals. Method Data was collected from 20 AIDS patients receiving anti retroviral treatment for an average duration of five years and 20 healthy individuals matched for age/sex. Participants were presented with auditory stimuli consisting of pure sound tones with 1000 Hz (non-target) and 2000 Hz (target) frequency. Frontal EEG and EDA recordings were taken using a biopotential amplifier system. Results P1, N1, P2, N2 (p<0.001) responses obtained from the frontal region to target stimuli were higher in HIV group; while the P3 response was higher in control group. The latencies of all responses to target stimuli were significantly delayed in HIV group compared to control group. In HIV group, amplitudes of P1, N2 and P3 responses to target stimuli were found to be higher than to non-target stimuli; N1 and P2 responses to non-target stimuli had higher amplitude. Conclusion The findings of this study demonstrate the effects of HIV on both the peripheral (EDA) and central nervous system (EEG). The differences in neuroelectrical activity found between HIV patients and healthy individuals can be concluded to be due to the direct or indirect effects of the virus and antiretroviral medication on neurons. The method of simultaneous monitoring of auditory ERP and EDA may contribute to the detection of subclinical neural deterioration in HIV patients

Auditory event-related potentials demonstrate early cognitive impairment in children with subclinical hypothyroidism

Background: The aim of this study was to examine the cognitive functions of children with subclinical hypothyroidism (SH) and healthy children with the use of auditory event-related potentials (AERPs) and neuropsychological tests