Evaluation of Oddball Cases: Single Trial EEG Connectivity Study Based on P300 and Motor Response

In this paper, the difference between two oddball cases: Target with Response (TR) and Non-target with Response (NTR); is evaluated in terms of functional connectivity. For statistical significance Pearson's Correlation method is used. The connectivity was estimated using coherence on single trial EEG data from a visual oddball paradigm. The pairwise coherence coefficient of all 19 electrodes was grouped into a 19×19 connectivity matrix for further analysis. The data of two subj ects was averaged to perform group comparisons between the two oddball cases. Absolute thresholding method was applied on the matrices to form undirected graphs. It is found that the connectivity matrix of TR is significantly different from NTR. Firstly the connectivity in TR case has higher weight than NTR case. Secondly TR case has higher network density value than NTR case. Lastly Frontal-Temporal (F - T) and Occipital-Temporal (O-T) links which are related to the triggering of P300 were observed in TR case but not in NTR case. It is also observed that Central-Parietal (C-P) and Parietal-Temporal (P-T) links are important for the motor response.