Event related potentials (P300) of the auditory oddball task are widely used in clinical diagnosis, cognitive neuroscience, and brain-computer interfaces (BCIs). However, the connectivity and correlations between different brain regions have not been well investigated. This paper mainly explores the functional brain network during auditory oddball task. The results show that there are more connections between EEG electrodes during target stimuli than non-target stimuli. In addition, the brain network has significant difference in the left and right channel selective attention tasks. Additionally, the contralateral electrodes play crucial rule in selective attention for the right or left ear.
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