Electroencephalography Changes during Change Blindness Disorder

BACKGROUND/OBJECTIVE: The electroencephalogram (EEG) is the process of recording electrical potentials produced by neurons in the brain. For understanding the neuro-physiological mechanism of various cognitive and neurological disorders, EEG has been proved a vital technique for many years. The change blindness which is incapability of brain to notice substantial visual changes is among such disorders. This study investigates the complexity in information process of EEG signals during the change blindness disorder using the two different measures called entropy and correlation dimension functions. METHODS: The EEG data of change blindness disorder was recorded from 22 subjects while they were performing change detection and change blindness trials for two types of stimuli. These were (1) single stimulus followed by another matching stimulus, (2) single stimulus followed by another non-matching stimulus. The measure of complexity in recorded EEG was estimated using both correlation dimension and approximate entropy functions. RESULTS: The results have shown significant decrease in values of approximate entropy and correlation dimension at frontal position of electrodes for change blindness trials. CONCLUSION: The neurophysiological implication of these results provide the possibility that the increase of brain complexity, which can be interpreted as increase of information process and integration, was not sustained in frontal position of brain during the change blindness disorder.