Quantitative EEG Signatures through Amplitude and Phase Modulation Patterns

Mark H Myers, Akaash Padmanabha

DOI: 10.4103/jmss.JMSS_72_16

Abstract


Cortical spatiotemporal signal patterns based on object recognition can be discerned from visualstimulation. These are in the form of amplitude modulation (AM) and phase modulation (PM) patterns,which contain perceptual information gathered from sensory input. A high-density Electroencephalograph(EEG) device consisting of 48 electrodes with a spacing of 5mm was utilized to measure frontallobe activity in order to capture event-related potentials from visual stimuli. Four randomized stimulirepresenting different levels of salient responsiveness were measured to determine if mild stimuli can bediscerned from more extreme stimuli. AM/PM response patterns were detected between mild and moresalient stimuli across participants. AM patterns presented distinct signatures for each stimulus. AMpatterns had the highest number of incidents detected in the middle of the frontal lobe. Through thiswork, we can expand our encyclopedia of neural signatures to object recognition, and provide a broaderunderstanding of quantitative neural responses to external stimuli. The results provide a quantitativeapproach utilizing spatiotemporal patterns to analyze where distinct AM patterns can be linked to objectperception.

Keywords


Analytic amplitude; analytic phase; frontal lobe; object saliency; spatio temporal patterns

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