Resting state glutamate predicts elevated pre-stimulus alpha during self-relatedness: A combined EEG-MRS study on "rest-self overlap". (3rd May 2016)

• Record Type: Journal Article
• Authors: Bai, Yu; Nakao, Takashi; Xu, Jiameng; Qin, Pengmin; Chaves, Pedro; Heinzel, Alexander; Duncan, Niall; Lane, Timothy; Yen, Nai-Shing; Tsai, Shang-Yueh; Northoff, Georg
• Is Part Of: Social neuroscience. Volume 11:Number 3(2016)
• Page Start: 249
• Page End: 263
• Publication Date: 2016-05-03
• Subjects: Self-referential processing -- Perigenual anterior cingulate cortex -- MRS -- EEG -- Glutamine; Neurosciences -- Social aspects -- Periodicals; Neuropsychology -- Periodicals; Social psychology -- Periodicals; Social interaction -- Periodicals; 612.8
• DOI: 10.1080/17470919.2015.1072582
• Languages: English
• ISSNs: 1747-0919

Abstract

Abstract : Recent studies have demonstrated neural overlap between resting state activity and self-referential processing. This "rest-self" overlap occurs especially in anterior cortical midline structures like the perigenual anterior cingulate cortex (PACC). However, the exact neurotemporal and biochemical mechanisms remain to be identified. Therefore, we conducted a combined electroencephalography (EEG)-magnetic resonance spectroscopy (MRS) study. EEG focused on pre-stimulus (e.g., prior to stimulus presentation or perception) power changes to assess the degree to which those changes can predict subjects' perception (and judgment) of subsequent stimuli as high or low self-related. MRS measured resting state concentration of glutamate, focusing on PACC. High pre-stimulus (e.g., prior to stimulus presentation or perception) alpha power significantly correlated with both perception of stimuli judged to be highly self-related and with resting state glutamate concentrations in the PACC. In sum, our results show (i) pre-stimulus (e.g., prior to stimulus presentation or perception) alpha power and resting state glutamate concentration to mediate rest-self overlap that (ii) dispose or incline subjects to assign high degrees of self-relatedness to perceptual stimuli.