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Spatio-temporal brain dynamics of self-identity: an EEG source analysis of the current and past self

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Current research on self-identity suggests that the self is settled in a unique mental representation updated across the lifespan in autobiographical memory. Spatio-temporal brain dynamics of these cognitive processes are poorly understood. ERP studies revealed early (N170-N250) and late (P3-LPC) waveforms modulations tracking the temporal processing of global face confguration, familiarity processes, and access to autobiographical contents. Neuroimaging studies revealed that such processes encompass face-specifc regions of the occipitotemporal cortex, and medial cortical regions tracing the self-identity into autobiographical memory across the life span. The present study combined both approaches, analyzing brain source power using a data-driven, beamforming approach. Face recognition was used in two separate tasks: identity (self, close friend and unknown) and life stages (childhood, adolescence, adulthood) recognition. The main areas observed were specifc-face areas (fusiform area), autobiographical memory areas (medial prefrontal cortex, parahippocampus, posterior cingulate cortex/precuneus), along with executive areas (dorsolateral prefrontal and anterior temporal cortices). The cluster-permutation test yielded no signifcant early efects (150–200 ms). However, during the 250–300 ms time window, the precuneus and the fusiform cortices exhibited larger activation to familiar compared to unknown faces, regardless of life stages. Subsequently (300–600 ms), the medial prefrontal cortex discriminates between self-identity vs. close-familiar and unknown. Moreover, signifcant efects were found in the cluster-permutation test specifcally on self-identity discriminating between adulthood from adolescence and childhood. These fndings suggest that recognizing self-identity from other facial identities (diachronic self) comprises the temporal coordination of anterior and posterior areas. While mPFC maintained an updated representation of self-identity (diachronic self) based on actual rewarding value, the dlPFC, FG, MTG, paraHC, PCC was sensitive to diferent life stages of self-identity (synchronic self) during the access to autobiographical memory
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