title: Variation in infant EEG power across social and nonsocial contexts.
abstract: To understand the infant social brain, it is critical to observe functional neural activation during social interaction. Yet many infant electroencephalography (EEG) studies on socioemotional development have recorded neural activity only during a baseline state. This study investigated how infant EEG power (4-6Hz and 6-9Hz) varies across social and nonsocial contexts. EEG was recorded in 12-month-olds across controlled conditions to disentangle the neural bases of social interactions. Four conditions-nonsocial, joint attention, language-only, and social engagement-were designed to tease apart how different environmental inputs relate to infant EEG power. We analyzed EEG power in frontal, central, temporal, and parietal regions. During the joint attention condition compared with the other conditions, 4-6Hz frontal, central, and parietal power was lowest, indexing greater neural activation. There was lower 4-6Hz and 6-9Hz power in the temporal region in both the joint attention and social engagement conditions compared with the nonsocial condition. In 6-9Hz, the pattern was consistent with 4-6Hz findings for the frontal region such that 6-9Hz frontal power was lower, indexing greater neural activation, in the joint attention condition compared with the nonsocial condition. There were no differences between conditions in central and parietal regions in 6-9Hz. Findings highlight the methodological importance of recording functional brain activity in multiple controlled contexts to explicate the neural bases of the infant social brain.
authors: Department of Psychological and Brain Sciences, Boston University, Boston, MA 02215, USA. Electronic address: astjohn@bu.edu.
authors: Ashley M
authors: AM
authors: St John
authors: Department of Psychological and Brain Sciences, Boston University, Boston, MA 02215, USA.
authors: Katie
authors: K
authors: Kao
authors: Department of Psychology, New York University, New York, NY 10003, USA.
authors: Maitreyi
authors: M
authors: Choksi
authors: Department of Psychological and Brain Sciences, Boston University, Boston, MA 02215, USA.
authors: Jacqueline
authors: J
authors: Liederman
authors: Department of Pediatrics, Columbia University Medical Center, New York, NY 10032, USA.
authors: Philip G
authors: PG
authors: Grieve
authors: Department of Psychological and Brain Sciences, Boston University, Boston, MA 02215, USA.
authors: Amanda R
authors: AR
authors: Tarullo
mesh_terms: D000328:Adult; D002540:Cerebral Cortex / Q000502:physiology*; D004569:Electroencephalography; D005260:Female; D006801:Humans; D007223:Infant; D007398:Interpersonal Relations; D008297:Male; D009034:Mother-Child Relations; D055815:Young Adult
keywords: EEG; EEG power; Infant; Joint attention; Social brain; Social engagement