Sounds elicit relative left frontal alpha activity in 2-month-old infants |
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| Affiliation: | 1. Department of Psychology, Renmin University of China, Beijing 100872, China;2. Department of Child Health Care, Children''s Hospital Zhejiang University School of Medicine, Zhejiang 310003, China;3. Department of Human Development and Quantitative Methodology, University of Maryland, College Park, MD 20740, USA;4. Boston Children''s Hospital, Harvard Medical School, Boston, MA 02115, USA;5. Center for Human Growth and Development, University of Michigan, Ann Arbor, MI 48109, USA;6. Department of Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, MI 48109, USA;1. Okinaka Memorial Institute for Medical Research, Tokyo, Japan;2. Department of Endocrinology and Metabolism, Toranomon Hospital, Tokyo, Japan;3. Department of Pediatric Metabolism and Nutrition, Ege University Medical Faculty, Izmir, Turkey;4. Molecular Genetics and Metabolism Laboratory, Munich, Germany;1. Internal Medicine Department of, Hospital Virgen del Rocío, Sevilla, Spain;2. Internal Medicine Department of, Hospital Juan Ramón Jiménez, Huelva, Spain;3. Internal Medicine Department of, Hospital Royo Villanova, Zaragoza, Spain;4. Internal Medicine Department of, Hospital General de Alicante, Spain;5. Internal Medicine Department of, Hospital de la Axarquía, Málaga, Spain;6. Internal Medicine Department of, Hospital San Juan de Dios del Aljarafe, Sevilla, Spain |
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| Abstract: | As one kind of sounds, human voices are important for language acquisition and human–infant relations. Human voices have positive effects on infants, e.g., soothe infants and evoke an infant's smile. Increased left relative to right frontal alpha activity as assessed by the electroencephalogram (EEG) is considered to reflect approach-related emotions. In the present study, we recorded the EEG in thirty-eight 2-month-old infants during a baseline period while listening to sounds, i.e., human voices. Infants displayed increased relative left frontal alpha activity in response to sounds compared to the baseline condition. These results suggest that sounds can elicit relative left frontal activity in young infants, and that this approach-related emotion presents early in life. |
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