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It is unclear whether these responses extend to positive affect and whether observing peer emotions motivates infants\u2019 behaviors. This study investigates 8-month-olds\u2019 asymmetric frontal EEG during peers\u2019 cry and laughter, and its relation to approach and withdrawal behaviors. Participants observed videos of infant crying or laughing during two separate sessions. Frontal EEG alpha power was recorded during the first, while infants\u2019 behaviors and emotional expressions were recorded during the second session. Facial and vocal expressions of affect suggest that infants converge emotionally with their peers\u2019 distress, and, to a certain extent, with their happiness. At group level, the crying peer elicited right lateralized frontal activity. However, those infants with reduced right and increased left frontal activity in this situation, were more likely to approach their peer. Overall, 8-month-olds did not show asymmetric frontal activity in response to peer laughter. But, those infants who tended to look longer at their happy peer were more likely to respond with left lateralized frontal activity. The link between variations in left frontal activity and simple approach behaviors indicates the presence of a motivational dimension to infants\u2019 responses to distressed peers.<\/jats:p>","DOI":"10.1038\/s41598-018-35219-4","type":"journal-article","created":{"date-parts":[[2018,11,15]],"date-time":"2018-11-15T10:36:10Z","timestamp":1542278170000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Eight-month-old infants\u2019 behavioral responses to peers\u2019 emotions as related to the asymmetric frontal cortex activity"],"prefix":"10.1038","volume":"8","author":[{"given":"Maria M.","family":"Crespo-Llado","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ross","family":"Vanderwert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3525-9015","authenticated-orcid":false,"given":"Elisa","family":"Roberti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0398-8398","authenticated-orcid":false,"given":"Elena","family":"Geangu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2018,11,21]]},"reference":[{"key":"35219_CR1","doi-asserted-by":"publisher","first-page":"1168","DOI":"10.2307\/1130613","volume":"58","author":"GW Ladd","year":"1987","unstructured":"Ladd, G. 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