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Recently, the psychometric properties of two widely used neural measures in early childhood\u2014frontal alpha asymmetry and delta\u2013beta coupling\u2014have come under scrutiny. Despite their growing use, additional work examining how the psychometric properties of these neural signatures may change across infancy is needed. The current study examined the developmental stability, split\u2010half reliability, and construct validity of infant frontal alpha asymmetry and delta\u2013beta coupling. Infants provided resting\u2010state EEG data at 8, 12, and 18 months of age (<jats:italic>N<\/jats:italic>\u00a0=\u00a0213). Frontal alpha asymmetry and delta\u2013beta coupling showed significant developmental change from 8 to 18 months. Reliability for alpha asymmetry, and alpha, delta, and beta power, individually, was generally good. In contrast, the reliability of delta\u2013beta coupling scores was poor. Associations between frontal alpha asymmetry and approach tendencies generally emerged, whereas stronger (over\u2010coupled) delta\u2013beta coupling scores were associated with profiles of dysregulation and low inhibition. However, the individual associations varied across time and specific measures of interest. We discuss these findings with a developmental lens, highlighting the importance of repeated measures to better understand links between neural signatures and typical and atypical development.<\/jats:p>","DOI":"10.1002\/dev.22178","type":"journal-article","created":{"date-parts":[[2021,8,23]],"date-time":"2021-08-23T05:53:51Z","timestamp":1629698031000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Psychometric properties of infant electroencephalography: Developmental stability, reliability, and construct validity of frontal alpha asymmetry and delta\u2013beta coupling"],"prefix":"10.1002","volume":"63","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1629-4827","authenticated-orcid":false,"given":"Berenice","family":"Anaya","sequence":"first","affiliation":[{"name":"Department of Psychology Pennsylvania State University  University Park Pennsylvania 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