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Infancy. 2017 Mar-Apr;22(2):150-170. doi: 10.1111/infa.12164. Epub 2016 Sep 14.

Intraindividual and Interindividual Differences in Spontaneous Eye Blinking: Relationships to Working Memory Performance and Frontal EEG Asymmetry.

Infancy : the official journal of the International Society on Infant Studies

Leigh F Bacher, Shirley Retz, Courtney Lindon, Martha Ann Bell

PMID: 28286427 PMCID: PMC5343288 DOI: 10.1111/infa.12164

Abstract

The rate and timing of spontaneous eye blinking (SB) may be used to explore mechanisms of cognitive activity in infancy. In particular, SB rate is believed to reflect some dimensions of dopamine function; therefore, we hypothesized that SB rate would relate to working memory performance and to frontal electroencephalogram (EEG) asymmetry. Forty, 10-mo-old infants completed an A-not-B task while SB and EEG were measured throughout. We found that SB rate varied across phases of the task, variability in SB rate was positively related to working memory performance, and frontal EEG asymmetry was related to individual differences in the rate of SB. Results provide indirect, but convergent support for the hypothesis that SB rate reflects dopamine function early in human development. As such, these results have implications for understanding the tonic and phasic effects of dopamine on cognitive activity early in human development.

Keywords: attention; dopamine; frontal EEG asymmetry; infancy; spontaneous eye blinking; working memory

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