Mothers' pupillary responses to infant facial expressions.

Behav Brain Funct · 2017 · PMC5292805 · PMID 28166792

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a clear trendno p-value reported

In the current study, stimuli in different emotion categories were not significantly different with respect to their mean (bitmap) intensity values, but there was a clear trend for both within- and between-category variability.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.