Tonic and phasic co-variation of peripheral arousal indices in infants.
Bottom Line: Tonic pupil size showed significant positive covariation, but phasic pupil changes were inconsistent.We conclude that: (i) there is high covariation between autonomic indices in infants, but that EDA may only be sensitive at extreme arousal levels, (ii) that tonic pupil size covaries with other indices, but does not show predicted patterns of phasic change and (iii) that motor activity appears to be a good proxy measure of ANS activity.The strongest patterns of covariation were observed using epoch durations of 40s per epoch, although significant covariation between indices was also observed using shorter epochs (1 and 5s).
Affiliation: Medical Research Council Cognition and Brain Sciences Unit, Cambridge, UK. Electronic address: firstname.lastname@example.org.Show MeSH
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Mentions: Fig. 4 shows the results of the initial analysis, based on 20-s epochs. Each datapoint on this graph represents the average correlation observed across epochs for an individual participant. For example, it can be seen that, in comparing heart rate and head velocity, correlations were consistently positive, suggesting that there is a positive relationship between those two measures. Conversely, consistently negative correlations would suggest a negative relationship between these two measures.
Affiliation: Medical Research Council Cognition and Brain Sciences Unit, Cambridge, UK. Electronic address: email@example.com.