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. 5 shows the results of this analysis. A number of features can be seen. Firstly, head velocity, heart rate and peripheral accelerometry all significantly predict changes at both low and high arousal levels, as shown in Fig. 5, subplots a,b,e,f,i,j. (HV bin predicts HR (R2 = .035/.179 for low/high bins, both ps < .001) and PA (R2 = .013/.093, p = .001/<.001). HR bin predicts HV (R2 = .033/.151, both ps < .001) and PA (R2 = .026/.098, both ps < .001). PA bin predicts HV (R2 = .010/.079, p = .005/<.001) and HR (R2 = .045/.075, both ps < .001)).
Affiliation: Medical Research Council Cognition and Brain Sciences Unit, Cambridge, UK. Electronic address: email@example.com.