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. 3 shows the bivariate relationships between the baseline arousal measures. 2-Tailed significance values are reported. Significant relationships were observed between the following pairs of variables: HV vs HR: r(27) = .48, p < .01; HV vs PA: r(29) = .54 p < .005; HR vs PA: r(27) = .44 p < .05; HR vs PS: r(26) = .49, p = .01. All other relationships were non-significant. In addition, an identical parallel comparison was conducted to examine how pupil size co-varied with other measures during the two baseline videos, when it was not possible to control for on-screen luminance. Pearson’s product-moment correlations suggested consistent but weaker and non-significant correlations between pupil size and: HV r = .28, HR r = .16, PA r = .19 and EDA r = .14.
Affiliation: Medical Research Council Cognition and Brain Sciences Unit, Cambridge, UK. Electronic address: email@example.com.