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Tonic and phasic co-variation of peripheral arousal indices in infants.

Wass SV, de Barbaro K, Clackson K - Biol Psychol (2015)

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).

View Article: PubMed Central - PubMed

Affiliation: Medical Research Council Cognition and Brain Sciences Unit, Cambridge, UK. Electronic address: samwass@gmail.com.

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Co-variation of phasic changes in arousal across measures. All data available across the entire 20-min testing session was epoched into 20-s segments (approximately 60 epochs per individual). For each possible pairwise combination of variables, the rank order correlation between those measures was calculated across all epochs available for that participant. Individual dots on the scatterplots show, participant by participant, the rank order correlation observed between that pair of variables. Consistently positive (>0) correlations suggest a positive relationship between variables. In order to assess whether the correlations observed across all individuals differ significantly from zero, a one-sample t-test was calculated. The mean correlations observed (μ) and the significance levels (p) of these tests are shown in red. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
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fig0020: Co-variation of phasic changes in arousal across measures. All data available across the entire 20-min testing session was epoched into 20-s segments (approximately 60 epochs per individual). For each possible pairwise combination of variables, the rank order correlation between those measures was calculated across all epochs available for that participant. Individual dots on the scatterplots show, participant by participant, the rank order correlation observed between that pair of variables. Consistently positive (>0) correlations suggest a positive relationship between variables. In order to assess whether the correlations observed across all individuals differ significantly from zero, a one-sample t-test was calculated. The mean correlations observed (μ) and the significance levels (p) of these tests are shown in red. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

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.


Tonic and phasic co-variation of peripheral arousal indices in infants.

Wass SV, de Barbaro K, Clackson K - Biol Psychol (2015)

Co-variation of phasic changes in arousal across measures. All data available across the entire 20-min testing session was epoched into 20-s segments (approximately 60 epochs per individual). For each possible pairwise combination of variables, the rank order correlation between those measures was calculated across all epochs available for that participant. Individual dots on the scatterplots show, participant by participant, the rank order correlation observed between that pair of variables. Consistently positive (>0) correlations suggest a positive relationship between variables. In order to assess whether the correlations observed across all individuals differ significantly from zero, a one-sample t-test was calculated. The mean correlations observed (μ) and the significance levels (p) of these tests are shown in red. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
© Copyright Policy - CC BY-NC-ND
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4645095&req=5

fig0020: Co-variation of phasic changes in arousal across measures. All data available across the entire 20-min testing session was epoched into 20-s segments (approximately 60 epochs per individual). For each possible pairwise combination of variables, the rank order correlation between those measures was calculated across all epochs available for that participant. Individual dots on the scatterplots show, participant by participant, the rank order correlation observed between that pair of variables. Consistently positive (>0) correlations suggest a positive relationship between variables. In order to assess whether the correlations observed across all individuals differ significantly from zero, a one-sample t-test was calculated. The mean correlations observed (μ) and the significance levels (p) of these tests are shown in red. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
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.

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).

View Article: PubMed Central - PubMed

Affiliation: Medical Research Council Cognition and Brain Sciences Unit, Cambridge, UK. Electronic address: samwass@gmail.com.

Show MeSH
Related in: MedlinePlus