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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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Related in: MedlinePlus

An illustration of the raw data obtained from a single infant viewing the testing battery, which typically lasted approximately 20 min. The top plot shows the viewing materials being presented (see Section 3). The plots below show the raw (unprocessed) data obtained for (top to bottom): heart rate (units are beats per min), head velocity (internal units), EDA (μV), peripheral accelerometer (internal units), pupil size (mm).
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fig0005: An illustration of the raw data obtained from a single infant viewing the testing battery, which typically lasted approximately 20 min. The top plot shows the viewing materials being presented (see Section 3). The plots below show the raw (unprocessed) data obtained for (top to bottom): heart rate (units are beats per min), head velocity (internal units), EDA (μV), peripheral accelerometer (internal units), pupil size (mm).

Mentions: The battery lasted approximately 20 min per participant (see Fig. 1) and involved static images and infant-appropriate animations and TV clips. It was generally presented unbroken in one block, although if the infant had become distressed a break was taken during testing and the battery re-commenced. Viewing materials consisted of: (i) five television clips taken from infant- and child-directed BBC television programs; (ii) two clips of smiling infants and two clips of crying infants; (iii) five blocks of a sequence learning task; (iv) three blocks of a familiarisation and visual paired comparison task; (v) three blocks of a reversal learning task; (vi) a series of calibration and pupil size checks. Subsequent analyses will examine arousal changes relative to different cognitive tasks. The present analyses focus on the degree to which changes in one arousal index tended to be associated with changes in another, and have therefore been conducted on data pooled across all tasks.


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

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

An illustration of the raw data obtained from a single infant viewing the testing battery, which typically lasted approximately 20 min. The top plot shows the viewing materials being presented (see Section 3). The plots below show the raw (unprocessed) data obtained for (top to bottom): heart rate (units are beats per min), head velocity (internal units), EDA (μV), peripheral accelerometer (internal units), pupil size (mm).
© Copyright Policy - CC BY-NC-ND
Related In: Results  -  Collection

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

fig0005: An illustration of the raw data obtained from a single infant viewing the testing battery, which typically lasted approximately 20 min. The top plot shows the viewing materials being presented (see Section 3). The plots below show the raw (unprocessed) data obtained for (top to bottom): heart rate (units are beats per min), head velocity (internal units), EDA (μV), peripheral accelerometer (internal units), pupil size (mm).
Mentions: The battery lasted approximately 20 min per participant (see Fig. 1) and involved static images and infant-appropriate animations and TV clips. It was generally presented unbroken in one block, although if the infant had become distressed a break was taken during testing and the battery re-commenced. Viewing materials consisted of: (i) five television clips taken from infant- and child-directed BBC television programs; (ii) two clips of smiling infants and two clips of crying infants; (iii) five blocks of a sequence learning task; (iv) three blocks of a familiarisation and visual paired comparison task; (v) three blocks of a reversal learning task; (vi) a series of calibration and pupil size checks. Subsequent analyses will examine arousal changes relative to different cognitive tasks. The present analyses focus on the degree to which changes in one arousal index tended to be associated with changes in another, and have therefore been conducted on data pooled across all tasks.

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