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Regional electroencephalogram (EEG) alpha power and asymmetry in older adults: a study of short-term test-retest reliability.

Mathewson KJ, Hashemi A, Sheng B, Sekuler AB, Bennett PJ, Schmidt LA - Front Aging Neurosci (2015)

Bottom Line: Pearson and intra-class correlations indicated acceptable test-retest reliability for alpha power and asymmetry measures in all regions.Interestingly, alpha asymmetry appeared to be less affected by the task than was alpha power.Findings suggest that alpha asymmetry may reflect more enduring, "trait-like" characteristics, while alpha power may reflect more "state-like" processes in older adults.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, Neuroscience and Behaviour, McMaster University Hamilton, ON, Canada.

ABSTRACT
Although regional alpha power and asymmetry measures have been widely used as indices of individual differences in emotional processing and affective style in younger populations, there have been relatively few studies that have examined these measures in older adults. Here, we examined the short-term test-retest reliability of resting regional alpha power (7.5-12.5 Hz) and asymmetry in a sample of 38 active, community-dwelling older adults (M age = 71.2, SD = 6.5 years). Resting electroencephalogram recordings were made before and after a perceptual computer task. Pearson and intra-class correlations indicated acceptable test-retest reliability for alpha power and asymmetry measures in all regions. Interestingly, alpha asymmetry appeared to be less affected by the task than was alpha power. Findings suggest that alpha asymmetry may reflect more enduring, "trait-like" characteristics, while alpha power may reflect more "state-like" processes in older adults.

No MeSH data available.


Overall EEG alpha power in the eyes-closed and eyes-open conditions was greater at T2 than T1, and greater in the frontal right hemisphere than the left.
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Figure 7: Overall EEG alpha power in the eyes-closed and eyes-open conditions was greater at T2 than T1, and greater in the frontal right hemisphere than the left.

Mentions: Alpha asymmetry is most commonly analyzed at frontal (prefrontal, mid-frontal, lateral-frontal), and some posterior (e.g., parietal) sites. Therefore, measures of resting alpha asymmetry from six regions (prefrontal, mid-frontal, lateral-frontal, central, parietal, occipital) were selected and submitted to a 2 × 2 × 6 (EC vs. EO condition by measurement occasion by region) ANOVA. The analysis revealed only a main effect of region, F(5,185) = 3.20, p < 0.04, = 0.08, with no other effects or interactions, p > 0.15. Pairwise tests indicated that mid-frontal asymmetry (M = 0.14 μV, SE = 0.05) was greater than alpha asymmetry at all other sites (all ps < 0.03, except the lateral frontal region (M = 0.08 μV, SE = 0.04), p < 0.07; see Figure 7). The magnitude of parietal asymmetry (M = -0.07 μV, SE = 0.05) did not differ from than that of central (M = -0.04 μV, SE = 0.06), or occipital asymmetry (M = -0.04 μV, SE = 0.04), ps > 0.50, but was significantly lower than that of lateral frontal asymmetry, p < 0.05. To test whether any of the asymmetry values differed significantly from zero, regional asymmetry values at each site were collapsed across the EC and EO conditions and entered in one-sample t-tests. Only mid-frontal asymmetry at T1 and T2, ps < 0.03, and lateral-frontal asymmetry at T2, p < 0.04, differed significantly from zero (all other ps > 0.09).


Regional electroencephalogram (EEG) alpha power and asymmetry in older adults: a study of short-term test-retest reliability.

Mathewson KJ, Hashemi A, Sheng B, Sekuler AB, Bennett PJ, Schmidt LA - Front Aging Neurosci (2015)

Overall EEG alpha power in the eyes-closed and eyes-open conditions was greater at T2 than T1, and greater in the frontal right hemisphere than the left.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4584992&req=5

Figure 7: Overall EEG alpha power in the eyes-closed and eyes-open conditions was greater at T2 than T1, and greater in the frontal right hemisphere than the left.
Mentions: Alpha asymmetry is most commonly analyzed at frontal (prefrontal, mid-frontal, lateral-frontal), and some posterior (e.g., parietal) sites. Therefore, measures of resting alpha asymmetry from six regions (prefrontal, mid-frontal, lateral-frontal, central, parietal, occipital) were selected and submitted to a 2 × 2 × 6 (EC vs. EO condition by measurement occasion by region) ANOVA. The analysis revealed only a main effect of region, F(5,185) = 3.20, p < 0.04, = 0.08, with no other effects or interactions, p > 0.15. Pairwise tests indicated that mid-frontal asymmetry (M = 0.14 μV, SE = 0.05) was greater than alpha asymmetry at all other sites (all ps < 0.03, except the lateral frontal region (M = 0.08 μV, SE = 0.04), p < 0.07; see Figure 7). The magnitude of parietal asymmetry (M = -0.07 μV, SE = 0.05) did not differ from than that of central (M = -0.04 μV, SE = 0.06), or occipital asymmetry (M = -0.04 μV, SE = 0.04), ps > 0.50, but was significantly lower than that of lateral frontal asymmetry, p < 0.05. To test whether any of the asymmetry values differed significantly from zero, regional asymmetry values at each site were collapsed across the EC and EO conditions and entered in one-sample t-tests. Only mid-frontal asymmetry at T1 and T2, ps < 0.03, and lateral-frontal asymmetry at T2, p < 0.04, differed significantly from zero (all other ps > 0.09).

Bottom Line: Pearson and intra-class correlations indicated acceptable test-retest reliability for alpha power and asymmetry measures in all regions.Interestingly, alpha asymmetry appeared to be less affected by the task than was alpha power.Findings suggest that alpha asymmetry may reflect more enduring, "trait-like" characteristics, while alpha power may reflect more "state-like" processes in older adults.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, Neuroscience and Behaviour, McMaster University Hamilton, ON, Canada.

ABSTRACT
Although regional alpha power and asymmetry measures have been widely used as indices of individual differences in emotional processing and affective style in younger populations, there have been relatively few studies that have examined these measures in older adults. Here, we examined the short-term test-retest reliability of resting regional alpha power (7.5-12.5 Hz) and asymmetry in a sample of 38 active, community-dwelling older adults (M age = 71.2, SD = 6.5 years). Resting electroencephalogram recordings were made before and after a perceptual computer task. Pearson and intra-class correlations indicated acceptable test-retest reliability for alpha power and asymmetry measures in all regions. Interestingly, alpha asymmetry appeared to be less affected by the task than was alpha power. Findings suggest that alpha asymmetry may reflect more enduring, "trait-like" characteristics, while alpha power may reflect more "state-like" processes in older adults.

No MeSH data available.