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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.


Eyes-open EEG power in the left hemisphere by frequency, region, and condition (T1 vs. T2).
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Figure 5: Eyes-open EEG power in the left hemisphere by frequency, region, and condition (T1 vs. T2).

Mentions: Similar to the EC condition, an omnibus 2 × 5 × 2 × 4 ANOVA of EO resting EEG power yielded main effects of measurement occasion, frequency, and region (ps < 0.01), and significant region by frequency, F(12,444) = 23.66, p < 0.001, = 0.39, and region by hemisphere, F(3,111) = 4.53, p < 0.02, = 0.11 interactions. Post-task EO EEG power was higher (T2: M = 0.43 μV, SE = 0.07), than pre-task power (T1: M = 0.25 μV, SE = 0.09; see Figures 5 and 6). Resting EO power was greater in the delta frequency band (M = 1.13 μV, SE = 0.09) than the other frequencies, ps < 0.001, and greater in mid-frontal (M = 0.66 μV, SE = 0.09), than the other regions, ps < 0.001, with no other effects or interactions, ps > 0.13. Like the EC condition, EO resting EEG power differed by frequency, and where and when it was measured, and exhibited a pattern that suggested significant asymmetry in mid-frontal alpha power.


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)

Eyes-open EEG power in the left hemisphere by frequency, region, and condition (T1 vs. T2).
© Copyright Policy
Related In: Results  -  Collection

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

Figure 5: Eyes-open EEG power in the left hemisphere by frequency, region, and condition (T1 vs. T2).
Mentions: Similar to the EC condition, an omnibus 2 × 5 × 2 × 4 ANOVA of EO resting EEG power yielded main effects of measurement occasion, frequency, and region (ps < 0.01), and significant region by frequency, F(12,444) = 23.66, p < 0.001, = 0.39, and region by hemisphere, F(3,111) = 4.53, p < 0.02, = 0.11 interactions. Post-task EO EEG power was higher (T2: M = 0.43 μV, SE = 0.07), than pre-task power (T1: M = 0.25 μV, SE = 0.09; see Figures 5 and 6). Resting EO power was greater in the delta frequency band (M = 1.13 μV, SE = 0.09) than the other frequencies, ps < 0.001, and greater in mid-frontal (M = 0.66 μV, SE = 0.09), than the other regions, ps < 0.001, with no other effects or interactions, ps > 0.13. Like the EC condition, EO resting EEG power differed by frequency, and where and when it was measured, and exhibited a pattern that suggested significant asymmetry in mid-frontal alpha power.

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.