Electroencephalographic coherence,aging, and memory: distinct responses to background context and stimulus repetition in younger,older, and older declined groups |
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Authors: | Michael Hogan Peter Collins Michael Keane Liam Kilmartin Jochen Kaiser Joanne Kenney Robert Lai Neil Upton |
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Institution: | (1) School of Psychology, NUI, Galway, Ireland;(2) School of Engineering and Informatics, NUI, Galway, Ireland;(3) Institute of Medical Psychology, Johann Wolfgang Goethe-University, Frankfurt am Main, Germany;(4) Neurosciences CEDD, GlaxoSmithKline, Harlow, UK |
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Abstract: | The current study examines the EEG coherence of young, old, and old declined adults performing a visual paired-associates
task. In order to examine the effects of encoding context and stimulus repetition, target pairs were presented on either detailed
or white backgrounds and were repeatedly presented during both early and late phases of encoding. Younger adults were found
to have lower levels of frontal–temporal and temporal–parietal coherence, but higher levels of frontal–parietal coherence,
particularly for the gamma frequency band. A number of differential coherence responses to background context and early- versus
late-encoding phases were also observed across the groups, particularly for lower alpha and upper alpha frequencies. Coherence–performance
maps were generated to further explore topographical differences in the relationship between coherence and performance across
groups. Results revealed a more diffuse pattern of negative coherence–performance relations in older declined adults. Results
are discussed in light of the literature on age-related cognitive decline. |
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Keywords: | |
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