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- W2019903009 abstract "Representations in working memory (WM) are temporary, but can be refreshed for longer periods of time through maintenance mechanisms, thereby establishing their availability for subsequent memory tests. Frontal brain regions supporting WM maintenance operations undergo anatomical and functional changes with advancing age, leading to age related decline of memory functions. The present study focused on age-related functional connectivity changes of the frontal midline (FM) cortex in the theta band (4–8 Hz), related to WM maintenance. In the visual delayed-match-to-sample WM task young (18–26 years, N = 20) and elderly (60–71 years N = 16) adults had to memorize sample stimuli consisting of 3 or 5 items while 33 channel EEG recording was performed. The phase lag index was used to quantify connectivity strength between cortical regions. The low and high memory demanding WM maintenance periods were classified based on whether they were successfully maintained (remembered) or unsuccessfully maintained (unrecognized later). In the elderly reduced connectivity strength of FM brain region and decreased performance were observed. The connectivity strength between FM and posterior sensory cortices was shown to be sensitive to both increased memory demands and memory performance regardless of age. The coupling of frontal regions (midline and lateral) and FM-temporal cortices characterized successfully maintained trials and declined with advancing age. The findings provide evidence that a FM neural circuit of theta oscillations that serves a possible basis of active maintenance process is especially vulnerable to aging." @default.
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- W2019903009 date "2014-10-01" @default.
- W2019903009 modified "2023-10-15" @default.
- W2019903009 title "Frontal midline theta connectivity is related to efficiency of WM maintenance and is affected by aging" @default.
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- W2019903009 doi "https://doi.org/10.1016/j.nlm.2014.04.009" @default.
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