Age-related changes of frontal-midline theta is predictive of efficient memory maintenance

Kardos, Zsófia; Tóth, Brigitta; Boha, Roland; File, Bálint; Molnár, Mihály

doi:10.1016/j.neuroscience.2014.04.071

Cited by 51 publications

(43 citation statements)

References 51 publications

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“…By contrast, alpha and beta desynchronization was greater for the old than the young but did not support memory performance. These results are consistent with findings from short-term memory tasks showing age-related decreases in theta synchronization (Kardos, Toth, Boha, File, & Molnar, 2014; Karrasch, Laine, Rapinoja, & Krause, 2004) and increases in alpha and beta power during memory task performance (Karrasch et al, 2004; Sebastian & Ballesteros, 2012), in both encoding and retrieval. It is important to note that these studies assessed stimulus-induced changes in oscillatory power relative to baseline but did not compare oscillatory power for successful and unsuccessful memory trials (i.e., subsequent memory and old-new effects).…”

Section: Introductionsupporting

confidence: 91%

Age-related changes in neural oscillations supporting context memory retrieval

Strunk

James

Arndt

et al. 2017

Cortex

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Recent evidence suggests that directing attention toward single item-context associations during encoding improves young and older adults’ context memory performance and reduces demands on executive functions during retrieval. In everyday situations, there are many event features competing for our attention, and our ability to successfully recover those details may depend on our ability to ignore others. Failures of selective attention may contribute to older adults’ context memory impairments. In the current electroencephalogram (EEG) study, we assessed the effects of age on processes supporting successful context memory retrieval of selectively attended features as indexed by neural oscillations. During encoding, young and older adults were directed to attend to a picture of an object and its relationship to one of two concurrently presented contextual details: a color or scene. At retrieval, we tested their memory for the object, its attended and unattended context features, and their confidence for both the attended and unattended features. Both groups showed greater memory for attended than unattended contextual features. However, older adults showed evidence of hyper-binding between attended and unattended context features while the young adults did not. EEG results in the theta band suggest that young and older adults recollect similar amounts of information but brain-behavior correlations suggest that this information was supportive of contextual memory performance, particularly for young adults. By contrast, sustained beta desynchronization, indicative of sensory reactivation and episodic reconstruction, was correlated with contextual memory performance for older adults only. We conclude that older adults’ inhibition deficits during encoding reduced the selectivity of their contextual memories, which led to reliance on executive functions like episodic reconstruction to support successful memory retrieval.

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Section: Introductionsupporting

confidence: 91%

Age-related changes in neural oscillations supporting context memory retrieval

Strunk

James

Arndt

et al. 2017

Cortex

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“…Similarly, MEG evidence suggests that increased stimulus-related theta power preceding encoding predicts relational binding success for the young but not the old in a short-term memory task (Rondina et al, 2015). These results are consistent with findings from short-term memory tasks showing agerelated decreases in theta synchronization (Kardos, Toth, Boha, File, & Molnar, 2014;Karrasch, Laine, Rapinoja, & Krause, 2004). It is important to note that these studies assessed stimulusinduced changes in oscillatory power relative to baseline but did not compare oscillatory power for successful and unsuccessful memory trials.…”

Section: Introductionsupporting

confidence: 86%

Pre-stimulus oscillatory activity predicts successful episodic encoding for both young and older adults

Strunk¹,

Duarte²

2018

Preprint

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Healthy aging is associated with declines in episodic memory performance that are due in part to deficits in encoding. Emerging results from young adult studies suggest that the neural activity during the time-period preceding stimulus presentation is sensitive to episodic memory performance. It is unknown whether age-related declines in episodic memory are due solely to changes in the recruitment of processes elicited by stimuli during encoding or also in processes recruited in anticipation of these stimuli. Here, we recorded oscillatory EEG while young and old participants encoded visual and auditory words that were preceded by cues indicating the stimulus modality. Alpha oscillatory activity preceding and following stimulus onset was predictive of subsequent memory accuracy similarly across age. Frontal beta oscillations linked to semantic elaboration during encoding were reduced by age. Post-stimulus theta power was positively predictive of episodic memory accuracy for old but not young adults, potentially reflecting older adults' tendency to self-generate associations during encoding. Collectively, these results suggest that the preparatory mobilization of neural processes prior to encoding that benefits episodic memory performance is not affected by age.

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“…These may indicate that the activity in the frontal midline region was tightly correlated with the limited amount of information that could be stored in WM, which conforms to the results of EEG studies [11]. Besides, the capacity-constrained responses of causal flow were only observed in Fz, which indicated that the frontal midline region plays an important role in the WM network, as the source of propagating activity.…”

Section: Discussionsupporting

confidence: 83%

How networked brain changes when working memory load reaches the capacity?

Zhang

Tian

2015

2015 7th International IEEE/EMBS Conference on Neural Engineering (NER)

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Evidence from behavioral studies has suggested a capacity existed in working memory (WM). As functional connectivity in brain network has been introduced into research field of WM mechanism, the aim of this study is to investigate what happens in functional connectivity and causal flow in networked brain while WM load reaches the capacity. 32-channel electroencephalography (EEGs) was recorded from 8 healthy subjects while they performed a visual working memory task with load 1-6. Short-time Fourier transform was used to determine the principal frequency range (theta) during WM. Functional connectivity among theta components of EEGs was estimated by directed transform function (DTF). Information transform was described by causal flow. The results averaged in 10 trials for each subject show that the connectivity strength increased with load increasing from 1 to 4, peaked at load 4, and decreased after the load reached 4. The causal flow with source Fz showed the similar tendency as DTF. These findings could lead to improve understanding the capacity-related neural mechanism in WM from the view of functional connection and causal flow in the networked brain.

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Age-related changes of frontal-midline theta is predictive of efficient memory maintenance

Cited by 51 publications

References 51 publications

Age-related changes in neural oscillations supporting context memory retrieval

Age-related changes in neural oscillations supporting context memory retrieval

Pre-stimulus oscillatory activity predicts successful episodic encoding for both young and older adults

How networked brain changes when working memory load reaches the capacity?

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