Parietal EEG alpha suppression time of memory retrieval reflects memory load while the alpha power of memory maintenance is a composite of the visual process according to simultaneous and successive Sternberg memory tasks

Okuhata, Shiho; Kusanagi, Takuya; Kobayashi, Tetsuo

doi:10.1016/j.neulet.2013.09.010

Cited by 12 publications

(25 citation statements)

References 22 publications

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“…Similarly, in another study alpha activity increased with load in right posterior channels but decreased in all other channels (Pavlov and Kotchoubey, 2017). Finally, Okuhata et al (2013) found that alpha modulation depended on the type of stimulus presentation.…”

Section: Alphamentioning

confidence: 68%

“…Okuhata et al (2013) directly compared the two types of presentation and reported a step-wise increase of alpha in the successive presentation condition, but a decrease in the simultaneous presentation condition. In line with Okuhata et al (2013), another group of authors also suggested that alpha activity mainly occurs in the tasks requiring maintenance of simultaneously presented information (Hsieh et al, 2011). We found that almost a half (17/35) of the studies used successive presentation and other 17 used simultaneous presentation.…”

Section: Alphamentioning

confidence: 99%

“…We found that almost a half (17/35) of the studies used successive presentation and other 17 used simultaneous presentation. The above-mentioned study of Okuhata et al (2013) compared both presentation types. Using only 21 studies yielding unambiguous findings, we found no significant difference in the direction of alpha modulation between simultaneous (11/13 showed an increase) and successive (5/8 showed an increase) presentation (χ 2 = 1.34, p =0.25).…”

Section: Alphamentioning

confidence: 99%

See 2 more Smart Citations

Oscillatory brain activity and maintenance of verbal and visual working memory: a systematic review

Pavlov¹,

Kochoubey²

2020

Preprint

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Section: Alphamentioning

confidence: 68%

Section: Alphamentioning

confidence: 99%

Section: Alphamentioning

confidence: 99%

See 1 more Smart Citation

Oscillatory brain activity and maintenance of verbal and visual working memory: a systematic review

Pavlov¹,

Kochoubey²

2020

Preprint

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“…In contrast, in a recent study, Okuhata et al . () reported positive and negative changes in α‐power in parietal cortex with successive vs. simultaneous versions of a Sternberg task, respectively. Examining human intracranial EEG recordings, Meltzer et al .…”

Section: Introductionmentioning

confidence: 98%

Spectrotemporal dynamics of the EEG during working memory encoding and maintenance predicts individual behavioral capacity

Bashivan

Bidelman

Yeasin

2014

Eur J of Neuroscience

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We investigated the effect of memory load on encoding and maintenance of information in working memory. Electroencephalography (EEG) signals were recorded while participants performed a modified Sternberg visual memory task. Independent component analysis (ICA) was used to factorise the EEG signals into distinct temporal activations to perform spectrotemporal analysis and localisation of source activities. We found 'encoding' and 'maintenance' operations were correlated with negative and positive changes in α-band power, respectively. Transient activities were observed during encoding of information in the bilateral cuneus, precuneus, inferior parietal gyrus and fusiform gyrus, and a sustained activity in the inferior frontal gyrus. Strong correlations were also observed between changes in α-power and behavioral performance during both encoding and maintenance. Furthermore, it was also found that individuals with higher working memory capacity experienced stronger neural oscillatory responses during the encoding of visual objects into working memory. Our results suggest an interplay between two distinct neural pathways and different spatiotemporal operations during the encoding and maintenance of information which predict individual differences in working memory capacity observed at the behavioral level.

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“…Okuhata et al (2013) reported positive and negative changes in spectral power (increase and decrease) of the alpha band in the parietal cortex with successive versus simultaneous versions of the Sternberg task, respectively.…”

Section: Introductionmentioning

confidence: 99%

Memory load effect in auditory–verbal short-term memory task: EEG fractal and spectral analysis

et al. 2015

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The objective of this preliminary study was to quantify changes in complexity of EEG using fractal dimension (FD) alongside linear methods of spectral power, event-related spectral perturbations, coherence, and source localization of EEG generators for theta (4-7 Hz), alpha (8-12 Hz), and beta (13-23 Hz) frequency bands due to a memory load effect in an auditory-verbal short-term memory (AVSTM) task for words. We examined 20 healthy individuals using the Sternberg's paradigm with increasing memory load (three, five, and seven words). The stimuli were four-letter words. Artifact-free 5-s EEG segments during retention period were analyzed. The most significant finding was the increase in FD with the increase in memory load in temporal regions T3 and T4, and in parietal region Pz, while decrease in FD with increase in memory load was registered in frontal midline region Fz. Results point to increase in frontal midline (Fz) theta spectral power, decrease in alpha spectral power in parietal region-Pz, and increase in beta spectral power in T3 and T4 region with increase in memory load. Decrease in theta coherence within right hemisphere due to memory load was obtained. Alpha coherence increased in posterior regions with anterior decrease. Beta coherence increased in fronto-temporal regions. Source localization delineated theta activity increase in frontal midline region, alpha decrease in superior parietal region, and beta increase in superior temporal gyrus with increase in memory load. In conclusion, FD as a nonlinear measure may serve as a sensitive index for quantifying dynamical changes in EEG signals during AVSTM tasks.

show abstract

Parietal EEG alpha suppression time of memory retrieval reflects memory load while the alpha power of memory maintenance is a composite of the visual process according to simultaneous and successive Sternberg memory tasks

Cited by 12 publications

References 22 publications

Oscillatory brain activity and maintenance of verbal and visual working memory: a systematic review

Oscillatory brain activity and maintenance of verbal and visual working memory: a systematic review

Spectrotemporal dynamics of the EEG during working memory encoding and maintenance predicts individual behavioral capacity

Memory load effect in auditory–verbal short-term memory task: EEG fractal and spectral analysis

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