Modulation of Gamma and Alpha Activity during a Working Memory Task Engaging the Dorsal or Ventral Stream

Jokisch, Daniel; Jensen, Ole

doi:10.1523/jneurosci.5399-06.2007

Cited by 443 publications

(430 citation statements)

References 56 publications

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“…For the subjects of the WL+ group, the increase of alpha activity during WM retention (Table 1) is similar to what other authors have described Jokisch and Jensen, 2007;Tuladhar et al, 2007). Over time, we found that the maximum alpha power occurred in the middle of the retention interval and diminished towards the end of this period (Fig.…”

Section: Alpha Increase May Reflect Wm Maintenance or Inhibition Of Tsupporting

confidence: 88%

“…In particular, the role of alpha between WM activity Jokisch and Jensen, 2007;Tuladhar et al, 2007), cortical idling (Pfurtscheller et al, 1996), attention and top-down processes in general von Stein and Sarnthein, 2000) is being discussed (Klimesch et al, 2007;Palva and Palva, 2007). Usually, an increase of alpha power with respect to baseline is called event-related synchronization (alpha ERS) and a decrease event-related desynchronization (alpha ERD).…”

Section: Introductionmentioning

confidence: 99%

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EEG alpha distinguishes between cuneal and precuneal activation in working memory

Michels¹,

et al. 2008

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EEG alpha distinguishes between cuneal and precuneal activation in working memory AbstractIn the literature on EEG during working memory (WM), the role of alpha power (8-13 Hz) during WM retention has remained unclear. We recorded EEG while 18 subjects retained sets of consonants in memory for 3 s; setsize (ss4, ss6, ss8) determines memory workload. Theta power (4-8 Hz) increased with workload in all subjects in middle frontal electrodes. Using ICA, the increase in theta could be attributed to one component whose generators were localized by sLORETA in the medial frontal gyrus. Alpha power in parietal electrode Pz showed a mean increase during retention as compared to prestimulus fixation (event-related synchronization, ERS). On an individual basis, alpha power increased with workload in 9 subjects (WL+ group) and decreased in 9 subjects (WL-group). The alpha increased in upper alpha for the WL+ group (mean: 10.4 Hz) and decreased in lower alpha for the WLgroup (mean: 8.9 Hz). Time-frequency representations show high alpha power early during retention for the WL+ group and high alpha power late during retention for the WL-group. sLORETA revealed maximal contrast for the WL+ group in the cuneus and for the WL-group in the precuneus. In subjects with WL+, alpha increase in the cuneus may reflect WM maintenance or active inhibition of task-irrelevant areas. In subjects with WL-, alpha decrease in the precuneus may reflect release of inhibition associated with attentional demands. Thus, alpha EEG characterizes two aspects of processing in the same WM task. EEG alpha distinguishes between cuneal and precuneal activation in working memoryLars In the literature on EEG during working memory (WM), the role of alpha power (8-13 Hz) during WM retention has remained unclear. We recorded EEG while 18 subjects retained sets of consonants in memory for 3 s; setsize (ss4, ss6, ss8) determines memory workload.Theta power (4-8 Hz) increased with workload in all subjects in middle frontal electrodes. Using ICA, the increase in theta could be attributed to one component whose generators were localized by sLORETA in the medial frontal gyrus.Alpha power in parietal electrode Pz showed a mean increase during retention as compared to prestimulus fixation (event-related synchronization, ERS). On an individual basis, alpha power increased with workload in 9 subjects (WL+ group) and decreased in 9 subjects (WL− group). The alpha increased in upper alpha for the WL+ group (mean: 10.4 Hz) and decreased in lower alpha for the WL− group (mean: 8.9 Hz). Time-frequency representations show high alpha power early during retention for the WL+ group and high alpha power late during retention for the WL− group. sLORETA revealed maximal contrast for the WL+ group in the cuneus and for the WL− group in the precuneus.In subjects with WL+, alpha increase in the cuneus may reflect WM maintenance or active inhibition of task-irrelevant areas. In subjects with WL−, alpha decrease in the precuneus may reflect release of inhibition associated with attention...

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Section: Alpha Increase May Reflect Wm Maintenance or Inhibition Of Tsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

EEG alpha distinguishes between cuneal and precuneal activation in working memory

Michels¹,

et al. 2008

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“…More generally, gamma power increases are thought to reflect active, neuronal processing, mediating feature binding (e.g. Jokisch & Jensen, 2007). Moreover, it has been proposed that increases in gamma power should be observed when bottom-up information, such as stimulus-related information (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Jokisch & Jensen, 2007). In language comprehension studies, gamma power increases have been associated with semantic unification operations such as the integration of the meaning of an incoming word in a given speech context, access to the mental lexicon (Bastiaansen, Mazaheri & Jensen, 2012), the activation of local functional networks supporting semantic representations (Mellem, Friedman, & Medvedev, 2013) and the predictability of an upcoming word based on the preceding sentence context (Wang, Zhu, & Bastiaansen, 2012).…”

Section: Introductionmentioning

confidence: 99%

Alpha and gamma band oscillations index differential processing of acoustically reduced and full forms

Drijvers

Mulder²,

Ernestus

2016

Brain and Language

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Reduced forms like yeshay for yesterday often occur in conversations. Previous behavioral research reported a processing advantage for full over reduced forms. The present study investigated whether this processing advantage is reflected in a modulation of alpha (8)(9)(10)(11)(12) Hz) and gamma (30+ Hz) band activity. In three electrophysiological experiments, participants listened to full and reduced forms in isolation (Experiment 1), sentence-final position (Experiment 2), or mid-sentence position (Experiment 3). Alpha power was larger in response to reduced forms than to full forms, but only in Experiments 1 and 2. We interpret these increases in alpha power as reflections of higher auditory cognitive load. In all experiments, gamma power only increased in response to full forms, which we interpret as showing that lexical activation spreads more quickly through the semantic network for full than for reduced forms. These results confirm a processing advantage for full forms, especially in non-medial sentence position.3

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“…This is true particularly during rest where thoughts unfold on time scales of several seconds and, thus, require ongoing mnemonic activity, such as retrieval, retention, and manipulation of information (11), to ensure continuity and integrity of conscious experiences (3). Interestingly, working-memory studies have recently associated encoding and retention of information with a sustained increase in the oscillation amplitude for several seconds in multiple brain areas and frequency bands, suggesting that a slow modulation of oscillatory activity is an important systems-level mechanism of mnemonic operations (14)(15)(16). It remains unknown, however, whether amplitude modulation of local oscillatory activity is impaired in a memory disorder like AD and, therefore, could hold valuable diagnostic and prognostic information (4,7).…”

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confidence: 99%

Altered temporal correlations in parietal alpha and prefrontal theta oscillations in early-stage Alzheimer disease

Montez

Poil

Jones

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

276

230

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Encoding and retention of information in memory are associated with a sustained increase in the amplitude of neuronal oscillations for up to several seconds. We reasoned that coordination of oscillatory activity over time might be important for memory and, therefore, that the amplitude modulation of oscillations may be abnormal in Alzheimer disease (AD). To test this hypothesis, we measured magnetoencephalography (MEG) during eyes-closed rest in 19 patients diagnosed with early-stage AD and 16 agematched control subjects and characterized the autocorrelation structure of ongoing oscillations using detrended fluctuation analysis and an analysis of the life-and waiting-time statistics of oscillation bursts. We found that Alzheimer's patients had a strongly reduced incidence of alpha-band oscillation bursts with long life-or waiting-times (< 1 s) over temporo-parietal regions and markedly weaker autocorrelations on long time scales (1-25 seconds). Interestingly, the life-and waiting-times of theta oscillations over medial prefrontal regions were greatly increased. Whereas both temporo-parietal alpha and medial prefrontal theta oscillations are associated with retrieval and retention of information, metabolic and structural deficits in early-stage AD are observed primarily in temporo-parietal areas, suggesting that the enhanced oscillations in medial prefrontal cortex reflect a compensatory mechanism. Together, our results suggest that amplitude modulation of neuronal oscillations is important for cognition and that indices of amplitude dynamics of oscillations may prove useful as neuroimaging biomarkers of early-stage AD.Alzheimer's disease ͉ magnetoencephalography ͉ neuronal oscillations ͉ resting-state brain activity ͉ temporal correlations P sychological and neuroimaging data suggest that the brain performs many important functions during rest, such as retrieval and manipulation of information in short-term memory, and problem-solving and planning (1, 2). These resting-state functions may represent an essential aspect of human selfawareness and are susceptible to impairment in brain-related disorders including depression, schizophrenia, and dementia (3).Neuroimaging has identified anatomical patterns of activity that are remarkably consistent across resting-state experiments, most notably in the precuneus, lateral parietal and medial prefrontal cortices (4, 5). The existence of such a ''resting-state network'' has been suggested to reflect a ''default mode'' of brain operation in the absence of goal-directed behavior (6). Coordination of anatomically distributed activity during rest has been studied extensively by computing correlations between neuronal signals from different brain areas (Fig. 1). This approach has revealed aberrant resting-state networks in Alzheimer disease (AD) (7-9) and other disorders (4, 10, 11).For cognitive processing, coordination of local brain activity over time may be just as important as the coordination of simultaneous activity in anatomically distinct brain regions and may be refl...

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Modulation of Gamma and Alpha Activity during a Working Memory Task Engaging the Dorsal or Ventral Stream

Cited by 443 publications

References 56 publications

EEG alpha distinguishes between cuneal and precuneal activation in working memory

EEG alpha distinguishes between cuneal and precuneal activation in working memory

Alpha and gamma band oscillations index differential processing of acoustically reduced and full forms

Altered temporal correlations in parietal alpha and prefrontal theta oscillations in early-stage Alzheimer disease

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