Working memory and neural oscillations: alpha–gamma versus theta–gamma codes for distinct WM information?

Roux, Frédéric; Uhlhaas, Peter J.

doi:10.1016/j.tics.2013.10.010

Cited by 789 publications

(675 citation statements)

References 80 publications

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“…The assemblies implicated by the γ range may have been influenced by the extended neocortical myelinisation discussed above, with direct effects on the network of information stored across such regions. This is consistent with recent claims that α is responsible for the binding of visuo-spatial features (Roux and Uhlhaas, 2014) and is deployed in the service of determining successful lexical decisions (Strauss et al, 2015). I will further assume that the items concatenated are also initially "lexicalized" by α-embedded cell assemblies oscillating at the γ range within supragranular layers of the default-mode network (Raichle et al, 2001).…”

Section: Concatenationsupporting

confidence: 81%

“…The number of γ cycles able to be embedded within a θ cycle may also be the reason why working memory is limited to its classic constraint of 7 ± 2 (Kamiñski et al, 2011). Roux and Uhlhaas (2014) make the related claim that oscillatory activity assures the maintenance of working memory information. This explanation is of precisely the kind of granularity linguists should seek to capture syntactic operations like labeling, which involves storing conceptual roots in memory.…”

Section: Feeble Currents and Cognomic Substratesmentioning

confidence: 99%

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Components of the Language-Ready Brain

Boeckx¹,

Benítez‐Burraco²

2016

Frontiers Research Topics

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Section: Concatenationsupporting

confidence: 81%

Section: Feeble Currents and Cognomic Substratesmentioning

confidence: 99%

Components of the Language-Ready Brain

Boeckx¹,

Benítez‐Burraco²

2016

Frontiers Research Topics

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“…During the maintenance period, these two areas showed synchronized local field potentials in the u range. Oscillations in other frequencies may also be relevant, such as in the g band (Roux and Uhlhaas 2014).…”

Section: How Is Information In Working Memorymentioning

confidence: 99%

Working Memory: Maintenance, Updating, and the Realization of Intentions

Nyberg

Eriksson

2015

Cold Spring Harb Perspect Biol

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Correspondence: lars.nyberg@umu.se "Working memory" refers to a vast set of mnemonic processes and associated brain networks, relates to basic intellectual abilities, and underlies many real-world functions. Workingmemory maintenance involves frontoparietal regions and distributed representational areas, and can be based on persistent activity in reentrant loops, synchronous oscillations, or changes in synaptic strength. Manipulation of content of working memory depends on the dorsofrontal cortex, and updating is realized by a frontostriatal '"gating" function. Goals and intentions are represented as cognitive and motivational contexts in the rostrofrontal cortex. Different working-memory networks are linked via associative reinforcement-learning mechanisms into a self-organizing system. Normal capacity variation, as well as workingmemory deficits, can largely be accounted for by the effectiveness and integrity of the basal ganglia and dopaminergic neurotransmission.

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“…In a recent review, Roux and Uhlhaas have proposed that the cross-frequency coupling of theta-gamma or alpha-gamma codes for distinct WM information: sequentially verbal or visuo-spatial information, respectively [84] . Therefore, gamma activity likely represents objects in certain phases of theta and alpha activity, in which the PFC and sensory cortices communicate with each other to accomplish WM performance.…”

Section: Neural Oscillations Serve the Interaction Between Pfc And Sementioning

confidence: 99%

Prefrontal cortex and sensory cortices during working memory: quantity and quality

Bodner

Zhou

2015

Neurosci. Bull.

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The activity in sensory cortices and the prefrontal cortex (PFC) throughout the delay interval of working memory (WM) tasks refl ect two aspects of WM-quality and quantity, respectively. The delay activity in sensory cortices is fi ne-tuned to sensory information and forms the neural basis of the precision of WM storage, while the delay activity in the PFC appears to represent behavioral goals and filters out irrelevant distractions, forming the neural basis of the quantity of task-relevant information in WM. The PFC and sensory cortices interact through different frequency bands of neuronal oscillation (theta, alpha, and gamma) to fulfi ll goal-directed behaviors.Keywords: working memory; prefrontal cortex; capacity limit; memory precision; neuronal oscillations ·Review· IntroductionWorking memory (WM) refers to the cognitive processes of maintaining and storing information in the short term (usually seconds) for subsequent goal-directed action [1][2][3] . Persistent activity in both sensory cortices and association areas (especially the prefrontal cortex, PFC) throughout the delay interval of a WM task after sensory stimulus presentation (sample) are usually considered to be critical for WM maintenance, and to bridge the temporal gap between the sample and the subsequent contingent response (see reviews [4,5] ). However, with regard to WM the role of the delay activity in sensory cortices has been thought to differ from that of the PFC. The former has been thought to represent and store selective sensory information and the latter has been considered to exert attentional bias and cognitive control over the former (see reviews [6,7] ).Despite the vast storage in human long-term memory, WM has been demonstrated to have a capacity limited by the number of items [8,9] and this is strongly correlated with general cognitive ability [10,11] . Recent advances in studying visual WM have shown a precision limit of representations in WM besides the capacity limit [12][13][14][15][16] .Combined with the above findings, we propose that delay activity in the sensory cortices and PFC reflect the quality and quantity of representations in WM, respectively. Specifically, in this review, quantity refers to how many items/slots are stored in working memory, and quality refers to how precisely the features of each item/slot are represented in WM. Sensory Cortices and the Quality of Working MemoryNeurons in the PFC have been shown to respond to sensory stimuli in WM tasks [17,18] . Compared with those PFC neurons, neurons in sensory cortices appear to be more selectively tuned to stimulus features in WM tasks Neurosci Bull April 1, 2015, 31(2): 175-182 176 and consequently to maintain high-fi delity representations of stimulus information in the service of WM [19] .Some human imaging as well as neurophysiological studies in non-human primates have indicated an absence of persistent activity in early sensory regions [20][21][22][23][24] . However, other primate studies have revealed persistent modulation of neuronal activity i...

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Working memory and neural oscillations: alpha–gamma versus theta–gamma codes for distinct WM information?

Cited by 789 publications

References 80 publications

Components of the Language-Ready Brain

Components of the Language-Ready Brain

Working Memory: Maintenance, Updating, and the Realization of Intentions

Prefrontal cortex and sensory cortices during working memory: quantity and quality

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