Event-related EEG oscillations to semantically unrelated words in normal and learning disabled children

Fernández, Thalı́a; Harmony, Thalı́a; Mendoza, Omar; López-Alanís, Paula; Marroquín, José L.; Otero, Gloria; Ricardo-Garcell, Josefina

doi:10.1016/j.bandc.2012.04.008

Cited by 20 publications

(14 citation statements)

References 45 publications

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“…The strongest between-group difference was found for the theta band. Thus, this finding corresponds to several previously published studies showing an increase in theta band power in children with LD [6][7][8][9][10][11][12][13][14]. However, unlike in several previous studies, we did not observe a decrease in alpha band power.…”

Section: Discussionsupporting

confidence: 87%

“…EEG studies that examined children with LD have shown that they have greater theta and less alpha (and beta) power than what is normal for their age during a relaxed state. These findings are often considered evidence for the so-called 'maturational delay hypothesis' [6][7][8][9][10][11][12][13][14]. This knowledge has been used to guide a specific neurofeedback therapy that supports the improvement of LD disabilities [15].…”

Section: Introductionmentioning

confidence: 99%

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Resting-state electroencephalogram in learning-disabled children

Jäncke

Saka

Badawood³

et al. 2019

NeuroReport

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The neurophysiological underpinnings of learning disabilities remain unknown. In this clinical study, we recorded electroencephalograms for a large sample of children with learning disabilities (LD) and healthy control children (n=216) during resting states in which the eyes were either open or closed. We calculated the power and lagged phase coherence in six main frequency bands (delta, theta, lower and upper alpha, and lower and upper beta) to re-evaluate the question of whether children with LD show frontal theta power increases and posterior alpha band decreases on the basis of patterns of electroencephalogram oscillation, which could then be considered as evidence for the so-called 'maturational delay hypothesis.' We identified a general (not restricted to frontal electrodes) power increase in the theta band and no accompanying concomitant alpha band decrease at the posterior electrode position. In addition, we observed increased beta band power at frontal electrodes for LD children. With respect to lagged phase coherence, which is a coherence measure not influenced by volume conduction, we identified decreased coherence for children with LD in the upper alpha band during the eyes closed condition. We interpret this LD-specific resting-state activation pattern as indicating a suboptimally functioning neural resting-state network that provides a detrimental 'starting point' for task-specific brain activations. Nsreen (2019). Resting-state electroencephalogram in learning-disabled children: power and connectivity analyses. NeuroReport, 30(2):95-101.The neurophysiological underpinnings of learning disabilities remain unknown. In this clinical study, we recorded electroencephalograms for a large sample of children with learning disabilities (LD) and healthy control children (n = 216) during resting states in which the eyes were either open or closed. We calculated the power and lagged phase coherence in six main frequency bands (delta, theta, lower and upper alpha, and lower and upper beta) to re-evaluate the question of whether children with LD show frontal theta power increases and posterior alpha band decreases on the basis of patterns of electroencephalogram oscillation, which could then be considered as evidence for the so-called 'maturational delay hypothesis. ' We identified a general (not restricted to frontal electrodes) power increase in the theta band and no accompanying concomitant alpha band decrease at the posterior electrode position. In addition, we observed increased beta band power at frontal electrodes for LD children. With respect to lagged phase coherence, which is a coherence measure not influenced by volume conduction, we identified decreased coherence for children with LD in the upper alpha band during the eyes closed condition. We interpret this LD-specific resting-state activation pattern as indicating a suboptimally functioning neural resting-state network that provides a detrimental 'starting point' for taskspecific brain activations. NeuroReport 00:000-000

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Resting-state electroencephalogram in learning-disabled children

Jäncke

Saka

Badawood³

et al. 2019

NeuroReport

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“…Pairs of words that were semantically related or unrelated were presented to both LD children and control children with good scholastic achievement. During this presentation, the event-related EEG responses were recorded (Fernández et al, 2012). This task was selected because it requires several language processes and other associated processes, such as attention and working memory.…”

Section: Experimental Datamentioning

confidence: 99%

The functional significance of delta oscillations in cognitive processing

Harmony

2013

Front. Integr. Neurosci.

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541

346

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Ample evidence suggests that electroencephalographic (EEG) oscillatory activity is linked to a broad variety of perceptual, sensorimotor, and cognitive operations. However, few studies have investigated the delta band (0.5–3.5 Hz) during different cognitive processes. The aim of this review is to present data and propose the hypothesis that sustained delta oscillations inhibit interferences that may affect the performance of mental tasks, possibly by modulating the activity of those networks that should be inactive to accomplish the task. It is clear that two functionally distinct and potentially competing brain networks can be broadly distinguished by their contrasting roles in attention to the external world vs. the internally directed mentation or concentration. During concentration, EEG delta (1–3.5 Hz) activity increases mainly in frontal leads in different tasks: mental calculation, semantic tasks, and the Sternberg paradigm. This last task is considered a working memory task, but in neural, as well as phenomenological, terms, working memory can be best understood as attention focused on an internal representation. In the Sternberg task, increases in power in the frequencies from 1 to 3.90 Hz in frontal regions are reported. In a Go/No-Go task, power increases at 1 Hz in both conditions were observed during 100–300 ms in central, parietal and temporal regions. However, in the No-Go condition, power increases were also observed in frontal regions, suggesting its participation in the inhibition of the motor response. Increases in delta power were also reported during semantic tasks in children. In conclusion, the results suggest that power increases of delta frequencies during mental tasks are associated with functional cortical deafferentation, or inhibition of the sensory afferences that interfere with internal concentration. These inhibitory oscillations would modulate the activity of those networks that should be inactive to accomplish the task.

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“…Receptive vocabulary was evaluated using the Peabody Picture Vocabulary Test-4 (PPVT; Dunn & Dunn, 2007). Expressive vocabulary and non-verbal reasoning abilities were measured using the vocabulary and matrix reasoning subtests of the Weschler Abbreviated Scale of Intelligence (WASI-II; Wechsler, 2002); WASI scores were not collected for three participants.…”

Section: Psychometric Testsmentioning

confidence: 99%

EEG phase synchronization during semantic unification relates to individual differences in children’s vocabulary skill

Panda

Emami

Valiante

et al. 2020

Developmental Science

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As we listen to speech, our ability to understand what was said requires us to retrieve and bind together individual word meanings into a coherent discourse representation. This so-called semantic unification is a fundamental cognitive skill, and its development relies on the integration of neural activity throughout widely distributed functional brain networks. In this proof-of-concept study, we examine, for the first time, how these functional brain networks develop in children. Twenty-six children (ages 4-17) listened to well-formed sentences and sentences containing a semantic violation, while EEG was recorded. Children with stronger vocabulary showed N400 effects that were more concentrated to centroparietal electrodes and greater EEG phase synchrony (phase lag index; PLI) between right centroparietal and bilateral frontocentral electrodes in the delta frequency band (1-3 Hz) 1.27-1.53 s after listening to well-formed sentences compared to sentences containing a semantic violation. These effects related specifically to individual differences in receptive vocabulary, perhaps pointing to greater recruitment of functional brain networks important for top-down semantic unification with development. Less skilled children showed greater delta phase synchrony for violation sentences 3.41-3.64 s after critical word onset. This later effect was partly driven by individual differences in nonverbal reasoning, perhaps pointing to non-verbal compensatory processing to extract meaning from speech in children with less developed vocabulary. We suggest that functional brain network communication, as measured by momentary changes in the phase synchrony of EEG oscillations, develops throughout the school years to support language comprehension in different ways depending on children's verbal and nonverbal skill levels.

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Event-related EEG oscillations to semantically unrelated words in normal and learning disabled children

Cited by 20 publications

References 45 publications

Resting-state electroencephalogram in learning-disabled children

Resting-state electroencephalogram in learning-disabled children

The functional significance of delta oscillations in cognitive processing

EEG phase synchronization during semantic unification relates to individual differences in children’s vocabulary skill

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