EEG delta activity: an indicator of attention to internal processing during performance of mental tasks

Harmony, Thalı́a; Fernández, Thalı́a; Silva, Juan; Bernal, Jorge; Dı́az-Comas, Lourdes; Reyes, Alfonso; Marosi, Erzsébet; Rodrı́guez, Mario; Rodríguez, Miguel

doi:10.1016/s0167-8760(96)00053-0

Cited by 394 publications

(269 citation statements)

References 34 publications

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“…Delta results are in line with most calculation task studies, which have mainly used EEG and analyzed power distributions (Harmony et al 1996(Harmony et al , 2004Dimitriadis et al 2010;Giannitrapani 1971). Delta band activity is considered to increase during cognitive tasks requiring attention to internal processing and to decrease under conditions which demand attention to the external environment.…”

Section: Resting Vs Idics Tasksupporting

confidence: 73%

“…Delta band activity is considered to increase during cognitive tasks requiring attention to internal processing and to decrease under conditions which demand attention to the external environment. Additionally, the magnitude of the increment rises with the difficulty of the task (Harmony et al 1996;Dimitriadis et al 2010). Here we showed that in both groups, delta connectivity was greater during mental calculation than in resting state, a finding in line with the previous literature.…”

Section: Resting Vs Idics Taskmentioning

confidence: 99%

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Synchronization during an internally directed cognitive state in healthy aging and mild cognitive impairment: a MEG study

López

Garcés

Cuesta

et al. 2014

AGE

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Mild cognitive impairment (MCI) is a stage between healthy aging and dementia. It is known that in this condition the connectivity patterns are altered in the resting state and during cognitive tasks, where an extra effort seems to be necessary to overcome cognitive decline. We aimed to determine the functional connectivity AGE (2014) pattern required to deal with an internally directed cognitive state (IDICS) in healthy aging and MCI. This task differs from the most commonly employed ones in neurophysiology, since inhibition from external stimuli is needed, allowing the study of this control mechanism. To this end, magnetoencephalographic (MEG) signals were acquired from 32 healthy individuals and 38 MCI patients, both in resting state and while performing a subtraction task of two levels of difficulty. Functional connectivity was assessed with phase locking value (PLV) in five frequency bands. Compared to controls, MCIs showed higher PLV values in delta, theta, and gamma bands and an opposite pattern in alpha, beta, and gamma bands in resting state. These changes were associated with poorer neuropsychological performance. During the task, this group exhibited a hypersynchronization in delta, theta, beta, and gamma bands, which was also related to a lower cognitive performance, suggesting an abnormal functioning in this group. Contrary to controls, MCIs presented a lack of synchronization in the alpha band which may denote an inhibition deficit. Additionally, the magnitude of connectivity changes rose with the task difficulty in controls but not in MCIs, in line with the compensation-related utilization of neural circuits hypothesis (CRUNCH) model.

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Section: Resting Vs Idics Tasksupporting

confidence: 73%

Section: Resting Vs Idics Taskmentioning

confidence: 99%

Synchronization during an internally directed cognitive state in healthy aging and mild cognitive impairment: a MEG study

López

Garcés

Cuesta

et al. 2014

AGE

View full text Add to dashboard Cite

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“…The correlations had a medium effect size and showed that a decrease in delta power was related to higher accuracy and shorter latencies. It has been suggested that delta activity is associated with task difficulty (Harmony et al, 1996) and decision making (Basar et al, 2001). This notion might be in agreement with the relation that we found between delta IBP and the behavioral measures, with later word repetitions requiring less decision making effort.…”

Section: Induced Band Powermentioning

confidence: 99%

“…Because additional repetitions of the words (up to nine times) will result in better memory retrieval, we hypothesized that multiple repetitions affect the later ERP recollection component rather than the earlier ERP familiarity component. Furthermore, because there is evidence that the delta, theta, and alpha frequency bands are sensitive to task difficulty and decision making (e.g., Basar et al, 2001;Gevins et al, 1997;Harmony et al, 1996), it was anticipated that the delta and theta bands will show a decrease and the alpha bands will show an increase in activity across the nine word repetitions.…”

Section: Introductionmentioning

confidence: 99%

Changes in brain electrical activity during extended continuous word recognition

et al. 2005

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Twenty healthy subjects (10 men, 10 women) participated in an EEG study with an extended continuous recognition memory task, in which each of 30 words was randomly shown 10 times and subjects were required to make old vs. new decisions. Both event-related brain potentials (ERPs) and induced band power (IBP) were investigated. We hypothesized that repeated presentations affect recollection rather than familiarity.For the 300-to 500-ms time window, an dold/newT ERP effect was found for the first vs. second word presentations. The correct recognition of an doldT word was associated with a more positive waveform than the correct identification of a new word. The old/new effect was most pronounced at and around the midline parietal electrode position. For the 500-to 800-ms time window, a linear repetition effect was found for multiple word repetitions. Correct recognition after an increasing number of repetitions was associated with increasing positivity. The multiple repetitions effect was most pronounced at the midline central (Cz) and fronto-central (FCz) electrode positions and reflects a graded recollection process: the stronger the memory trace grows, the more positive the ERP in the 500-to 800-ms time window. The ERP results support a dual-processing model, with familiarity being discernable from a more graded recollection state that depends on memory strengths.For IBP, we found dold/newT effects for the lower-2 alpha, theta, and delta bands, with higher bandpower during doldT words. The lower-2 alpha dold/newT effect most probably reflects attentional processes, whereas the theta and delta effects reflect encoding and retrieval processes. Upon repeated word presentations, the magnitude of induced delta power in the 375-to 750-ms time window diminished linearly. Correlation analysis suggests that decreased delta power is moderately associated with faster decision speed and higher accuracy. D

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“…12 Hz activity as well as activity in the delta band (Harmony et al 1996). To date, EEG activity and the H reflex have not been measured concurrently during MM or MI tasks.…”

mentioning

confidence: 99%

The effect of voluntary modulation of the sensory-motor rhythm during different mental tasks on H reflex

Jarjees

Vučković

2016

International Journal of Psychophysiology

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EEG delta activity: an indicator of attention to internal processing during performance of mental tasks

Cited by 394 publications

References 34 publications

Synchronization during an internally directed cognitive state in healthy aging and mild cognitive impairment: a MEG study

Synchronization during an internally directed cognitive state in healthy aging and mild cognitive impairment: a MEG study

Changes in brain electrical activity during extended continuous word recognition

The effect of voluntary modulation of the sensory-motor rhythm during different mental tasks on H reflex

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