EEG coherence or EEG correlation?

Guevara, Miguel Ángel; Corsi-Cabrera, María

doi:10.1016/s0167-8760(96)00038-4

Cited by 146 publications

(101 citation statements)

References 15 publications

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“…While the ThinkGear system is convenient and wireless, there is a minor trade-off in terms of data quality compared to conventional lab-based systems (Johnstone et al, 2012), and a major trade-off in the number of recording locations. Furthermore, a single channel of data does not permit computational methods such as coherence (Guevara and Corsi-Cabrera, 1996), source HEADSET EEG RELIABILITY 28 localization (Jatoi et al, 2014), or event-related potentials (Woodman, 2010). However, not all clinical populations will tolerate, and not all research approaches require such designs.…”

Section: Discussionmentioning

confidence: 99%

Test-retest reliability of a single-channel, wireless EEG system

Rogers

Johnstone

Aminov

et al. 2016

International Journal of Psychophysiology

100

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Recording systems to acquire electroencephalogram (EEG) data are traditionally lab-based. However, there are shortcomings to this method, and the ease of use and portability of emerging wireless EEG technologies offer a promising alternative. A previous validity study demonstrated data derived from a single-channel, wireless system (NeuroSky ThinkGear, San Jose, California) is comparable to EEG recorded from conventional lab-based equipment. The current study evaluated the reliability of this portable system using test-retest and reliable change analyses. Relative power (RP) of delta, theta, alpha, and beta frequency bands was derived from EEG data obtained from a single electrode over FP1 in 19 healthy youth (10-17 years old), 21 healthy adults (18-28 years old), and 19 healthy older adults (55-79 years old), during eyes-open, eyesclosed, auditory oddball, and visual n-back conditions. Intra-class correlations (ICCs) and Coefficients of Repeatability (CRs) were calculated from RP data re-collected one-day, one-week, and one-month later. Participants' levels of mood and attention were consistent across sessions. Eyes-closed resting EEG measurements using the portable device were reproducible (ICCs 0.76-0.85) at short and longer retest intervals in all three participant age groups. While still of at least fair reliability (ICCs 0.57-0.85), EEG obtained during eyes-open paradigms was less stable, and any change observed over time during these testing conditions can be interpreted utilizing the CR values provided. Combined with existing validity data, these findings encourage application of the portable EEG system for the study of brain function.

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Section: Discussionmentioning

confidence: 99%

Test-retest reliability of a single-channel, wireless EEG system

Rogers

Johnstone

Aminov

et al. 2016

International Journal of Psychophysiology

100

View full text Add to dashboard Cite

show abstract

“…All epochs contaminated by noise were removed to ensure that all signals analyzed were artifact-free. Later, these EEGs were analyzed by the EEG Magic software [30] that initially calculated the Fast Fourier Transform (FFT) to seven frequency bands: delta (1 -3 Hz), theta (4 -7 Hz), alpha1 (8 -10 Hz), alpha2 (11 -13 Hz), beta1 (14 -19 Hz), beta2 (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) and gamma (31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50). The correlation spectrum (r) was then calculated from the autospectra and the cross-spectrum of the signals to provide values between −1 and +1.…”

Section: Eeg Recording and Analysismentioning

confidence: 99%

“…The correlation is sensitive to both the phase and polarity of the signal, regardless of amplitude [31]. Finally, in order to approximate to a normal distribution, the correlation values were transformed into Z scores before beginning statistical analysis.…”

Section: Eeg Recording and Analysismentioning

confidence: 99%

EEG Correlations during a Working Memory Task with Emotional Stimuli in Girls with Post-Traumatic Stress Disorder Secondary to Sexual Abuse

Sanz-Martín¹,

Calderón-Zepeda²

2016

JBBS

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Survivors of Child Sexual Abuse (CSA) can develop Post-Traumatic Stress Disorder (PTSD), alterations in the prefrontal cortex, changes in electroencephalographic (EEG) activity, and lower performance on working memory tasks. The aim of this study was to characterize brain electrical correlations in girls with PTSD secondary to CSA during a working memory task based on recognizing emotional facial stimuli. Girls aged 8 -16 years old were evaluated: 12 with PTSD secondary to CSA, and 12 healthy girls with no history of abuse. EEG activity during a working memory task with emotional stimuli was recorded, and the inter-and intra-hemispheric correlations that assessed the functional connectivity among different cortical regions were analyzed. The PTSD group showed lower performance than controls on the working memory task while watching happy faces, while the EEG of this group showed greater intrahemispheric correlation among frontal areas and between frontal and posterior cortical regions. Also, the PTSD group had lower interhemispheric correlations between posterior temporal areas. The higher intrahemispheric correlation in the PTSD group could indicate that those girls used more brain areas when performing the task, likely because it required greater effort. The lower inter-posterior temporal correlation could be attributed to a reduction of the corpus callosum.

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“…It also discussed the effects of coherence training on follow-up quantitative electroencephalograms (QEEGs) and the changes produced by neurofeedback in the QEEG (Guevara & Corsi-Cabrera, 1996;Marosi et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

General Conference Presentations Abstracts

2005

Journal of Neurotherapy

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EEG coherence or EEG correlation?

Cited by 146 publications

References 15 publications

Test-retest reliability of a single-channel, wireless EEG system

Test-retest reliability of a single-channel, wireless EEG system

EEG Correlations during a Working Memory Task with Emotional Stimuli in Girls with Post-Traumatic Stress Disorder Secondary to Sexual Abuse

General Conference Presentations Abstracts

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