Comparative frequency analysis of single EEG - Evoked potential records

Başar, Erol; Gönder, A.; Ungan, Pekcan

doi:10.1016/0141-5425(80)90086-2

Cited by 24 publications

(11 citation statements)

References 5 publications

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“…Some studies have concluded that the averaged ERP emerges as the result of stimulus induced phase-resetting of ongoing oscillatory rhythms (Basar, 1980, Brandt et al, 1991, Makeig et al, 2002, Jansen et al, 2003, Klimesch et al, 2004, Gruber et al, 2005, Hanslmayr et al, 2007, Klimesch et al, 2007a,c), while others have supported the view that new stimulus-evoked neural activity is added to the spontaneously ongoing oscillations (Fell et al, 2004, Shah et al, 2004, Makinen et al, 2005, Mazaheri and Jensen, 2006, Becker et al, 2008). As both phase synchronization of ongoing oscillations and the addition of time-locked neural activity would increase post-stimulus phase consistency, it is not always easy to discriminate which of these is the primary mechanism of ERP generation (Yeung et al, 2004, Sauseng et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Spatial attention boosts short-latency neural responses in human visual cortex

et al. 2012

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In a previous study of visual-spatial attention, Martinez et al. (2007) replicated the well-known finding that stimuli at attended locations elicit enlarged early components in the averaged event-related potential (ERP), which were localized to extrastriate visual cortex. The mechanisms that underlie these attention-related ERP modulations in the latency range of 80-200 ms, however, remain unclear. The main question is whether attention produces increased ERP amplitudes in time-domain averages by augmenting stimulus-triggered neural activity, or alternatively, by increasing the phase-locking of ongoing EEG oscillations to the attended stimuli. We compared these alternative mechanisms using Morlet wavelet decompositions of event-related EEG changes. By analyzing single-trial spectral amplitudes in the theta (4-8 Hz) and alpha (8-12 Hz) bands, which were the dominant frequencies of the early ERP components, it was found that stimuli at attended locations elicited enhanced neural responses in the theta band in the P1 (88-120 ms) and N1 (148-184 ms) latency ranges that were additive with the ongoing EEG. In the alpha band there was evidence for both increased additive neural activity and increased phase-synchronization of the EEG following attended stimuli, but systematic correlations between pre- and post- stimulus alpha activity were more consistent with an additive mechanism. These findings provide the strongest evidence to date in humans that short-latency neural activity elicited by stimuli within the spotlight of spatial attention is boosted or amplified at early stages of processing in extrastriate visual cortex.

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Section: Discussionmentioning

confidence: 99%

Spatial attention boosts short-latency neural responses in human visual cortex

et al. 2012

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“…This unequivocal situation has been described for the N1 component of the auditory [10,5] and visual evoked potentials [34,9]. The second, more complex situation is described as phase resetting with enhancement during which the sensory stimulation induces an increase in EEG amplitude in addition to phase resetting [6]. In this case, it is not possible to distinguish the activity generated by phasic neural events (independent of spontaneous EEG) from those linked to EEG phase resetting [40].…”

Section: Introductionmentioning

confidence: 98%

“…An alternative view (oscillation model) suggested by pioneer experiments [4,5] pointed out the fact that evoked potentials might result from phase-locking or phase-reset of the basic EEG rhythms within specific frequency bands, as a response to external stimulation [6]. Evidence of stimulus-induced phase-locking has been reported by several groups, using a variety of signal analysis methods [7-12].…”

Section: Introductionmentioning

confidence: 99%

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Pure phase-locking of beta/gamma oscillation contributes to the N30 frontal component of somatosensory evoked potentials

et al. 2007

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Abstract

Background

Evoked potentials have been proposed to result from phase-locking of electroencephalographic (EEG) activities within specific frequency bands. However, the respective contribution of phasic activity and phase resetting of ongoing EEG oscillation remains largely debated. We here applied the EEGlab procedure in order to quantify the contribution of electroencephalographic oscillation in the generation of the frontal N30 component of the somatosensory evoked potentials (SEP) triggered by median nerve electrical stimulation at the wrist. Power spectrum and intertrial coherence analysis were performed on EEG recordings in relation to median nerve stimulation.

Results

The frontal N30 component was accompanied by a significant phase-locking of beta/gamma oscillation (25–35 Hz) and to a lesser extent of 80 Hz oscillation.

After the selection in each subject of the trials for which the power spectrum amplitude remained unchanged, we found pure phase-locking of beta/gamma oscillation (25–35 Hz) peaking about 30 ms after the stimulation. Transition across trials from uniform to normal phase distribution revealed temporal phase reorganization of ongoing 30 Hz EEG oscillations in relation to stimulation. In a proportion of trials, this phase-locking was accompanied by a spectral power increase peaking in the 30 Hz frequency band. This corresponds to the complex situation of 'phase-locking with enhancement' in which the distinction between the contribution of phasic neural event versus EEG phase resetting is hazardous.

Conclusion

The identification of a pure phase-locking in a large proportion of the SEP trials reinforces the contribution of the oscillatory model for the physiological correlates of the frontal N30. This may imply that ongoing EEG rhythms, such as beta/gamma oscillation, are involved in somatosensory information processing.

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“…This neurological response to a salient event can also modify oscillatory activity by “phase re-ordering” or realignment of background EEG frequency bands [5, 6]. This time-locked synchronization of oscillatory activity is termed an event-related oscillation (ERO) [7].…”

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confidence: 99%

Acute low-level alcohol consumption reduces phase locking of event-related oscillations in rodents

Amodeo

Wills

Ehlers

2017

Behavioural Brain Research

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Event-related oscillations (EROs) are rhythmic changes that are evoked by a sensory and/or cognitive stimulus that can influence the dynamics of the EEG. EROs are defined by the decomposition of the EEG signal into magnitude (energy) and phase information and can be elicited in both humans and animals. EROs have been linked to several relevant genes associated with ethanol dependence phenotypes in humans and are altered in selectively bred alcohol-preferring rats. However, pharmacological studies are only beginning to emerge investigating the impact low intoxicating doses of ethanol can have on event-related neural oscillations. The main goal of the present study was to investigate the effects of low levels of voluntary consumption of ethanol, in rats, on phase locking of EROs in order to give further insight into the acute intoxicating effects of ethanol on the brain. To this end, we allow rats to self-administer unsweetened 20% ethanol over 15 intermittent sessions. This method results in a stable low-dose consumption of ethanol. Using an auditory event-related potential “oddball” paradigm, we investigated the effects of alcohol on the phase variability of EROs from electrodes implanted into the frontal cortex, dorsal hippocampus, and amygdala. We found that intermittent ethanol self-administration was sufficient to produce a significant reduction in overall intraregional synchrony across all targeted regions. These data suggest that phase locking of EROs within brain regions known to be impacted by alcohol may represent a sensitive biomarker of low levels of alcohol intoxication.

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Comparative frequency analysis of single EEG - Evoked potential records

Cited by 24 publications

References 5 publications

Spatial attention boosts short-latency neural responses in human visual cortex

Spatial attention boosts short-latency neural responses in human visual cortex

Pure phase-locking of beta/gamma oscillation contributes to the N30 frontal component of somatosensory evoked potentials

Acute low-level alcohol consumption reduces phase locking of event-related oscillations in rodents

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