Event related desynchronization: use as a neurophysiologic marker is restricted

Başar, Erol; Gölbaşı, Bilge Turp

doi:10.1007/s11571-014-9301-5

Cited by 10 publications

(8 citation statements)

References 42 publications

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“…Window V is very broad since it extended over the full gamma band and across the duration of the poststimulus interval, as indicated in Table 1. The latencies of these induced non- phase-locked CS activities were relatively short, consistent with other studies of visual stimuli (Basar and Golbasi, 2014). …”

Section: Resultssupporting

confidence: 90%

Oscillatory EEG activity induced by conditioning stimuli during fear conditioning reflects Salience and Valence of these stimuli more than Expectancy

et al. 2017

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Imaging studies have described hemodynamic activity during fear conditioning protocols with stimulus trains in which a visual conditioned stimulus (CS+) is paired with an aversive unconditioned stimulus (US, painful laser pulse) while another visual stimulus is unpaired (CS−). We now test the hypothesis that CS Event-Related Spectral Perturbations (ERSPs) are related to ratings of CS Expectancy (likelihood of pairing with the US), Valence (unpleasantness) and Salience (ability to capture attention). ERSP windows in EEG were defined by both time after the CS and frequency, and showed increased oscillatory power (Event Related Synchronization, ERS) in the delta/theta Windows (0–8 Hz) and the gamma Window (30–55 Hz). Decreased oscillatory power (Event Related Desynchronization – ERD) was found in alpha (8–14 Hz) and beta Windows (14–30 Hz). The delta/theta ERS showed a differential effect of CS+ versus CS− at Prefrontal, Frontal and Midline Channels, while alpha and beta ERD were greater at Parietal and Occipital Channels early in the stimulus train. The gamma ERS Window increased from Habituation to Acquisition over a broad area from Frontal and occipital electrodes. The CS Valence and Salience were greater for CS+ than CS−, and were correlated with each other and with the ERD at overlapping Channels, particularly in the alpha Window. Expectancy and CS Skin Conductance Response were greater for CS+ than CS− and were correlated with ERSP at fewer Channels than Valence or Salience. These results suggest that alpha ERSP activity during fear conditioning reflects Valence and Salience of the CSs more than conditioning per se. The CS Valence and Salience were correlated with each other and with ERSP in the alpha Window more commonly than in other windows. Delta/theta ERSP differentiates between CS+ and CS− over a Midline Channel at which ERSP is correlated with Expectancy ratings. Although, both Expectancy and CS Skin Conductance Response (SCR) were correlated with ERSP this correlation occurred at fewer and different Channels than those for Valence or Salience. These results suggest that ERSP activity is related to Valence and Salience of the CSs more than to conditioning per se.

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Section: Resultssupporting

confidence: 90%

Oscillatory EEG activity induced by conditioning stimuli during fear conditioning reflects Salience and Valence of these stimuli more than Expectancy

et al. 2017

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“…Considering previous studies have referred the relevant influence of the alpha prestimulus in the subsequent behaviour of the alpha ERD [ 24 ], a specific analysis was performed in the previous 400 ms to the onset of the visual stimuli. The ANOVA factors for the alpha prestimulus were identical to those used for the alpha ERD, although in this case for the entire period (-400 to 0 ms, with zero indicating the onset of the target stimulus).…”

Section: Resultsmentioning

confidence: 99%

“…A relevant issue regarding the potential differences obtained in alpha ERD is related to the prestimulus alpha content [ 24 ]. In our results, no changes were identified in the alpha band previous to the onset of the stimuli.…”

Section: Discussionmentioning

confidence: 99%

Retest reliability of individual alpha ERD topography assessed by human electroencephalography

et al. 2017

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BackgroundDespite the immense literature related to diverse human electroencephalographic (EEG) parameters, very few studies have focused on the reliability of these measures. Some of the most studied components (i.e., P3 or MMN) have received more attention regarding the stability of their main parameters, such as latency, amplitude or topography. However, spectral modulations have not been as extensively evaluated considering that different analysis methods are available.The main aim of the present study is to assess the reliability of the latency, amplitude and topography of event-related desynchronization (ERD) for the alpha band (10–14 Hz) observed in a cognitive task (visual oddball). Topography reliability was analysed at different levels (for the group, within-subjects individually and between-subjects individually).ResultsThe latency for alpha ERD showed stable behaviour between two sessions, and the amplitude exhibited an increment (more negative) in the second session.Alpha ERD topography exhibited a high correlation score between sessions at the group level (r = 0.903, p<0.001). The mean value for within-subject correlations was 0.750 (with a range from 0.391 to 0.954). Regarding between-subject topography comparisons, some subjects showed a highly specific topography, whereas other subjects showed topographies that were more similar to those of other subjects.ConclusionERD was mainly stable between the two sessions with the exception of amplitude, which exhibited an increment in the second session. Topography exhibits excellent reliability at the group level; however, it exhibits highly heterogeneous behaviour at the individual level. Considering that the P3 was previously evaluated for this group of subjects, a direct comparison of the correlation scores was possible, and it showed that the ERD component is less reliable in individual topography than in the ERP component (P3).

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“…EEG activities induced by CSs have high temporal resolution that can be used to measure the timing of emotional responses [ 59 ] and cortical processes [ 106 , 157 , 158 , 159 ] The ERSP may consist of a decrease in the ratio of EEG spectral power over baseline of the EEG (ERD) or an increase in this ratio (ERS). Our studies show that the ERSP following conditioning stimuli can be related to the behavioral response to those stimuli ( Figure 2 B,C).…”

Section: Methods: Behavioral Protocol and Metricsmentioning

confidence: 99%

Behavioral, Physiological and EEG Activities Associated with Conditioned Fear as Sensors for Fear and Anxiety

Chien

Colloca

Korzeniewska

et al. 2020

Sensors

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Anxiety disorders impose substantial costs upon public health and productivity in the USA and worldwide. At present, these conditions are quantified by self-report questionnaires that only apply to behaviors that are accessible to consciousness, or by the timing of responses to fear- and anxiety-related words that are indirect since they do not produce fear, e.g., Dot Probe Test and emotional Stroop. We now review the conditioned responses (CRs) to fear produced by a neutral stimulus (conditioned stimulus CS+) when it cues a painful laser unconditioned stimulus (US). These CRs include autonomic (Skin Conductance Response) and ratings of the CS+ unpleasantness, ability to command attention, and the recognition of the association of CS+ with US (expectancy). These CRs are directly related to fear, and some measure behaviors that are minimally accessible to consciousness e.g., economic scales. Fear-related CRs include non-phase-locked phase changes in oscillatory EEG power defined by frequency and time post-stimulus over baseline, and changes in phase-locked visual and laser evoked responses both of which include late potentials reflecting attention or expectancy, like the P300, or contingent negative variation. Increases (ERS) and decreases (ERD) in oscillatory power post-stimulus may be generalizable given their consistency across healthy subjects. ERS and ERD are related to the ratings above as well as to anxious personalities and clinical anxiety and can resolve activity over short time intervals like those for some moods and emotions. These results could be incorporated into an objective instrumented test that measures EEG and CRs of autonomic activity and psychological ratings related to conditioned fear, some of which are subliminal. As in the case of instrumented tests of vigilance, these results could be useful for the direct, objective measurement of multiple aspects of the risk, diagnosis, and monitoring of therapies for anxiety disorders and anxious personalities.

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Event related desynchronization: use as a neurophysiologic marker is restricted

Cited by 10 publications

References 42 publications

Oscillatory EEG activity induced by conditioning stimuli during fear conditioning reflects Salience and Valence of these stimuli more than Expectancy

Oscillatory EEG activity induced by conditioning stimuli during fear conditioning reflects Salience and Valence of these stimuli more than Expectancy

Retest reliability of individual alpha ERD topography assessed by human electroencephalography

Behavioral, Physiological and EEG Activities Associated with Conditioned Fear as Sensors for Fear and Anxiety

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