Scalp-Recorded Induced Gamma-Band Responses to Auditory Stimulation and Its Correlations with Saccadic Muscle-Activity

Yuval-Greenberg, Shlomit; Deouell, Leon Y.

doi:10.1007/s10548-010-0157-7

Cited by 39 publications

(35 citation statements)

References 33 publications

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“…For example, they analyzed their data on a trial-by-trial basis, and found that microsaccades nearly always produced a transient burst of gamma band activity ~4 ms later. It was also found that the iGBR all but disappeared on trials where microsaccades were absent (see Yuval-Greenberg & Deouell, 2011 for comparable results with auditory stimuli).…”

Section: Introductionmentioning

confidence: 65%

Coherent illusory contours reduce microsaccade frequency

et al. 2011

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Synchronized high-frequency gamma band oscillations (30-100 Hz) are thought to mediate the binding of single visual features into whole-object representations. For example, induced gamma band oscillations (iGBR) have been recorded ~280 ms after the onset of a coherent Kanizsa Triangle, but not after an incoherent equivalent shape. However, several recent studies have provided evidence that the EEG-recorded iGBR is a by-product of small saccadic eye movements (microsaccades). Considering these two previous findings, we hypothesised that there would be a more microsaccades following the onset of a coherent Kanizsa triangle. However, we found that microsaccade rebound rate significantly higher after an incoherent triangle was presented. This suggests that microsaccades are not a reliable indicator of perceptual binding. Moreover, the result also implies that iGBR cannot be universally produced by ocular artefacts.

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Section: Introductionmentioning

confidence: 65%

Coherent illusory contours reduce microsaccade frequency

et al. 2011

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“…This artifact has previously been acknowledged as a transient problem in response to stimulus onset (Yuval-Greenberg et al, 2008; Keren et al, 2010; Hassler et al, 2011; Schwartzman and Kranczioch, 2011; Yuval-Greenberg and Deouell, 2011). Our results show that, for non-stationary stimulation and cognitive demands, the saccadic spike artifact is not limited to a transient signal distortion, but can induce a persistent modulation of gamma-band activity.…”

Section: Discussionmentioning

confidence: 96%

“…Ocular muscle contractions at microsaccade onset induce “spike potentials” in the EEG with maximum power in the gamma band at parietal electrodes (Thickbroom and Mastaglia, 1985; Riemslag et al, 1988; Yuval-Greenberg et al, 2008; Keren et al, 2010; Carl et al, 2012). Furthermore, microsaccade rate shows a characteristic suppression-enhancement sequence following visual stimulus transients and is also modulated by cognitive factors (Engbert and Kliegl, 2003; Rolfs et al, 2008; Yuval-Greenberg and Deouell, 2011). Together, spike potentials mimic transient gamma-band activity of neuronal origin, and are thus highly problematic for studying visually gamma-band activity with EEG.…”

Section: Introductionmentioning

confidence: 99%

Dissociating neuronal gamma-band activity from cranial and ocular muscle activity in EEG

Hipp¹,

Siegel²

2013

Front. Hum. Neurosci.

198

188

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EEG is the most common technique for studying neuronal dynamics of the human brain. However, electromyogenic artifacts from cranial muscles and ocular muscles executing involuntary microsaccades compromise estimates of neuronal activity in the gamma band (>30 Hz). Yet, the relative contributions and practical consequences of these artifacts remain unclear. Here, we systematically dissected the effects of these different artifacts on studying visual gamma-band activity with EEG on the sensor and source level, and show strategies to cope with these confounds. We found that cranial muscle activity prevented a direct investigation of neuronal gamma-band activity at the sensor level. Furthermore, we found prolonged microsaccade-related artifacts beyond the well-known transient EEG confounds. We then show that if electromyogenic artifacts are carefully accounted for, the EEG nonetheless allows for studying visual gamma-band activity even at the sensor level. Furthermore, we found that source analysis based on spatial filtering does not only map the EEG signals to the cortical space of interest, but also efficiently accounts for cranial and ocular muscle artifacts. Together, our results clarify the relative contributions and characteristics of myogenic artifacts confounding visual gamma-band activity in EEG, and provide practical guidelines for future experiments.

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“…It has been suggested that both in the visual (Yuval-Greenberg et al, 2008) and auditory domains the induced GBR is susceptible to contamination by spike potentials generated by micro-saccadic eye movements (Yuval-Greenberg and Deouell, 2011). A correlation between gamma band activity and saccadic rate was observed, both showing a stereotypical decrease of activity after sound onset followed by a sustained increase 200–300 ms after sound onset.…”

Section: Discussionmentioning

confidence: 99%

Mapping Symbols to Sounds: Electrophysiological Correlates of the Impaired Reading Process in Dyslexia

Widmann¹,

Schröger²,

Tervaniemi³

et al. 2012

Front. Psychology

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Dyslexic and control first-grade school children were compared in a Symbol-to-Sound matching test based on a non-linguistic audiovisual training which is known to have a remediating effect on dyslexia. Visual symbol patterns had to be matched with predicted sound patterns. Sounds incongruent with the corresponding visual symbol (thus not matching the prediction) elicited the N2b and P3a event-related potential (ERP) components relative to congruent sounds in control children. Their ERPs resembled the ERP effects previously reported for healthy adults with this paradigm. In dyslexic children, N2b onset latency was delayed and its amplitude significantly reduced over left hemisphere whereas P3a was absent. Moreover, N2b amplitudes significantly correlated with the reading skills. ERPs to sound changes in a control condition were unaffected. In addition, correctly predicted sounds, that is, sounds that are congruent with the visual symbol, elicited an early induced auditory gamma band response (GBR) reflecting synchronization of brain activity in normal-reading children as previously observed in healthy adults. However, dyslexic children showed no GBR. This indicates that visual symbolic and auditory sensory information are not integrated into a unitary audiovisual object representation in them. Finally, incongruent sounds were followed by a later desynchronization of brain activity in the gamma band in both groups. This desynchronization was significantly larger in dyslexic children. Although both groups accomplished the task successfully remarkable group differences in brain responses suggest that normal-reading children and dyslexic children recruit (partly) different brain mechanisms when solving the task. We propose that abnormal ERPs and GBRs in dyslexic readers indicate a deficit resulting in a widespread impairment in processing and integrating auditory and visual information and contributing to the reading impairment in dyslexia.

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Scalp-Recorded Induced Gamma-Band Responses to Auditory Stimulation and Its Correlations with Saccadic Muscle-Activity

Cited by 39 publications

References 33 publications

Coherent illusory contours reduce microsaccade frequency

Coherent illusory contours reduce microsaccade frequency

Dissociating neuronal gamma-band activity from cranial and ocular muscle activity in EEG

Mapping Symbols to Sounds: Electrophysiological Correlates of the Impaired Reading Process in Dyslexia

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