Removal of eye activity artifacts from visual event-related potentials in normal and clinical subjects

Jung, Tzyy‐Ping; Makeig, Scott; Westerfield, Marissa; Townsend, Jeanne; Courchesne, Eric; Sejnowski, Terrence J.

doi:10.1016/s1388-2457(00)00386-2

Cited by 1,222 publications

(763 citation statements)

References 33 publications

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“…EEG deflections resulting from eye movements and blinks were corrected using an ICA procedure (Jung et al. 2000). Epochs with artifacts exceeding ±100 μ V amplitude in the relevant electrodes were rejected.…”

Section: Methodsmentioning

confidence: 99%

Power modulation of electroencephalogram mu and beta frequency depends on perceived level of observed actions

Simon

Mukamel

2016

Brain and Behavior

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IntroductionThe ability to understand actions and intentions of others is of great importance to social relationships and is associated with the mirror neuron system of the human brain. Whether conscious perception of specific actions is necessary to trigger activity in this system, or alternatively whether this response is independent of conscious perception is not known.MethodsWe addressed this issue by rendering videos of right hand movements invisible to conscious perception, and measuring electroencephalogram (EEG) power suppression in the mu (8–13 Hz) and beta (15–25 Hz) range as index corresponding to the magnitude of mirror neuron activity.ResultsIn the beta range over bilateral sensorimotor sites, we find that suppression indices follow the reported perceptual level of subjects with stronger suppression for consciously perceived trials. Furthermore, in the nonperceived trials, oscillation power is significantly suppressed relative to baseline. In the low mu range (8–10 Hz), oscillation power over the left sensorimotor site is significantly more suppressed in the consciously perceived versus nonperceived trials.ConclusionsOur data suggest that the intensity of mirror system responses during action observation decreases with the observers' perception level yet remains significant during observation of invisible actions. Such subliminal activity could help explain phenomena such as covert imitation.

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Section: Methodsmentioning

confidence: 99%

Power modulation of electroencephalogram mu and beta frequency depends on perceived level of observed actions

Simon

Mukamel

2016

Brain and Behavior

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“…Ocular artifacts were corrected by applying an independent component analysis [Jung et al, 2000] algorithm. Segmentation was conducted relative to marker position from À100 to 1000 ms and averaged for every subject relative to electrode position.…”

Section: Eeg Data Analysismentioning

confidence: 99%

Differences in cortical coding of heat evoked pain beyond the perceived intensity: An fMRI and EEG study

Haefeli

Freund

Kramer

et al. 2013

Human Brain Mapping

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Imaging studies have identified a wide network of brain areas activated by nociceptive stimuli and revealed differences in somatotopic representation of highly distinct stimulation sites (foot vs. hand) in the primary (S1) and secondary (S2) somatosensory cortices. Somatotopic organization between adjacent dermatomes and differences in cortical coding of similarly perceived nociceptive stimulation are less well studied. Here, cortical processing following contact heat nociceptive stimulation of cervical (C4, C6, and C8) and trunk (T10) dermatomes were recorded in 20 healthy subjects using functional magnetic resonance imaging (fMRI) and electroencephalography (EEG). Stimulation of T10 compared with the C6 and C8 revealed significant higher response intensity in the left S1 (contralateral) and the right S2 (ipsilateral) even when the perceived pain was equal between stimulation sites. Accordingly, contact heat evoked potentials following stimulation of T10 showed significantly higher N2P2 amplitudes compared to C6 and C8. Adjacent dermatomes did not reveal a distinct somatotopical representation. Within the assessed cervical and trunk dermatomes, nociceptive cortical processing to heat differs significantly in magnitude even when controlling for pain perception. This study provides evidence that controlling for pain perception is not sufficient to compare directly the magnitude of cortical processing [blood oxygen level dependence (BOLD) response and amplitude of evoked potentials] between body sites. Hum Brain Mapp 35:1379-1389,

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“…The EEG was amplified with BrainAmps DC amplifiers (BrainProducts, München), filtered with a 0.03-100 Hz bandpass, sampled at a 500 Hz rate, and re-referenced off-line to the average of right and left mastoids. Blinks and eye movements were removed from the data using a procedure based on Independent Component Analysis (ICA; Jung et al, 2000;Makeig et al, 1997). After that the data were segmented in epochs from 500 ms before critical word onset until 1200 ms after critical word onset.…”

Section: Eeg Recording and Preprocessingmentioning

confidence: 99%

Establishing reference in language comprehension: An electrophysiological perspective

Berkum¹,

Koornneef²,

Otten³

et al. 2007

Brain Research

196

214

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The electrophysiology of language comprehension has long been dominated by research on syntactic and semantic integration. However, to understand expressions like "he did it" or "the little girl", combining word meanings in accordance with semantic and syntactic constraints is not enough-readers and listeners also need to work out what or who is being referred to. We review our event-related brain potential research on the processes involved in establishing reference, and present a new experiment in which we examine when and how the implicit causality associated with specific interpersonal verbs affects the interpretation of a referentially ambiguous pronoun. The evidence suggests that upon encountering a singular noun or pronoun, readers and listeners immediately inspect their situation model for a suitable discourse entity, such that they can discriminate between having too many, too few, or exactly the right number of referents within at most half a second. Furthermore, our implicit causality findings indicate that a fragment like "David praised Linda because…" can immediately foreground a particular referent, to the extent that a subsequent "he" is at least initially construed as a syntactic error. In all, our brain potential findings suggest that referential processing is highly incremental, and not necessarily contingent upon the syntax. In addition, they demonstrate that we can use ERPs to relatively selectively keep track of how readers and listeners establish reference. IntroductionWords reliably mean things. In fact, something about word meaning is invariant enough to be listed in a dictionary. Here, for example, is what the Cambridge Advanced Learners Dictionary lists for the word "girl":girl (noun): 1. a female child or young woman, especially one still at school: "Two girls showed us round the classrooms."Of course, we all know that when a word is placed in the context of other words, shades of meaning can emerge. For "girl", some of the most familiar ones are listed in the dictionary too: girl (noun): ……… 2. a daughter: "We have two girls.", "My little girl is five." 3. [usually plural] a woman worker, especially when seen as one of a group: "shop/office girls" 4. [always plural] one of a group of female friends: "I'm going out with the girls tonight.", "The girls at work gave it to me"

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Removal of eye activity artifacts from visual event-related potentials in normal and clinical subjects

Cited by 1,222 publications

References 33 publications

Power modulation of electroencephalogram mu and beta frequency depends on perceived level of observed actions

Power modulation of electroencephalogram mu and beta frequency depends on perceived level of observed actions

Differences in cortical coding of heat evoked pain beyond the perceived intensity: An fMRI and EEG study

Establishing reference in language comprehension: An electrophysiological perspective

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