A Fundamental Investigation of the Composition of Auditory Evoked Potentials

Jervis, B.W.; Nichols, Martin J.; Johnson, Terence E.; Allen, Elizabeth S.; Hudson, N.R.

doi:10.1109/tbme.1983.325165

Cited by 146 publications

(70 citation statements)

References 8 publications

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“…To detect significant phase ordering across trials, the Rayleigh test of uniformity of angle was used (Jervis et al, 1983;Tallon-Baudry et al, 1996). This statistical test involves computing the Rayleigh's R parameter, which is mathematically identical to the ITC:…”

Section: Electrophysiological Recording and Analysismentioning

confidence: 99%

Dissociating the Effect of Noise on Sensory Processing and Overall Decision Difficulty

Bankó¹,

Gál²,

Körtvélyes³

et al. 2011

J. Neurosci.

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It has been proposed that perceptual decision making involves a task-difficulty component, which detects perceptual uncertainty and guides allocation of attentional resources. It is thought to take place immediately after the early extraction of sensory information and is specifically reflected in a positive component of the event related potentials, peaking at ϳ220 ms after stimulus onset. However, in the previous research, neural processes associated with the monitoring of overall task difficulty were confounded by those associated with the increased sensory processing demands as a result of adding noise to the stimuli. Here we dissociated the effect of phase noise on sensory processing and overall decision difficulty using a face gender categorization task. Task difficulty was manipulated either by adding noise to the stimuli or by adjusting the female/male characteristics of the face images. We found that it is the presence of noise and not the increased overall task difficulty that affects the electrophysiological responses in the first 300 ms following stimulus onset in humans. Furthermore, we also showed that processing of phase-randomized as compared to intact faces is associated with increased fMRI responses in the lateral occipital cortex. These results revealed that noise-induced modulation of the early electrophysiological responses reflects increased visual cortical processing demands and thus failed to provide support for a task-difficulty component taking place between the early sensory processing and the later sensory accumulation stages of perceptual decision making.

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Section: Electrophysiological Recording and Analysismentioning

confidence: 99%

Dissociating the Effect of Noise on Sensory Processing and Overall Decision Difficulty

Bankó¹,

Gál²,

Körtvélyes³

et al. 2011

J. Neurosci.

View full text Add to dashboard Cite

show abstract

“…Next we generate 200 TS choosing δ = 1.0( 4 ) and compute the PS index between the original first oscillator and the surrogates of the second one. As PS index we use the mean resultant length R of complex phase vectors [11],…”

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confidence: 99%

Twin surrogates to test for complex synchronisation

et al. 2006

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Abstract. -We present an approach to generate (multivariate) twin surrogates (TS) based on recurrence properties. This technique generates surrogates which correspond to an independent copy of the underlying system, i.e. they induce a trajectory of the underlying system starting at different initial conditions. We show that these surrogates are well suited to test for complex synchronisation and exemplify this for the paradigmatic system of Rössler oscillators. The proposed test enables to assess the statistical relevance of a synchronisation analysis from passive experiments which are typical in natural systems.

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“…1G). As a synchrony measure, we used the real part (rPLV) of the complex phase-locking value (PLV, Aydore et al, 2013;Jervis et al, 1983) because volume conduction and the mixing of uncorrelated signals from many sources at each electrode do not introduce systematic phase lags between the source and electrode signals.…”

Section: Montage Performance Metricsmentioning

confidence: 99%

Analysis of infant cortical synchrony is constrained by the number of recording electrodes and the recording montage

Tokariev

Vanhatalo

Palva

2016

Clinical Neurophysiology

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Dense array EEG Connectivity Brain development h i g h l i g h t sAnalysis of brain connectivity from the neonatal EEG is strongly enhanced by adding the number of electrodes. Sensitivity and specificity of cortical synchrony estimates depend on the analysis montage; average and Laplacian montage have the best performance. The number of electrodes defines the optimal montage and it also sets the limits for the level of analytic details. a b s t r a c tObjective: To assess how the recording montage in the neonatal EEG influences the detection of cortical source signals and their phase interactions. Methods: Scalp EEG was simulated by forward modeling 20-200 simultaneously active sources covering the cortical surface of a realistic neonatal head model. We assessed systematically how the number of scalp electrodes (11-85), analysis montage, or the size of cortical sources affect the detection of cortical phase synchrony. Statistical metrics were developed for quantifying the resolution and reliability of the montages. Results: The findings converge to show that an increase in the number of recording electrodes leads to a systematic improvement in the detection of true cortical phase synchrony. While there is always a ceiling effect with respect to discernible cortical details, we show that the average and Laplacian montages exhibit superior specificity and sensitivity as compared to other conventional montages. Conclusions: Reliability in assessing true neonatal cortical synchrony is directly related to the choice of EEG recording and analysis configurations. Because of the high conductivity of the neonatal skull, the conventional neonatal EEG recordings are spatially far too sparse for pertinent studies, and this loss of information cannot be recovered by re-montaging during analysis. Significance: Future neonatal EEG studies will need prospective planning of recording configuration to allow analysis of spatial details required by each study question. Our findings also advice about the level of details in brain synchrony that can be studied with existing datasets or by using conventional EEG recordings.

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A Fundamental Investigation of the Composition of Auditory Evoked Potentials

Cited by 146 publications

References 8 publications

Dissociating the Effect of Noise on Sensory Processing and Overall Decision Difficulty

Dissociating the Effect of Noise on Sensory Processing and Overall Decision Difficulty

Twin surrogates to test for complex synchronisation

Analysis of infant cortical synchrony is constrained by the number of recording electrodes and the recording montage

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