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Principal components analysis of Laplacian waveforms as a generic method for identifying ERP generator patterns: I. Evaluation with auditory oddball tasks
We evaluate the effectiveness and comparability of PCA-based simplifications of ERP waveforms versus their reference-free Laplacian transformations for separating task- and response-related ERP generator patterns during auditory oddball tasks. Expand
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Regional brain asymmetries in major depression with or without an anxiety disorder: A quantitative electroencephalographic study
Studies of brain activity in affective disorders need to distinguish between effects of depression and anxiety because of the substantial comorbidity of these disorders. Based on a model ofExpand
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Optimizing PCA methodology for ERP component identification and measurement: theoretical rationale and empirical evaluation
OBJECTIVE To determine how specific methodological choices affect "data-driven" simplifications of event-related potentials (ERPs) using principal components analysis (PCA). The usefulness of theExpand
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Principal components analysis of Laplacian waveforms as a generic method for identifying ERP generator patterns: II. Adequacy of low-density estimates
OBJECTIVE To evaluate the comparability of high- and low-density surface Laplacian estimates for determining ERP generator patterns of group data derived from a typical ERP sample size and paradigm.Expand
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Issues and considerations for using the scalp surface Laplacian in EEG/ERP research: A tutorial review.
  • J. Kayser, C. Tenke
  • Computer Science, Medicine
  • International journal of psychophysiology…
  • 1 September 2015
We revisit the pitfalls arising from volume conduction and the mandated arbitrary choice of EEG reference, describe the basic principle of the surface Laplacian transform in an intuitive fashion, and exemplify the differences between common reference schemes for frequently-measured EEG spectra (theta, alpha) and standard event-related potential (ERP) components, such as N1 or P3. Expand
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Religiosity and major depression in adults at high risk: a ten-year prospective study.
OBJECTIVE Previously the authors found that personal importance of religion or spirituality was associated with a lower risk for major depression in a study of adults with and without a history ofExpand
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Behavioral activation system deficits predict the six-month course of depression.
BACKGROUND Behavioral activation system (BAS) deficits are hypothesized to increase risk for depression. This study tested the hypothesis that BAS deficits, measured with both self-report andExpand
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Striate cortical contribution to the surface-recorded pattern-reversal vep in the alert monkey
The striate cortical contribution to the surface pattern-reversal visual evoked potential (VEP) was investigated in awake monkeys during performance of a visual fixation task, by examining laminarExpand
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Brain event-related potentials to complex tones in depressed patients: relations to perceptual asymmetry and clinical features.
Brain event-related potentials (ERPs) to probe tones in a dichotic complex tone test were recorded from right-handed depressed patients (n = 44) and normal subjects (n = 19) at homologous sites overExpand
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Generator localization by current source density (CSD): Implications of volume conduction and field closure at intracranial and scalp resolutions
The topographic ambiguity and reference-dependency that has plagued EEG/ERP research throughout its history are largely attributable to volume conduction, which may be concisely described by a vectorExpand
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