Auditory event-related potentials and α oscillations in the psychosis prodrome: neuronal generator patterns during a novelty oddball task.
- Authors
- Kayser, Jürgen; Tenke, Craig E; Kroppmann, Christopher J; Alschuler, Daniel M; Fekri, Shiva; Ben-David, Shelly; Corcoran, Cheryl M; Bruder, Gerard E
- Year
- 2014
- Journal
- International journal of psychophysiology : official journal of the International Organization of Psychophysiology
- PMID
- 24333745
- DOI
- 10.1016/j.ijpsycho.2013.12.003
- PMCID
- PMC3990501
Prior research suggests that event-related potentials (ERP) obtained during active and passive auditory paradigms, which have demonstrated abnormal neurocognitive function in schizophrenia, may provide helpful tools in predicting transition to psychosis. In addition to ERP measures, reduced modulations of EEG alpha, reflecting top-down control required to inhibit irrelevant information, have revealed attentional deficits in schizophrenia and its prodromal stage. Employing a three-stimulus novelty oddball task, nose-referenced 48-channel ERPs were recorded from 22 clinical high-risk (CHR) patients and 20 healthy controls detecting target tones (12% probability, 500Hz; button press) among nontargets (76%, 350Hz) and novel sounds (12%). After current source density (CSD) transformation of EEG epochs (-200 to 1000ms), event-related spectral perturbations were obtained for each site up to 30Hz and 800ms after stimulus onset, and simplified by unrestricted time-frequency (TF) principal components analysis (PCA). Alpha event-related desynchronization (ERD) as measured by TF factor 610-9 (spectral peak latency at 610ms and 9Hz; 31.9% variance) was prominent over right posterior regions for targets, and markedly reduced in CHR patients compared to controls, particularly in three patients who later developed psychosis. In contrast, low-frequency event-related synchronization (ERS) distinctly linked to novels (260-1; 16.0%; mid-frontal) and N1 sink across conditions (130-1; 3.4%; centro-temporoparietal) did not differ between groups. Analogous time-domain CSD-ERP measures (temporal PCA), consisting of N1 sink, novelty mismatch negativity (MMN), novelty vertex source, novelty P3, P3b, and frontal response negativity, were robust and closely comparable between groups. Novelty MMN at FCz was, however, absent in the three converters. In agreement with prior findings, alpha ERD and MMN may hold particular promise for predicting transition to psychosis among CHR patients.
Grand mean surface Laplacian (CSD) waveforms (−100 to 1000 ms, 100 ms pre-stimulus baseline) for 22 clinical high-risk patients comparing nontarget, target, and novel stimuli at all 49 recording sites. Horizontal and vertical electrooculograms (EOG) are shown before blink correction.
CSD waveforms at selected midline sites (Fz, Cz, Pz) for target and novel stimuli comparing 22 patients and 20 controls. Three prominent CSD components are labeled for novels at site Cz (NVS: novelty vertex source) and for targets at sites Pz (P3b) and Fz (FRN: frontal response negativity).
(A) Factor loadings of the first six temporal PCA (tPCA) factors (with explained variance) extracted from the time-locked CSD waveforms (N = 42). Factor labels reflect the peak latency [ms] of the factor loadings. (B) CSD factor score topographies corresponding to N1 sink (135 ms peak latency of factor loading), temporal N1 sink (185 ms), novelty vertex source (NVS; 255 ms), P3b source (350 ms), and frontal response negativity (FRN; 505 ms) comparing nontarget, target and novel stimuli (pooled across all 42 participants; for separate topographies for each group, see supplementary Fig. S1). All topographies are two-dimensional representations of spherical spline interpolations (m = 2; λ = 0) derived from the mean factors scores for each recording site.
Grand mean surface Laplacian (CSD) event-related spectral perturbation (ERSP) plots (−10 to 800 ms; 1 to 30 Hz) at all 49 recording sites for 22 patients (top) and 20 controls (bottom) for each condition (nontarget, target, novel). Distinct event-related synchronization (ERS) for target and novel stimuli between 100 and 400 ms is evident for both groups at anterior sites. In contrast, event-related desynchronization (ERD) is most prominent for target stimuli between 400 and 800 ms over posterior sites, and appears to be reduced for patients compared to controls.
CSD-ERSP plots at selected sites (FCz, CP2) for target and novel stimuli and 22 patients and 20 controls.
(A) Factor loadings of three time-frequency PCA (tfPCA) factors (with explained variance) extracted from the time-frequency CSD matrices (N = 42). Factor labels reflect both peak latency [ms] and peak frequency [Hz] of the factor loadings. (B) CSD factor score topographies corresponding to alpha event-related desynchronization (ERD; factor 610–9), novelty vertex source (NVS) event-related synchronization (ERS; factor 260–1), and N1 sink ERS (factor 130–1) comparing nontarget, target and novel stimuli for 22 patients and 20 controls. All topographies are two-dimensional representations of spherical spline interpolations (m = 2; λ = 0) derived from the mean factors scores for each recording site.
Observations for CHR individuals who developed threshold psychosis within a 4-year follow-up period (n = 3). (A) CSD waveforms at selected midline sites (Cz, Pz) for nontarget, target and novel stimuli (scale as in Fig. 3). A prominent P3b source for targets at Pz and novelty vertex source (NVS) at Cz indicated robust condition effects, although the novelty MMN, which partially overlaps and follows N1 sink for the overall sample, is absent (grayed area). (B) CSD-ERSP plots at selected sites (FCz, CP2) for nontarget, target and novel stimuli (scale as in Fig. 6). Contour lines for nontarget stimuli depict tfPCA factor loadings (50% maximum; Fig. 7A) for N1 ERS (factor 130–1), and NVS ERS (260–1) at FCz and alpha ERD (610–9) at CP2 for target and novel stimuli. Note that alpha ERD is virtually absent.
(A) Novel CSD waveforms (−100 to 800 ms) at midline sites (FCz, Cz), where MMN and NVS were most prominent, for healthy controls (gray lines) and CHR patients with (red lines) and without (green lines) transition to psychosis. (B) Novel-minus-nontarget difference CSDs at FCz reveal a robust novelty MMN for controls and nonconverters, whereas ΔMMN is absent for three converters.
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