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Event related potential schizophrenia

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https://www.readbyqxmd.com/read/29765027/polygenic-pleiotropy-and-potential-causal-relationships-between-educational-attainment-neurobiological-profile-and-positive-psychotic-symptoms
#1
Yen-Feng Lin, Chia-Yen Chen, Dost Öngür, Rebecca Betensky, Jordan W Smoller, Deborah Blacker, Mei-Hua Hall
Event-related potential (ERP) components have been used to assess cognitive functions in patients with psychotic illness. Evidence suggests that among patients with psychosis there is a distinct heritable neurophysiologic phenotypic subtype captured by impairments across a range of ERP measures. In this study, we investigated the genetic basis of this "globally impaired" ERP cluster and its relationship to psychosis and cognitive abilities. We applied K-means clustering to six ERP measures to re-derive the globally impaired (n = 60) and the non-globally impaired ERP clusters (n = 323) in a sample of cases with schizophrenia (SCZ = 136) or bipolar disorder (BPD = 121) and healthy controls (n = 126)...
May 16, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29734347/single-transcranial-direct-current-stimulation-in-schizophrenia-randomized-cross-over-study-of-neurocognition-social-cognition-erps-and-side-effects
#2
Yuri Rassovsky, Walter Dunn, Jonathan K Wynn, Allan D Wu, Marco Iacoboni, Gerhard Hellemann, Michael F Green
Over the last decades, the treatment of schizophrenia has shifted fundamentally from a focus on symptom reduction to a focus on recovery and improving aspects of functioning. In this study, we examined the effect of transcranial direct current stimulation (tDCS) on social cognitive and nonsocial neurocognitive functions, as well as on electroencephalogram (EEG) measures, in individuals with schizophrenia. Thirty-seven individuals with schizophrenia were administered one of three different tDCS conditions (cathodal, anodal, and sham) per visit over the course of three visits, with approximately one week between each visit...
2018: PloS One
https://www.readbyqxmd.com/read/29730542/an-automatic-pre-processing-pipeline-for-eeg-analysis-app-based-on-robust-statistics
#3
Janir Ramos da Cruz, Vitaly Chicherov, Michael H Herzog, Patrícia Figueiredo
OBJECTIVE: With the advent of high-density EEG and studies of large numbers of participants, yielding increasingly greater amounts of data, supervised methods for artifact rejection have become excessively time consuming. Here, we propose a novel automatic pipeline (APP) for pre-processing and artifact rejection of EEG data, which innovates relative to existing methods by not only following state-of-the-art guidelines but also further employing robust statistics. METHODS: APP was tested on event-related potential (ERP) data from healthy participants and schizophrenia patients, and resting-state (RS) data from healthy participants...
April 23, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29713269/effects-of-subanesthetic-ketamine-administration-on-visual-and-auditory-event-related-potentials-erp-in-humans-a-systematic-review
#4
André Schwertner, Maxciel Zortea, Felipe V Torres, Wolnei Caumo
Ketamine is a non-competitive N-Methyl-D-Aspartate (NMDA) receptor antagonist whose effect in subanesthetic doses has been studied for chronic pain and mood disorders treatment. It has been proposed that ketamine could change the perception of nociceptive stimuli by modulating the cortical connectivity and altering the top-down mechanisms that control conscious pain perception. As this is a strictly central effect, it would be relevant to provide fresh insight into ketamine's effect on cortical response to external stimuli...
2018: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29603664/exploring-electrophysiological-correlates-of-social-cognition-in-subclinical-schizotypy
#5
Charlie Andrew Davidson, John E Kiat, Melissa Tarasenko, A Jocelyn Ritchie, Dennis Molfese, William D Spaulding
Impairments in social cognition and associated abnormalities in brain function are well documented in psychotic disorders. They may represent neurodevelopmental vulnerabilities and may therefore be present in less severe or even subclinical conditions of the schizophrenia spectrum, such as schizotypy. Schizotypy has features highly suggestive of social cognitive impairments, but little is known about possible related abnormalities of brain function. This exploratory pilot study examines electrophysiological event-related potentials (ERPs) implicated in schizophrenia, in 23 undergraduates with a range of subclinical schizotypal characteristics...
March 30, 2018: Personality and Mental Health
https://www.readbyqxmd.com/read/29596955/alterations-of-complex-mismatch-negativity-cmmn-elicited-by-a-two-tone-pattern-paradigm-in-early-phase-psychosis
#6
Emma M L Ells, Erica D Rudolph, Lauren Sculthorpe-Petley, Shelagh C Abriel, Debra J Campbell, Philip G Tibbo, Derek J Fisher
The mismatch negativity (MMN) is a component of the event-related potential (ERP) elicited by a change in auditory stimulation (e.g., the occurrence of a deviant sound that violates the rules or regularities of the preceding stimulus sequence) regardless of whether one is attending to the change or not. As such, the MMN provides a useful index of pre-attentive cognition. While decreases in MMN amplitude are robustly observed in chronic schizophrenia, these deficits are less consistently present at the early phase of the illness...
March 26, 2018: Biological Psychology
https://www.readbyqxmd.com/read/29569473/neurofeedback-based-enhancement-of-single-trial-auditory-evoked-potentials-treatment-of-auditory-verbal-hallucinations-in-schizophrenia
#7
Kathryn Rieger, Marie-Helene Rarra, Laura Diaz Hernandez, Daniela Hubl, Thomas Koenig
Auditory verbal hallucinations depend on a broad neurobiological network ranging from the auditory system to language as well as memory-related processes. As part of this, the auditory N100 event-related potential (ERP) component is attenuated in patients with schizophrenia, with stronger attenuation occurring during auditory verbal hallucinations. Changes in the N100 component assumingly reflect disturbed responsiveness of the auditory system toward external stimuli in schizophrenia. With this premise, we investigated the therapeutic utility of neurofeedback training to modulate the auditory-evoked N100 component in patients with schizophrenia and associated auditory verbal hallucinations...
March 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29546860/neurophysiological-correlates-of-excitement-in-men-with-recent-onset-psychosis
#8
Alexander Sumich, Anthony Harris, Thomas Whitford, Daniel Hermens, Nadja Heym, John Anderson, Claire Bloxsom, Fraenze Kibowski, Veena Kumari
OBJECTIVE: Right frontal function, as indicated by the N200 component of the event-related potential during target detection, has previously been associated with excitement (excitement, impulsivity, hostility, uncooperativeness) in men with a long-term diagnosis of schizophrenia. The current study investigated excitement in relation to N200 in men who had recently experienced their first episode of psychosis. SUBJECTS AND METHODS: Twenty men who had recently suffered their first psychotic episode underwent a clinical interview and auditory oddball task...
March 2018: Psychiatria Danubina
https://www.readbyqxmd.com/read/29535872/an-event-related-potentials-study-of-semantic-coherence-effect-during-episodic-encoding-in-schizophrenia-patients
#9
Lâle Battal Merlet, Alain Blanchet, Hazlin Lockman, Milena Kostova
The objective of this electrophysiological study was to investigate the processing of semantic coherence during encoding in relation to episodic memory processes promoted at test, in schizophrenia patients, by using the N400 paradigm. Eighteen schizophrenia patients and 15 healthy participants undertook a recognition memory task. The stimuli consisted of pairs of words either semantically related or unrelated to a given category name (context). During encoding, both groups exhibited an N400 external semantic coherence effect...
2018: Schizophrenia Research and Treatment
https://www.readbyqxmd.com/read/29528297/opposing-effects-of-cannabis-use-on-late-auditory-repetition-suppression-in-schizophrenia-patients-and-healthy-control-subjects
#10
Johannes Rentzsch, Golo Kronenberg, Ada Stadtmann, Andres Neuhaus, Christiane Montag, Rainer Hellweg, Maria Christiane Jockers-Scherübl
BACKGROUND: Chronic cannabis use may cause neurocognitive deficits and increase the risk of psychosis. Nevertheless, the effects of cannabis use on neurocognitive functioning in schizophrenia have remained largely unspecified. METHODS: Here, we studied repetition suppression of auditory event-related responses in a paired-stimulus design in a mixed sample of schizophrenia patients (n = 34) and healthy control subjects (n = 45) with chronic heavy cannabis use and schizophrenia patients (n = 33) and healthy control subjects (n = 61) without cannabis use...
April 2017: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29528296/effects-of-acute-ketamine-infusion-on-visual-working-memory-event-related-potentials
#11
Ivan Koychev, John Francis William Deakin, Wael El-Deredy, Corinna Haenschel
BACKGROUND: Working memory (WM) deficits are a core feature of schizophrenia. Electrophysiological studies suggest that impaired early visual processing may contribute to impaired WM in the visual domain. Abnormal N-methyl-D-aspartate (NMDA) receptor function has been implicated both in WM and in early visual processing deficits in schizophrenia. We investigated whether ketamine, a noncompetitive NMDA antagonist, would replicate in healthy volunteers the WM performance and early visual processing abnormalities we and others have reported in patients with schizophrenia...
April 2017: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29521610/visual-working-memory-encoding-in-schizophrenia-and-first-degree-relatives-neurofunctional-abnormalities-and-impaired-consolidation
#12
Michael Stäblein, Helena Storchak, Denisa Ghinea, Dominik Kraft, Christian Knöchel, David Prvulovic, Robert A Bittner, Andreas Reif, Viola Oertel-Knöchel
BACKGROUND: Working memory (WM) deficits in schizophrenia (SCZ) have been linked to impairments in the encoding phase that are associated with aberrant neuronal functioning. Similar abnormalities have been observed in unaffected first-degree relatives (REL) and are thus discussed as candidate endophenotypes. The process of WM consolidation - i.e. the formation of durable WM representations - is assumed to be impaired in SCZ, but no study has investigated WM consolidation and neuronal correlates of visual WM encoding in REL before...
March 9, 2018: Psychological Medicine
https://www.readbyqxmd.com/read/29515467/early-intervention-and-a-direction-of-novel-therapeutics-for-the-improvement-of-functional-outcomes-in-schizophrenia-a-selective-review
#13
REVIEW
Masayoshi Kurachi, Tsutomu Takahashi, Tomiki Sumiyoshi, Takashi Uehara, Michio Suzuki
Background: A recent review reported that the median proportion of patients recovering from schizophrenia was 13.5% and that this did not change over time. Various factors including the duration of untreated psychosis, cognitive impairment, negative symptoms, and morphological changes in the brain influence the functional outcome of schizophrenia. The authors herein reviewed morphological changes in the brain of schizophrenia patients, effects of early intervention, and a direction of developing novel therapeutics to achieve significant improvement of the functional outcome...
2018: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/29510167/role-of-dopamine-d3-receptor-in-alleviating-behavioural-deficits-in-animal-models-of-post-traumatic-stress-disorder
#14
Dake Song, Yaping Ge, Zhaodi Chen, Chao Shang, Ying Guo, Taiyun Zhao, Yunfeng Li, Ning Wu, Rui Song, Jin Li
Post-traumatic stress disorder (PTSD) is a complicated psychiatric disorder, which occurs after exposure to a traumatic event. The main clinical manifestation of PTSD includes fear and stress dysregulation. In both animals and humans, dysregulation of dopamine function appears to be related to conditioned fear responses. Previous studies show that the dopamine D3 receptor (D3R) is involved in schizophrenia, autism, and substance use disorders and is related to emotional disorders. However, few studies have investigated the role of the D3R in the pathogenesis and aetiology of PTSD...
June 8, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29502452/auditory-mismatch-negativity-and-p300a-elicited-by-the-optimal-multi-feature-paradigm-in-early-schizophrenia
#15
Derek J Fisher, Debra J Campbell, Shelagh C Abriel, Emma M L Ells, Erica D Rudolph, Philip G Tibbo
The mismatch negativity (MMN) is an EEG-derived event-related potential (ERP) elicited by any violation of a predicted auditory "rule," regardless of whether one is attending to the stimuli and is thought to reflect updating of the stimulus context. Redirection of attention toward a rare, distracting stimulus event, however, can be measured by the subsequent P3a component of the P300. Chronic schizophrenia patients exhibit robust MMN deficits, as well as reductions in P3a amplitude. While, the substantial literature on the MMN in first-episode and early phase schizophrenia in this population reports reduced amplitudes, there also exist several contradictory studies...
March 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29397083/when-proactivity-fails-an-electrophysiological-study-of-establishing-reference-in-schizophrenia
#16
Gina R Kuperberg, Tali Ditman, Arim Choi Perrachione
BACKGROUND: Schizophrenia is characterized by abnormalities in referential communication, which may be linked to more general deficits in proactive cognitive control. We used event-related potentials to probe the timing and nature of the neural mechanisms engaged as people with schizophrenia linked pronouns to their preceding referents during word-by-word sentence comprehension. METHODS: We measured event-related potentials to pronouns in two-clause sentences in 16 people with schizophrenia and 20 demographically matched control participants...
January 2018: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29387525/priming-production-neural-evidence-for-enhanced-automatic-semantic-activity-preceding-language-production-in-schizophrenia
#17
Gina R Kuperberg, Nathaniel Delaney-Busch, Kristina Fanucci, Trevor Blackford
Introduction: Lexico-semantic disturbances are considered central to schizophrenia. Clinically, their clearest manifestation is in language production. However, most studies probing their underlying mechanisms have used comprehension or categorization tasks. Here, we probed automatic semantic activity prior to language production in schizophrenia using event-related potentials (ERPs). Methods: 19 people with schizophrenia and 16 demographically-matched healthy controls named target pictures that were very quickly preceded by masked prime words...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29363645/effects-of-repetitive-transcranial-magnetic-stimulation-treatment-on-event-related-potentials-in-schizophrenia
#18
Xiao-Dong Lin, Xing-Shi Chen, Ce Chen, Li-Jun Zhang, Zuo-Liang Xie, Zi-Ye Huang, Guang-Dong Chen, Wan-Tao Ding, Zhi-Guang Lin, Ming-Dao Zhang, Chong Chen, Rong-Qin Wu
BACKGROUND: Repetitive transcranial magnetic stimulation (rTMS) and event-related potentials (ERPs) are a noninvasive technique that widely used in neurophysiological field. Although rTMS has shown clinical utility for a number of neurological conditions, Recently,there was little understanding of the the efficacy of rTMS on Schizophrenia(SZ) and the change of ERP between before and after rTMS treatment. The objective of this study was to investigate the characteristics of N400, mismatch negativity (MMN), and P300 before and after treatment with rTMS in SZ...
February 5, 2018: Chinese Medical Journal
https://www.readbyqxmd.com/read/29338621/assessing-the-acute-effects-of-cdp-choline-on-sensory-gating-in-schizophrenia-a-pilot-study
#19
Robert Aidelbaum, Alain Labelle, Ashley Baddeley, Verner Knott
Deficient sensory gating (SG) in schizophrenia is associated with functional outcome and offers a therapeutic target as it is linked to the altered function/expression of the α7 nicotinic acetylcholine receptors (nAChRs). This study analyzed the effects of citicoline (CDP-choline), a supplement with α7 nAChRs agonist properties, on SG in a sample of schizophrenia (SZ) patients. Using a randomized, placebo-controlled, double-blind design the dose-dependent (500 mg, 1000 mg, 2000 mg) and baseline-dependent (deficient versus normal suppressors) effects of CDP-choline on SG were examined using the P50 event-related potential (ERP) index of SG...
January 1, 2018: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/29302713/psilocybin-disrupts-sensory-and-higher-order-cognitive-processing-but-not-pre-attentive-cognitive-processing-study-on-p300-and-mismatch-negativity-in-healthy-volunteers
#20
Anna Bravermanová, Michaela Viktorinová, Filip Tylš, Tomáš Novák, Renáta Androvičová, Jakub Korčák, Jiří Horáček, Marie Balíková, Inga Griškova-Bulanova, Dominika Danielová, Přemysl Vlček, Pavel Mohr, Martin Brunovský, Vlastimil Koudelka, Tomáš Páleníček
RATIONALE: Disruption of auditory event-related evoked potentials (ERPs) P300 and mismatch negativity (MMN), electrophysiological markers of attentive and pre-attentive cognitive processing, is repeatedly described in psychosis and schizophrenia. Similar findings were observed in a glutamatergic model of psychosis, but the role of serotonergic 5-HT2A receptors in information processing is less clear. OBJECTIVES: We studied ERPs in a serotonergic model of psychosis, induced by psilocybin, a psychedelic with 5-HT2A/C agonistic properties, in healthy volunteers...
February 2018: Psychopharmacology
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