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Event related potential schizophrenia

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https://www.readbyqxmd.com/read/29155808/a-hierarchical-stochastic-model-for-bistable-perception
#1
Stefan Albert, Katharina Schmack, Philipp Sterzer, Gaby Schneider
Viewing of ambiguous stimuli can lead to bistable perception alternating between the possible percepts. During continuous presentation of ambiguous stimuli, percept changes occur as single events, whereas during intermittent presentation of ambiguous stimuli, percept changes occur at more or less regular intervals either as single events or bursts. Response patterns can be highly variable and have been reported to show systematic differences between patients with schizophrenia and healthy controls. Existing models of bistable perception often use detailed assumptions and large parameter sets which make parameter estimation challenging...
November 20, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29140804/exploration-of-predictive-biomarkers-for-sudden-unexplained-cardiac-death-in-nonelderly-people-a-case-control-study-with-biochemical-parameters-related-to-heart-failure
#2
Sakai Kentaro, Iwadate Kimiharu, Matsumoto Sari, Takasu Shojiro, Kanto Yuko
Sudden unexplained cardiac death (SUCD) can occasionally occur in nonelderly patients with epilepsy, psychiatric disorders, or no medical history. This study was conducted to aim to analyze whether values of the biomarkers for heart failure are associated with the SUCD. Serum concentrations of N-terminal probrain natriuretic peptide, high-sensitivity C-reactive protein (hs-CRP), and tumor necrosis factor α were analyzed in 57 nonelderly patients with SUCD who was diagnosed at medicolegal autopsy. The subjects were divided into 3 subgroups according to the medical history: (1) epilepsy, (2) psychiatric disorders, and (3) no specific medical history...
November 15, 2017: American Journal of Forensic Medicine and Pathology
https://www.readbyqxmd.com/read/29094613/the-difficulty-in-finding-relationships-between-erps-and-clinical-symptoms-of-schizophrenia
#3
Judith M Ford
It has been surprisingly difficult to find associations between neural signatures of schizophrenia and the symptoms that define it. That is, many of the legacy components of the event-related potential (ERP)- P50, N100, P200, P300-are reduced in patients with schizophrenia, in first-degree relatives of patients with schizophrenia, in schizophrenia patients early in their illness, and even in people at clinical high risk for schizophrenia. Nevertheless, these ERP components tend to be relatively insensitive to symptoms...
October 1, 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29089771/a-multicenter-open-label-pilot-study-evaluating-the-functionality-of-an-integrated-call-center-for-a-digital-medicine-system-to-optimize-monitoring-of-adherence-to-oral-aripiprazole-in-adult-patients-with-serious-mental-illness
#4
Alex Kopelowicz, Ross A Baker, Cathy Zhao, Claudette Brewer, Erica Lawson, Timothy Peters-Strickland
BACKGROUND: Medication nonadherence is common in the treatment of serious mental illness (SMI) and leads to poor outcomes. The digital medicine system (DMS) objectively measures adherence with oral aripiprazole in near-real time, allowing recognition of adherence issues. This pilot study evaluated the functionality of an integrated call center in optimizing the use of the DMS. MATERIALS AND METHODS: An 8-week, open-label, single-arm trial at four US sites enrolled adults with bipolar I disorder, major depressive disorder, and schizophrenia on stable oral aripiprazole doses and willing to use the DMS (oral aripiprazole + ingestible event marker [IEM], IEM-detecting skin patch, and software application)...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/29081922/a-tolerability-burden-index-in-schizophrenia-incorporating-patient-perspective-in-clinical-trial-adverse-event-reporting
#5
Clément François, Alice Guiraud-Diawara, Christophe Lançon, Pierre Michel Llorca, Ann Hartry, Lene Hammer-Helmich, Djamel A Zighed, Adrian Tanasescu, Mondher Toumi
Background: Adverse event (AE) reporting in clinical trials does not fully capture the patient-level perspective and comparing tolerability across treatments or among studies is difficult. Objective: This study was designed to develop a treatment tolerability index algorithm that combines AE reporting with physician- and patient-level AE information into a global burden score to allow comparison of the overall tolerability of antipsychotic medications used in treating schizophrenia. Study design: Data from a 4-arm, placebo-controlled clinical trial were used in the proposed tolerability index algorithm...
2017: Journal of Market Access & Health Policy
https://www.readbyqxmd.com/read/29065422/acute-phencyclidine-alters-neural-oscillations-evoked-by-tones-in-the-auditory-cortex-of-rats
#6
Ashley M Schnakenberg Martin, Brian F OʼDonnell, James B Millward, Jenifer L Vohs, Emma Leishman, Amanda R Bolbecker, Olga Rass, Sandra L Morzorati
BACKGROUND/AIMS: The onset response to a single tone as measured by electroencephalography (EEG) is diminished in power and synchrony in schizophrenia. Because neural synchrony, particularly at gamma frequencies (30-80 Hz), is hypothesized to be supported by the N-methyl-D-aspartate receptor (NMDAr) system, we tested whether phencyclidine (PCP), an NMDAr antagonist, produced similar deficits to tone stimuli in rats. METHODS: Experiment 1 tested the effect of a PCP dose (1...
October 24, 2017: Neuropsychobiology
https://www.readbyqxmd.com/read/29051085/40hz-auditory-steady-state-response-in-schizophrenia-sensitivity-to-stimulation-type-clicks-versus-flutter-amplitude-modulated-tones
#7
Inga Griskova-Bulanova, Kastytis Dapsys, Sigita Melynyte, Aleksandras Voicikas, Valentinas Maciulis, Sergejus Andruskevicius, Milena Korostenskaja
Auditory steady-state response (ASSR) at 40Hz has been proposed as a potential biomarker for schizophrenia. The ASSR studies in patients have used click stimulation or amplitude-modulated tones. However, the sensitivity of 40Hz ASSRs to different stimulation types in the same group of patients has not been previously evaluated. Two stimulation types for ASSRs were tested in this study: (1) 40Hz clicks and (2) flutter-amplitude modulated tones. The mean phase-locking index, evoked amplitude and event-related spectral perturbation values were compared between schizophrenia patients (n=26) and healthy controls (n=20)...
October 16, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29036701/mismatch-negativity-but-not-p300-is-associated-with-functional-disability-in-schizophrenia
#8
Holly K Hamilton, Veronica B Perez, Judith M Ford, Brian J Roach, Judith Jaeger, Daniel H Mathalon
Mismatch negativity (MMN) and P300 event-related potential (ERP) reductions in schizophrenia (SZ) reflect preattentive and attention-mediated auditory processing deficits, respectively. Although both have been linked to cognitive deficits in SZ, their relative contributions to real-world functioning are unclear. We sought to determine the functional significance of disrupted auditory processing in SZ by examining MMN and P300 in typically disabled low-functioning patients and in patients with high levels of independent role functioning...
August 3, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/29033283/developmental-trajectory-of-mismatch-negativity-and-visual-event-related-potentials-in-healthy-controls-implications-for-neurodevelopmental-vs-neurodegenerative-models-of-schizophrenia
#9
Cheryl M Corcoran, Anastasia Stoops, Migyung Lee, Antigona Martinez, Pejman Sehatpour, Elisa C Dias, Daniel C Javitt
Sensory processing deficits are core features of schizophrenia, reflected in impaired generation of event-related potential (ERP) measures such as auditory mismatch negativity (MMN) and visual P1. To understand the potential time course of development of deficits in schizophrenia, we obtained MMN to unattended duration, intensity and frequency deviants, and visual P1 to attended LSF stimuli, in 43 healthy individuals ages 6 to 25years (mean 17), and compared results to data from 30 adult schizophrenia patients (mean age 38)...
October 12, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/29033280/the-contribution-of-the-contingent-negative-variation-cnv-to-goal-maintenance
#10
Aihua Shen, Wan Zhao, Bingqian Han, Qiumei Zhang, Zhifang Zhang, Xiongying Chen, Jinguo Zhai, Min Chen, Boqi Du, Xiaoxiang Deng, Feng Ji, Chuanyue Wang, Yu-Tao Xiang, Hongjie Wu, Qi Dong, Chuansheng Chen, Jun Li
The dot pattern expectancy (DPX) task has been strongly recommended as a measure of goal maintenance, which is impaired in schizophrenia patients. The current event-related potential (ERP) study was designed mainly to identify the ERP component that could represent the goal maintenance process of the DPX task as indexed by the error rate of the BX vs. AY (EBX-AY). We focused our analysis on the cue-phased contingent negative variation (CNV) and found a significant association between the EBX-AY and the amplitude of the difference wave of cue B vs...
October 12, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28961775/brain-responses-at-encoding-predict-limited-verbal-memory-retrieval-by-persons-with-schizophrenia
#11
Julia M Longenecker, Noah C Venables, Seung Suk Kang, Kathryn A McGuire, Scott R Sponheim
Objective: Special attention has been given to verbal memory deficits in schizophrenia because they are apparent in healthy biological relatives of affected individuals, indicating a link to genetic risk for the disorder. Despite a growing consensus that encoding abnormalities contribute to poor verbal memory in the disorder, few studies have directly examined how neural responses during encoding contribute to later memory performance. Method: We evaluated event-related potentials (ERPs) during encoding of verbal material by patients with schizophrenia, healthy first-degree biological relatives of patients, and healthy controls...
September 15, 2017: Archives of Clinical Neuropsychology: the Official Journal of the National Academy of Neuropsychologists
https://www.readbyqxmd.com/read/28927552/mismatch-negativity-impairment-is-associated-with-deficits-in-identifying-real-world-environmental-sounds-in-schizophrenia
#12
Yash B Joshi, Barbara Breitenstein, Melissa Tarasenko, Michael L Thomas, Wei-Li Chang, Joyce Sprock, Richard F Sharp, Gregory A Light
BACKGROUND: Patients with schizophrenia (SZ) have impairments in processing auditory information that have been linked to deficits in cognitive and psychosocial functioning. Dysfunction in auditory sensory processing in SZ has been indexed by mismatch negativity (MMN), an event-related potential evoked by a rare, deviant stimulus embedded within a sequence of identical standard stimuli. Although MMN deficits in SZ have been studied extensively, relatively little is known about how these deficits relate to accurately identifying real-world, ecologically-salient sounds...
September 15, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28926001/ketamine-differential-neurophysiological-dynamics-in-functional-networks-in-the-rat-brain
#13
A Ahnaou, H Huysmans, R Biermans, N V Manyakov, W H I M Drinkenburg
Recently, the N-methyl-d-aspartate-receptor (NMDAR) antagonist ketamine has emerged as a fast-onset mechanism to achieve antidepressant activity, whereas its psychomimetic, dissociative and amnestic effects have been well documented to pharmacologically model schizophrenia features in rodents. Sleep-wake architecture, neuronal oscillations and network connectivity are key mechanisms supporting brain plasticity and cognition, which are disrupted in mood disorders such as depression and schizophrenia. In rats, we investigated the dynamic effects of acute and chronic subcutaneous administration of ketamine (2...
September 19, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28925523/bdnf-haplo-insufficiency-impairs-high-frequency-cortical-oscillations-in-mice
#14
Nigel C Jones, Matthew Hudson, Joshua Foreman, Gil Rind, Rachel Hill, Elizabeth E Manning, Maarten van den Buuse
Schizophrenia is a complex psychiatric disorder with a heterogeneous aetiology involving genetic and environmental factors. Deficiencies in both brain-derived neurotrophic factor (BDNF) and NMDA receptor function have been implicated in the disorder, and may play causal and synergistic roles. Perturbations in the regulation of electrophysiological signals, including high-frequency (gamma: 30-80 Hz and beta: 20-30 Hz) neuronal oscillations, are also associated with the disorder. This study investigated the influence of BDNF deficiency and NMDA receptor hypofunction on electrophysiological responses to brief acoustic stimuli...
September 19, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28904514/hyponatremia-with-olanzapine-a-suspected-association
#15
Ankur Sachdeva, Mona Choudhary
Hyponatremia is a rare, yet potentially life threatening complication of antipsychotics. Here, we report a case of a 45-year-old female diagnosed with schizophrenia who developed hyponatremia soon after addition of olanzapine to the existing treatment. This prompted us to evaluate the relationship between hyponatremia and olanzapine, as timely management is crucial. Naranjo algorithm established a "probable" causal relation between olanzapine and hyponatremia. Possible etiological reasons of this clinically significant and life threatening adverse event have been discussed...
June 25, 2017: Shanghai Archives of Psychiatry
https://www.readbyqxmd.com/read/28882471/arginine-vasopressin-improves-the-memory-deficits-in-han-chinese-patients-with-first-episode-schizophrenia
#16
Cai-Hong Geng, Chao Wang, Jun Yang, Hua Wang, Rui-Qing Ma, Xu Liu, Chang-Hong Wang
The memory impairment is a core deficit in the first-episode schizophrenia patients. Arginine vasopressin (AVP) in the brain can improve learning and memory. We performed multicentre, randomized, double-blind, placebo-controlled, parallel-group clinical trial to study the cognitive functioning in Han Chinese first-episode schizophrenic patients in a 12-week treatment regime with the intranasal administration of AVP (128 cases) or placebo (131 cases) in addition to the conventional treatment. The methods of positive and negative syndrome scale (PANSS), Wechsler memory scale-4th edition (WMS-IV) and event-related potential (ERP) were used to study the effects of AVP on the cognitive function...
September 5, 2017: Peptides
https://www.readbyqxmd.com/read/28864916/effects-of-transcranial-direct-current-stimulation-on-the-auditory-mismatch-negativity-response-and-working-memory-performance-in-schizophrenia-a-pilot-study
#17
Danielle Impey, Ashley Baddeley, Renee Nelson, Alain Labelle, Verner Knott
Cognitive impairment has been proposed to be the core feature of schizophrenia (Sz). Transcranial direct current stimulation (tDCS) is a non-invasive form of brain stimulation which can improve cognitive function in healthy participants and in psychiatric patients with cognitive deficits. tDCS has been shown to improve cognition and hallucination symptoms in Sz, a disorder also associated with marked sensory processing deficits. Recent findings in healthy controls demonstrate that anodal tDCS increases auditory deviance detection, as measured by the brain-based event-related potential, mismatch negativity (MMN), which is a putative biomarker of Sz that has been proposed as a target for treatment of Sz cognition...
November 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28845238/trait-aspects-of-auditory-mismatch-negativity-predict-response-to-auditory-training-in-individuals-with-early-illness-schizophrenia
#18
Bruno Biagianti, Brian J Roach, Melissa Fisher, Rachel Loewy, Judith M Ford, Sophia Vinogradov, Daniel H Mathalon
BACKGROUND: Individuals with schizophrenia have heterogeneous impairments of the auditory processing system that likely mediate differences in the cognitive gains induced by auditory training (AT). Mismatch negativity (MMN) is an event-related potential component reflecting auditory echoic memory, and its amplitude reduction in schizophrenia has been linked to cognitive deficits. Therefore, MMN may predict response to AT and identify individuals with schizophrenia who have the most to gain from AT...
2017: Neuropsychiatric Electrophysiology
https://www.readbyqxmd.com/read/28839337/a-phase-1-study-comparing-pharmacokinetic-and-safety-profiles-of-three-different-dose-intervals-of-aripiprazole-lauroxil
#19
Robert Risinger, Marjie Hard, Peter J Weiden
BACKGROUND: Aripiprazole lauroxil (AL) is an FDA-approved treatment for schizophrenia. AL is a non-ester prodrug of aripiprazole that results in extended systemic release of aripiprazole after intramuscular (IM) administration. This Phase-1 study evaluated the pharmacokinetics (PK) and safety of a new AL dose (1064 mg)* for 2-month dose intervals. The study also evaluated 4- and 6-week dose intervals of AL at the 441 mg and 882 mg doses, respectively. METHODS: A total of 139 patients diagnosed with schizophrenia and stabilized on a first-line antipsychotic (other than aripiprazole) were randomized to one of 3 dose/dose-interval groups: a 4-week interval of AL 441 mg (n = 35), a 6-week interval of AL 882 mg (n = 34), and an 8-week interval of AL 1064 mg IM injection (n = 70)...
August 1, 2017: Psychopharmacology Bulletin
https://www.readbyqxmd.com/read/28837639/neural-responses-to-feedback-information-produced-by-self-generated-or-other-generated-decision-making-and-their-impairment-in-schizophrenia
#20
Atsuhito Toyomaki, Naoki Hashimoto, Yuki Kako, Harumitsu Murohashi, Ichiro Kusumi
Several studies of self-monitoring dysfunction in schizophrenia have focused on the sense of agency to motor action using behavioral and psychophysiological techniques. So far, no study has ever tried to investigate whether the sense of agency or causal attribution for external events produced by self-generated decision-making is abnormal in schizophrenia. The purpose of this study was to investigate neural responses to feedback information produced by self-generated or other-generated decision-making in a multiplayer gambling task using even-related potentials and electroencephalogram synchronization...
2017: PloS One
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