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https://www.readbyqxmd.com/read/28637195/at-issue-social-disconnection-in-schizophrenia-and-the-general-community
#1
Michael F Green, William P Horan, Junghee Lee, Amanda McCleery, L Felice Reddy, Jonathan K Wynn
Social disability is a defining characteristic of schizophrenia and a substantial public health problem. It has several components that are difficult to disentangle. One component, social disconnection, occurs extensively in the general community among nonhelp-seeking individuals. Social disconnection is an objective, long-standing lack of social/family relationships and minimal participation in social activities. It is associated with negative health effects, including early mortality, and is distinct from subjective loneliness...
June 20, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28636694/placebo-response-and-practice-effects-in-schizophrenia-cognition-trials
#2
Richard S E Keefe, Vicki G Davis, Philip D Harvey, Alexandra S Atkins, George M Haig, Owen Hagino, Stephen Marder, Dana C Hilt, Daniel Umbricht
Importance: Patients' previous experience with performance-based cognitive tests in clinical trials for cognitive impairment associated with schizophrenia can create practice-related improvements. Placebo-controlled trials for cognitive impairment associated with schizophrenia are at risk for these practice effects, which can be difficult to distinguish from placebo effects. Objectives: To conduct a systematic evaluation of the magnitude of practice effects on the Measurement and Treatment Research to Improve Cognition in Schizophrenia Consensus Cognitive Battery (MCCB) in cognitive impairment associated with schizophrenia and to examine which demographic, clinical, and cognitive characteristics were associated with improvement in placebo conditions...
June 21, 2017: JAMA Psychiatry
https://www.readbyqxmd.com/read/28635556/executive-control-in-schizophrenia-a-preliminary-study-on-the-moderating-role-of-comt-val158met-for-comorbid-alcohol-and-substance-use-disorders
#3
Giuseppe Carrà, Gabriella Nicolini, Cristina Crocamo, Annamaria Lax, Francesca Amidani, Francesco Bartoli, Filippo Castellano, Alessia Chiorazzi, Giulia Gamba, Costanza Papagno, Massimo Clerici
BACKGROUND: A functional polymorphism in the catechol-O-methyltransferase (COMT) gene (Val158Met) appears to influence cognition in people with alcohol/substance use disorders (AUD/SUD) and in those with psychosis. METHODS: To explore the potential moderating effect of these factors, a cross-sectional study was conducted, randomly recruiting subjects with DSM-IV diagnosis of schizophrenia. AUD/SUD was rigorously assessed, as well as COMT Val158Met polymorphism. Executive control functioning was measured using the Intra-Extra Dimensional Set Shift (IED)...
February 14, 2017: Nordic Journal of Psychiatry
https://www.readbyqxmd.com/read/28634459/cognitive-correlates-of-different-mentalizing-abilities-in-individuals-with-high-and-low-trait-schizotypy-findings-from-an-extreme-group-design
#4
Krisztina Kocsis-Bogár, Simone Kotulla, Susanne Maier, Martin Voracek, Kristina Hennig-Fast
Mentalizing or Theory of Mind (ToM) deficits in schizophrenia have been studied to great extent, but studies involving samples of trait schizotypy yield ambiguous results. Executive functions like cognitive inhibition, cognitive flexibility, and agency are all prerequisites of mentalizing, and it is assumed that the impairment of these functions contributes to ToM deficits in schizophrenia. Whether these impairments influence the ToM performance of people with high trait schizotypy remains unclear. Although impaired self-agency has repeatedly been identified in people with schizotypy, its role in mentalizing is yet to be investigated...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28634445/antioxidant-treatment-with-n-acetyl-cysteine-prevents-the-development-of-cognitive-and-social-behavioral-deficits-that-result-from-perinatal-ketamine-treatment
#5
Aarron Phensy, Hasmik E Duzdabanian, Samantha Brewer, Anurag Panjabi, Christopher Driskill, Annuska Berz, George Peng, Sven Kroener
Alterations of the normal redox state can be found in all stages of schizophrenia, suggesting a key role for oxidative stress in the etiology and maintenance of the disease. Pharmacological blockade of N-methyl-D-aspartic acid (NMDA) receptors can disrupt natural antioxidant defense systems and induce schizophrenia-like behaviors in animals and healthy human subjects. Perinatal administration of the NMDA receptor (NMDAR) antagonist ketamine produces persistent behavioral deficits in adult mice which mimic a range of positive, negative, and cognitive symptoms that characterize schizophrenia...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28634109/cannabis-associated-psychosis-neural-substrate-and-clinical-impact
#6
REVIEW
R M Murray, A Englund, A Abi-Dargham, D Lewis, M Di Forti, C Davies, M Sherif, P McGuire, C D'Souza
Prospective epidemiological studies have consistently demonstrated that cannabis use is associated with an increased subsequent risk of both psychotic symptoms and schizophrenia-like psychoses. Early onset of use, daily use of high-potency cannabis, and synthetic cannabinoids carry the greatest risk. The risk-increasing effects are not explained by shared genetic predisposition between schizophrenia and cannabis use. Experimental studies in healthy humans show that cannabis and its active ingredient, delta-9-tetrahydrocannabinol (THC), can produce transient, dose-dependent, psychotic symptoms, as well as an array of psychosis-relevant behavioral, cognitive and psychophysiological effects; the psychotogenic effects can be ameliorated by cannabidiol (CBD)...
June 17, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28634108/disturbances-of-novel-object-exploration-and-recognition-in-a-chronic-ketamine-mouse-model-of-schizophrenia
#7
Maria Jelena Hauser, Dirk Isbrandt, Jochen Roeper
Schizophrenia is a chronic and devastating disease with an overall lifetime risk of 1%. While positive symptoms of schizophrenia such as hallucinations and delusions are reduced by antipsychotic medication based on the inhibition of type 2 dopaminergic receptors (D2R), negative symptoms (e.g. reduced motivation) and cognitive symptoms (e.g. impaired working memory) of schizophrenia are not effectively treated by current medication. This dichotomy might arise in part because of our limited understanding of the pathophysiology of negative and cognitive symptoms in schizophrenia...
June 17, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28634088/duration-of-untreated-psychosis-and-neurocognition-in-first-episode-psychosis-a-meta-analysis
#8
REVIEW
Emre Bora, Berna Yalincetin, Berna Binnur Akdede, Koksal Alptekin
Neurocognitive impairment is a well-established feature of first-episode psychosis (FEP). Neurotoxicity hypothesis of psychosis suggests that untreated psychosis before the initiation of first effective treatment is associated with loss of acquired cognitive abilities. However, the outcome of the studies investigating the relationship between duration of untreated psychosis (DUP) and cognitive impairment in FEP remains inconclusive. No previous meta-analysis investigating the relationship between DUP and cognitive impairment in FEP has been published...
June 17, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28634087/treatment-with-levetiracetam-improves-cognition-in-a-ketamine-rat-model-of-schizophrenia
#9
Ming Teng Koh, Yi Shao, Sharon Rosenzweig-Lipson, Michela Gallagher
Imbalance in neural excitation and inhibition is associated with behavioral dysfunction in individuals with schizophrenia and at risk for this illness. We examined whether targeting increased neural activity with the antiepileptic agent, levetiracetam, would benefit memory performance in a preclinical model of schizophrenia that has been shown to exhibit hyperactivity in the hippocampus. Adult rats exposed to ketamine subchronically during late adolescence showed impaired hippocampal-dependent memory performance...
June 17, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28633055/face-related-visual-search-deficits-in-first-episode-schizophrenia
#10
Shenglin She, Bei Zhang, Xuanzi Li, Xiaofei Zhang, Ruikeng Li, Juanhua Li, Taiyong Bi, Yingjun Zheng
Schizophrenia is considered a complex illness with multiple cognitive dysfunctions, including a deficit in visual processing. However, whether the deficiency of visual processing in schizophrenia is general across stimuli or stimulus-specific remains the subject of debate. In the current study, eighteen first-episode schizophrenic patients and eighteen healthy controls participated in three visual search tasks in which they were asked to search a specific target of a triangle, face identity or facial affect...
June 15, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28630456/rare-disruptive-variants-in-the-disc1-interactome-and-regulome-association-with-cognitive-ability-and-schizophrenia
#11
S Teng, P A Thomson, S McCarthy, M Kramer, S Muller, J Lihm, S Morris, D C Soares, W Hennah, S Harris, L M Camargo, V Malkov, A M McIntosh, J K Millar, D H Blackwood, K L Evans, I J Deary, D J Porteous, W R McCombie
Schizophrenia (SCZ), bipolar disorder (BD) and recurrent major depressive disorder (rMDD) are common psychiatric illnesses. All have been associated with lower cognitive ability, and show evidence of genetic overlap and substantial evidence of pleiotropy with cognitive function and neuroticism. Disrupted in schizophrenia 1 (DISC1) protein directly interacts with a large set of proteins (DISC1 Interactome) that are involved in brain development and signaling. Modulation of DISC1 expression alters the expression of a circumscribed set of genes (DISC1 Regulome) that are also implicated in brain biology and disorder...
June 20, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28628794/neurological-soft-signs-but-not-theory-of-mind-and-emotion-recognition-deficit-distinguished-children-with-adhd-from-healthy-control
#12
Mariabernarda Pitzianti, Clementina Grelloni, Livia Casarelli, Elisa D'Agati, Simonetta Spiridigliozzi, Paolo Curatolo, Augusto Pasini
Attention Deficit Hyperactivity Disorder (ADHD) is associated with social cognition impairment, executive dysfunction and motor abnormalities, consisting in the persistence of neurological soft signs (NSS). Theory of mind (ToM) and emotion recognition (ER) deficit of children with ADHD have been interpreted as a consequence of their executive dysfunction, particularly inhibitory control deficit. To our knowledge, there are not studies that evaluate the possible correlation between the ToM and ER deficit and NSS in the population with ADHD, while this association has been studied in other psychiatric disorders, such as schizophrenia...
June 12, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28628790/associated-illness-severity-in-schizophrenia-and-diabetes-mellitus-a-systematic-review
#13
REVIEW
Benjamin I Perry, Dhanya Salimkumar, Daniel Green, Anne Meakin, Andrew Gibson, Deepali Mahajan, Tayyeb Tahir, Swaran P Singh
OBJECTIVE: We aimed to elucidate whether schizophrenia and type II diabetes mellitus may present with associated illness severity, in light of accumulating evidence to suggest both conditions have important shared inflammatory components with many shared inflammatory genetic factors. METHODS: We conducted a systematic review employing PRISMA criteria, searching EMBASE, Ovid MEDLINE, PsychInfo, Web of Science and Google Scholar to February 1st, 2017, for clinical studies assessing schizophrenia severity alongside dysglycaemia...
June 13, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28628228/epigenetic-mechanisms-underlying-nmda-receptor-hypofunction-in-the-prefrontal-cortex-of-juvenile-animals-in-the-mam-model-for-schizophrenia
#14
Yelena Gulchina, Song-Jun Xu, Melissa A Snyder, Felice Elefant, Wen-Jun Gao
Schizophrenia (SCZ) is characterized not only by psychosis, but also by working memory and executive functioning deficiencies, processes that rely on the prefrontal cortex (PFC). Because these cognitive impairments emerge prior to psychosis onset, we investigated synaptic function during development in the neurodevelopmental methylazoxymethanol acetate (MAM) model for SCZ. Specifically, we hypothesize that NMDAR hypofunction is attributable to reductions in the NR2B subunit through aberrant epigenetic regulation of gene expression, resulting in deficient synaptic physiology and PFC-dependent cognitive dysfunction, a hallmark of SCZ...
June 19, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28626937/glutamatergic-regulation-of-cognition-and-functional-brain-connectivity-insights-from-pharmacological-genetic-and-translational-schizophrenia-research
#15
REVIEW
Maria R Dauvermann, Graham Lee, Neil Dawson
The pharmacological modulation of glutamatergic neurotransmission to improve cognitive function has been a focus of intensive research, particularly in relation to the cognitive deficits seen in schizophrenia. Despite this effort there has been little success in the clinical use of glutamatergic compounds as procognitive drugs. Here we review a selection of the drugs used to modulate glutamatergic signalling and how they impact on cognitive function in rodents and humans. We highlight how glutamatergic dysfunction, and NMDA receptor hypofunction in particular, is a key mechanism contributing to the cognitive deficits observed in schizophrenia, and outline some of the glutamatergic targets that have been tested as putative procognitive targets for the disorder...
June 18, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28626392/sensing-the-worst-neurophenomenological-perspectives-on-neutral-stimuli-misperception-in-schizophrenia-spectrum
#16
Mariateresa Sestito, Josef Parnas, Carlo Maggini, Vittorio Gallese
While investigating social cognitive impairments in schizophrenia, prominent evidence has been found that patients with schizophrenia show a tendency to misclassify neutral stimuli as negatively valenced. Within this population, patients presenting delusions are more prone to this phenomenon. In a previous study, Schizophrenia spectrum (SzSp) patients rated positive, negative and neutral stimuli that were multimodally presented, while assessed with a checklist exploring anomalous subjective experiences and evaluated for positive and negative symptomatology...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28626273/combined-antipsychotics-and-electroconvulsive-therapy-in-an-acutely-psychotic-patient-with-treatment-resistant-schizophrenia
#17
Ruth Rayikanti, Iga Lentowicz, Badari Birur, Li Li
Treatment of patients with Treatment-resistant Schizophrenia (TRS), who fail to respond to multiple antipsychotic trials, including clozapine (CLZ), is challenging. Several alternative strategies are reported in studies, one of which includes augmenting antipsychotics (AP) with Electroconvulsive therapy (ECT). We discuss a case of an acutely psychotic patient with TRS who responded effectively and sustained remission to this strategy which was ECT combined with two AP, CLZ and aripiprazole. Notable improvement in clinical and cognitive outcomes was seen with just five right unilateral ECT sessions, CLZ titrated up to 62...
May 15, 2017: Psychopharmacology Bulletin
https://www.readbyqxmd.com/read/28625216/symptom-rating-scales-for-schizophrenia-and-other-primary-psychotic-disorders-in-icd-11
#18
J W Keeley, W Gaebel
The subtype system for categorising presentations of schizophrenia will be removed from International Classification of Diseases 11th Revision. In its place will be a system for rating six domains of psychotic disorder pathology: positive symptoms, negative symptoms, depressive symptoms, manic symptoms, psychomotor symptoms and cognitive symptoms. This paper outlines the rationale and description of the proposed symptom rating scale, including current controversies. In particular, the scale could adopt either a 4-point severity rating or a 2-point presence/absence rating...
June 19, 2017: Epidemiology and Psychiatric Sciences
https://www.readbyqxmd.com/read/28625185/deterioration-of-visuospatial-associative-memory-following-a-first-psychotic-episode-a-long-term-follow-up-study
#19
C M J Wannan, C F Bartholomeusz, V L Cropley, T E Van Rheenen, A Panayiotou, W J Brewer, T M Proffitt, L Henry, M G Harris, D Velakoulis, P McGorry, C Pantelis, S J Wood
BACKGROUND: Cognitive deficits are a core feature of schizophrenia, and impairments in most domains are thought to be stable over the course of the illness. However, cross-sectional evidence indicates that some areas of cognition, such as visuospatial associative memory, may be preserved in the early stages of psychosis, but become impaired in later established illness stages. This longitudinal study investigated change in visuospatial and verbal associative memory following psychosis onset...
June 19, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28624138/serum-ncam-levels-and-cognitive-deficits-in-first-episode-schizophrenia-patients-versus-health-controls
#20
HuiMei An, LuPing Zhou, Yinghua Yu, Hongzhen Fan, FengMei Fan, Shuping Tan, ZhiRen Wang, Boz Z, Jing Shi, FuDe Yang, Xiangyang Zhang, Yunlong Tan, Xu-Feng Huang
BACKGROUND: Neural cell adhesion molecule (NCAM) is a glycoprotein and plays an important role in cell-cell adhesion, neural migration, neurite outgrowth, synaptic plasticity and brain development. We investigated the relationship between the serum NCAM concentration and cognitive deficit in first episode drug naïve schizophrenia (FES) patients. METHODS: Thirty FES patients and thirty healthy controls were recruited for this study. Psychiatric symptoms were assessed by the positive and negative syndrome scale (PANSS)...
June 15, 2017: Schizophrenia Research
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