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schizophrenia cognition

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https://www.readbyqxmd.com/read/28108498/mglur2-versus-mglur3-metabotropic-glutamate-receptors-in-primate-dorsolateral-prefrontal-cortex-postsynaptic-mglur3-strengthen-working-memory-networks
#1
Lu E Jin, Min Wang, Veronica C Galvin, Taber C Lightbourne, Peter Jeffrey Conn, Amy F T Arnsten, Constantinos D Paspalas
The newly evolved circuits in layer III of primate dorsolateral prefrontal cortex (dlPFC) generate the neural representations that subserve working memory. These circuits are weakened by increased cAMP-K(+) channel signaling, and are a focus of pathology in schizophrenia, aging, and Alzheimer's disease. Cognitive deficits in these disorders are increasingly associated with insults to mGluR3 metabotropic glutamate receptors, while reductions in mGluR2 appear protective. This has been perplexing, as mGluR3 has been considered glial receptors, and mGluR2 and mGluR3 have been thought to have similar functions, reducing glutamate transmission...
January 19, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28107668/neurotrophins-role-in-depressive-symptoms-and-executive-function-performance-association-analysis-of-nrn1-gene-and-its-interaction-with-bdnf-gene-in-a-non-clinical-sample
#2
C Prats, B Arias, G Ortet, M I Ibáñez, J Moya, E Pomarol-Clotet, L Fañanás, M Fatjó-Vilas
BACKGROUND: Neuritin-1 is a neurotrophic factor involved in synaptic plasticity that has been associated with depressive disorders, schizophrenia and cognitive performance. The study of genotype-phenotype relationships in healthy individuals is a useful framework to investigate the etiology of brain dysfunctions. We therefore aimed to investigate in a non-clinical sample whether NRN1 gene contributes to the psychopathological profile, with a particular focus on the clinical dimensions previously related to the NRN1 gene (i...
November 23, 2016: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28105267/potential-treatment-of-cognitive-impairment-in-schizophrenia-by-phosphodiesterase-2-pde2-inhibitors
#3
EDITORIAL
Ahmed F Abdel-Magid
No abstract text is available yet for this article.
January 12, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28104564/evidence-that-communication-impairment-in-schizophrenia-is-associated-with-generalized-poor-task-performance
#4
Anne M Merrill, Nicole R Karcher, David C Cicero, Theresa M Becker, Anna R Docherty, John G Kerns
People with schizophrenia exhibit wide-ranging cognitive deficits, including slower processing speed and decreased cognitive control. Disorganized speech symptoms, such as communication impairment, have been associated with poor cognitive control task performance (e.g., goal maintenance and working memory). Whether communication impairment is associated with poorer performance on a broader range of non-cognitive control measures is unclear. In the current study, people with schizophrenia (n =51) and non-psychiatric controls (n =26) completed speech interviews allowing for reliable quantitative assessment of communication impairment...
January 6, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28104562/assessing-patient-rated-vs-clinician-rated-adherence-to-the-therapy-in-treatment-resistant-schizophrenia-schizophrenia-responders-and-non-schizophrenia-patients
#5
Felice Iasevoli, Andrea Fagiolini, Maria Vittoria Formato, Emiliano Prinzivalli, Sara Giordano, Raffaele Balletta, Vincenzo De Luca, Andrea de Bartolomeis
The present study evaluated consistency, reliability, and determinants of two real-world measures of adherence to prescription in 57 schizophrenia and 61 non-schizophrenia patients. Treatment resistant schizophrenia (TRS) was additionally diagnosed in 28 of the schizophrenia patients. Patients were screened for clinical severity, cognitive functioning, and adherence by 10-item Drug Attitude Inventory (DAI-10) or Adherence-to-Therapy (AtT), a clinician-rated tool developed by our group. DAI-10 and AtT scores showed a significant correlation (p=0...
January 7, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28103961/a-review-of-altered-biochemistry-in-the-anterior-cingulate-cortex-of-first-episode-psychosis
#6
L Squarcina, J A Stanley, M Bellani, C A Altamura, P Brambilla
Relevant biochemicals of the brain can be quantified in vivo, non-invasively, using proton Magnetic Resonance Spectroscopy (¹H MRS). This includes metabolites associated with neural general functioning, energetics, membrane phospholipid metabolism and neurotransmission. Moreover, there is substantial evidence of implication of the frontal and prefrontal areas in the pathogenesis of psychotic disorders such as schizophrenia. In particular, the anterior cingulate cortex (ACC) plays an important role in cognitive control of emotional and non-emotional processes...
January 20, 2017: Epidemiology and Psychiatric Sciences
https://www.readbyqxmd.com/read/28103519/do-cognitive-schema-mediate-the-association-between-childhood-trauma-and-being-at-ultra-high-risk-for-psychosis
#7
E Appiah-Kusi, H L Fisher, N Petros, R Wilson, V Mondelli, P A Garety, P Mcguire, S Bhattacharyya
Exposure to childhood trauma has been associated with psychotic symptoms, being at ultra-high risk for psychosis (UHR), and psychotic disorders such as schizophrenia. Negative self-beliefs have been shown to partially mediate the relationship between childhood trauma and paranoia and have been shown to be characteristic of patients with psychosis. However, whether the association between childhood trauma and being at high risk of developing psychosis (e.g., UHR) and paranoia symptoms is mediated by altered cognitive schema is unknown and warrants investigation to inform preventive interventions...
January 6, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28100276/realising-stratified-psychiatry-using-multidimensional-signatures-and-trajectories
#8
Dan W Joyce, Angie A Kehagia, Derek K Tracy, Jessica Proctor, Sukhwinder S Shergill
BACKGROUND: Stratified or personalised medicine targets treatments for groups of individuals with a disorder based on individual heterogeneity and shared factors that influence the likelihood of response. Psychiatry has traditionally defined diagnoses by constellations of co-occurring signs and symptoms that are assigned a categorical label (e.g. schizophrenia). Trial methodology in psychiatry has evaluated interventions targeted at these categorical entities, with diagnoses being equated to disorders...
January 18, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28099526/executive-functioning-in-men-with-schizophrenia-and-substance-use-disorders-influence-of-lifetime-suicide-attempts
#9
Ana Adan, Maria Del Mar Capella, Gemma Prat, Diego A Forero, Silvia López-Vera, José Francisco Navarro
BACKGROUND: Lifetime suicide attempts in patients with comorbidity between psychotic disorders and Substance Use Disorder (SUD), known as dual diagnosis, was associated with a worse clinical and cognitive state, poor prognosis and premature death. However, to date no previous study has examined the cognitive performance of these patients considering as independent the presence or absence of lifetime suicide attempts. METHODS: We explore executive functioning differences between suicide attempters and non-attempters in dual schizophrenia (DS) patients and the possible related factors for both executive performance and current suicide risk...
2017: PloS One
https://www.readbyqxmd.com/read/28097738/enhanced-predictive-signalling-in-schizophrenia
#10
Katharina Schmack, Marcus Rothkirch, Josef Priller, Philipp Sterzer
Positive symptoms of schizophrenia such as delusions and hallucinations are thought to arise from an alteration in predictive mechanisms of the brain. Here, we empirically tested the hypothesis that schizophrenia is associated with an enhanced signalling of higher-level predictions that shape perception into conformity with acquired beliefs. Twenty-one patients with schizophrenia and twenty-eight healthy controls matched for age and gender took part in a functional magnetic resonance imaging (fMRI) experiment that assessed the effect of an experimental manipulation of cognitive beliefs on the perception of an ambiguous visual motion stimulus...
January 18, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28096881/design-and-methodology-of-the-korean-early-psychosis-cohort-study
#11
Sung-Wan Kim, Bong Ju Lee, Jung Jin Kim, Je-Chun Yu, Kyu Young Lee, Seung-Hee Won, Seung-Hwan Lee, Seung-Hyun Kim, Shi Hyun Kang, Young-Chul Chung
The present study details the rationale and methodology of the Korean Early Psychosis Cohort Study (KEPS), which is a clinical cohort investigation of first episode psychosis patients from a Korean population. The KEPS is a prospective naturalistic observational cohort study that follows the participants for at least 2 years. This study includes patients between 18 and 45 years of age who fulfill the criteria for one of schizophrenia spectrum and other psychotic disorders according to the diagnostic criteria of DSM-5...
January 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/28096876/effectiveness-of-electroconvulsive-therapy-augmentation-on-clozapine-resistant-schizophrenia
#12
Hye Sung Kim, Se Hyun Kim, Nam Young Lee, Tak Youn, Jeoung Hyuk Lee, Seunghyun Chung, Yong Sik Kim, In Won Chung
OBJECTIVE: This retrospective case series study of the effectiveness of electroconvulsive therapy (ECT) augmentation on clozapine-resistant schizophrenia was conducted by EMR review. METHODS: Clozapine-resistance was defined as persistent psychotic symptoms despite at least 12 weeks of clozapine administration with blood levels over 350 ng/mL in order to rule out pseudo-resistance. Seven in-patients who were taking clozapine and treated with ECT were selected. We analyzed the psychopathology and subscales changed by ECT...
January 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/28096678/risperidone-improves-interpersonal-perception-and-executive-function-in-patients-with-schizophrenia
#13
Zhenhe Zhou, Yuanyuan Zhu, Jun Wang, Hongmei Zhu
OBJECTIVE: To investigate whether risperidone improves social cognitive impairments and executive dysfunction in people with schizophrenia. METHODS: Fifty-six patients who met the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, diagnostic criteria for schizophrenia were allocated to a risperidone treatment group (RTG, n=28) and a typical antipsychotic treatment group (TATG, n=28). Twenty-eight healthy volunteers were recruited as the normal control group (NCG)...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28096412/transmembrane-protein-108-is-required-for-glutamatergic-transmission-in-dentate-gyrus
#14
Hui-Feng Jiao, Xiang-Dong Sun, Ryan Bates, Lei Xiong, Lei Zhang, Fang Liu, Lei Li, Hong-Sheng Zhang, Shun-Qi Wang, Ming-Tao Xiong, Mihir Patel, Alexis M Stranahan, Wen-Cheng Xiong, Bao-Ming Li, Lin Mei
Neurotransmission in dentate gyrus (DG) is critical for spatial coding, learning memory, and emotion processing. Although DG dysfunction is implicated in psychiatric disorders, including schizophrenia, underlying pathological mechanisms remain unclear. Here we report that transmembrane protein 108 (Tmem108), a novel schizophrenia susceptibility gene, is highly enriched in DG granule neurons and its expression increased at the postnatal period critical for DG development. Tmem108 is specifically expressed in the nervous system and enriched in the postsynaptic density fraction...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28096070/a-comparative-study-of-tower-of-london-scoring-systems-and-normative-data
#15
Jiri Michalec, Ondrej Bezdicek, Tomas Nikolai, Pavel Harsa, Robert Jech, Petr Silhan, Martin Hyza, Evzen Ruzicka, Tim Shallice
OBJECTIVE: Tower of London (ToL) is a planning ability task that includes multiple versions. The original ToL was developed by Shallice together with two scoring systems (ToL-SS). Another two ToL-SS were proposed by Anderson et al. and Krikorian et al. The purpose of this study is to provide normative data for four ToL-SS and explore the effects of demographic variables on ToL performance. Furthermore, we aimed to determine the discriminative validity of these ToL-SS in clinical samples...
January 17, 2017: Archives of Clinical Neuropsychology: the Official Journal of the National Academy of Neuropsychologists
https://www.readbyqxmd.com/read/28095997/abnormal-prefrontal-and-parietal-activity-linked-to-deficient-active-binding-in-working-memory-in-schizophrenia
#16
Stéphanie Grot, Virginie Petel Légaré, Olivier Lipp, Isabelle Soulières, Florin Dolcos, David Luck
Working memory deficits have been widely reported in schizophrenia, and may result from inefficient binding processes. These processes, and their neural correlates, remain understudied in schizophrenia. Thus, we designed an FMRI study aimed at investigating the neural correlates of both passive and active binding in working memory in schizophrenia. Nineteen patients with schizophrenia and 23 matched controls were recruited to perform a working memory binding task, in which they were instructed to memorize three letters and three spatial locations...
January 14, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28095813/vocational-rehabilitation-for-adults-with-psychotic-disorders-in-a-scandinavian-welfare-society
#17
Erik Falkum, Ole Klungsøyr, June Ullevoldsæter Lystad, Helen Christine Bull, Stig Evensen, Egil W Martinsen, Svein Friis, Torill Ueland
BACKGROUND: This study examined the outcomes of a vocational rehabilitation program (The Job Management Program, JUMP) for persons with psychotic disorders based on close collaboration between health and welfare services. METHODS: Participants (N = 148) with broad schizophrenia spectrum disorders (age 18-65) were recruited from six counties in Norway. Three counties were randomized to vocational rehabilitation augmented with cognitive behaviour therapy (CBT), while the remaining three counties were randomized to vocational rehabilitation augmented with cognitive remediation (CR)...
January 17, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28094171/the-relationship-of-cognitive-improvement-after-cognitive-remediation-with-social-functioning-in-patients-with-schizophrenia-and-severe-cognitive-deficits
#18
J P Lindenmayer, Samantha Fregenti, Guoxin Kang, Veronica Ozog, Isidora Ljuri, Anzalee Khan, A Goldring, Susan R McGurk
BACKGROUND: This study aims to examine the effects of change in neurocognition on functional outcomes and to examine predictors of change in social functions following a 12-week course of cognitive remediation in patients with schizophrenia and schizoaffective disorder with severe cognitive impairments. METHOD: Level of social functioning was assessed using a performance based measure of functional capacity (PSP) in patients prior to and after the completion of 12-week cognitive remediation treatment (CRT)...
January 13, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28094169/a-12-week-randomized-controlled-trial-of-twice-daily-intranasal-oxytocin-for-social-cognitive-deficits-in-people-with-schizophrenia
#19
L Fredrik Jarskog, Cort A Pedersen, Jacqueline L Johnson, Robert M Hamer, Shane W Rau, Tonya Elliott, David L Penn
Social cognition is impaired in people with schizophrenia and these deficits are strongly correlated with social functioning. Oxytocin is a hypothalamic peptide that contributes to maternal infant bonding and has diverse pro-social effects in adults. This study tested the hypothesis that 12weeks of intranasal oxytocin will improve social cognitive function in outpatients with schizophrenia and schizoaffective disorder. Sixty-eight eligible participants were randomized to oxytocin (24IU twice daily) or placebo...
January 13, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28093278/similar-patterns-of-brain-activation-abnormalities-during-emotional-and-non-emotional-judgments-of-faces-in-a-schizophrenia-family-study
#20
Michael J Spilka, Vina M Goghari
Schizophrenia patients have impaired performance and abnormal brain activation during facial emotion recognition, which may represent a marker of genetic liability to schizophrenia. However, it remains unclear whether the impairment is specific to recognizing emotion from faces or is instead attributable to more generalized dysfunction. The current study aimed to distinguish between specific and generalized neural dysfunction underlying impaired facial emotion recognition in schizophrenia and examine associations with genetic liability...
January 13, 2017: Neuropsychologia
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