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Cognitive impairment associated with schizophrenia

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https://www.readbyqxmd.com/read/28334240/the-use-of-rbans-among-inpatient-forensic-monolingual-spanish-speakers
#1
Cynthia Aguilar, Kenny A Karyadi, Dominique I Kinney, Stephen R Nitch
Objective: The Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) has been shown to be an effective screener for detecting neurocognitive impairments in English speaking forensic psychiatric inpatients, but no studies have examined whether the RBANS would have the same utility among monolingual Spanish speaking inpatients. This study sought to examine RBANS performance, as well as risk factors (i.e., educational, neurological, and medical) influencing RBANS performance, in that particular population...
February 18, 2017: Archives of Clinical Neuropsychology: the Official Journal of the National Academy of Neuropsychologists
https://www.readbyqxmd.com/read/28323201/the-recency-ratio-is-associated-with-reduced-csf-glutamate-in-late-life-depression
#2
Davide Bruno, Jay Nierenberg, Thomas B Cooper, Charles R Marmar, Henrik Zetterberg, Kaj Blennow, Kenji Hashimoto, Nunzio Pomara
Glutamate is the principal excitatory neurotransmitter in the central nervous system, and is thought to be involved in the process of memory encoding and storage. Glutamate disturbances have also been reported in psychiatric disorders, such as schizophrenia and major depressive disorder (MDD), and in Alzheimer's disease. In this paper, we set out to study the relationship between cerebrospinal fluid (CSF) glutamate levels and memory performance, which we believe has not been reported previously. In particular, we focused on recall performance broken down by serial position...
March 16, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28320371/possible-factors-influencing-the-duration-of-hospital-stay-in-patients-with-psychiatric-disorders-attempting-suicide-by-jumping
#3
Tsubasa Omi, Hiroshi Ito, Keisen Riku, Koji Kanai, Hiromune Takada, Satoshi Fujimi, Hidenori Matsunaga, Kazutaka Ohi
BACKGROUND: Patients with psychiatric disorders have a high rate of suicide. The present study investigated factors influencing hospital stays for Japanese patients with psychiatric disorders attempting suicide by jumping. METHODS: We diagnosed all suicide attempts (n = 113) by jumping based on the International Classification of Diseases 10th Revision (ICD-10) and investigated the mean hospital stays of patients with each diagnosis based on the ICD-10 code. We then analyzed differences in the demographic and clinical characteristics between the diagnostic groups to identify factors influencing the duration of hospital stay...
March 20, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28318840/self-reported-sleep-disturbances-associated-with-procedural-learning-impairment-in-adolescents-at-ultra-high-risk-for-psychosis
#4
Jessica R Lunsford-Avery, Derek J Dean, Vijay A Mittal
Sleep disturbance contributes to impaired procedural learning in schizophrenia, yet little is known about this relationship prior to psychosis onset. Adolescents at ultra high-risk (UHR; N=62) for psychosis completed the Pittsburgh Sleep Quality Index (PSQI) and a procedural learning task (Pursuit Rotor). Increased self-reported problems with sleep latency, efficiency, and quality were associated with impaired procedural learning rate. Further, within-sample comparisons revealed that UHR youth reporting better sleep displayed a steeper learning curve than those with poorer sleep...
March 16, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28316115/gabaa-and-gabab-receptor-dysregulation-in-superior-frontal-cortex-of-subjects-with-schizophrenia-and-bipolar-disorder
#5
S Hossein Fatemi, Timothy D Folsom, Paul D Thuras
Schizophrenia and bipolar disorder are complex psychiatric disorders that affect millions of people worldwide. Evidence from gene association and postmortem studies has identified abnormalities of the gamma-aminobutyric acid (GABA) signaling system in both disorders. Abnormal GABAergic signaling and transmission could contribute to the symptomatology of these disorders, potentially through impaired gamma oscillations which normally occur during cognitive processing. In the current study, we examined the protein expression of 14 GABAA and two GABAB receptor subunits in the superior frontal cortex of subjects with schizophrenia, bipolar disorder, and healthy controls...
March 18, 2017: Synapse
https://www.readbyqxmd.com/read/28302394/the-relationship-between-level-of-cognitive-impairments-and-functional-outcome-trajectories-in-first-episode-schizophrenia
#6
Susie Fu, Nikolai Czajkowski, Bjørn Rishovd Rund, Anne-Kari Torgalsbøen
Although cognitive impairments are consistently linked to functional outcome in chronic schizophrenia, the relationship remains unclear for patients with first-episode schizophrenia. The objective of this present study was to determine whether there are distinct developmental trajectories for functional outcome in patients with different levels of baseline cognition. The present study has a multi-follow-up design, and includes data from six follow-ups over four years. Assessments were conducted yearly, apart from the first year where assessments were conducted every six months...
March 14, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28302393/relationship-between-insight-and-theory-of-mind-in-schizophrenia-a-meta-analysis
#7
REVIEW
Emre Bora
Poor insight in schizophrenia has been associated with executive dysfunction and deficits in general cognitive ability. The overall outcome of available neurocognitive studies suggests that there is a significant but modest relationship between cognitive deficits and poor insight in schizophrenia. However, social cognitive abilities, particularly, theory of mind (ToM), might also play a role in poor insight in schizophrenia. A novel meta-analysis of the relationship between ToM and insight in schizophrenia was conducted...
March 14, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28301828/steeper-discounting-of-delayed-rewards-in-schizophrenia-but-not-first-degree-relatives
#8
Linda Q Yu, Sangil Lee, Natalie Katchmar, Theodore D Satterthwaite, Joseph W Kable, Daniel H Wolf
Excessive discounting of future rewards has been related to a variety of risky behaviors and adverse clinical conditions. Prior work examining delay discounting in schizophrenia suggests an elevated discount rate. However, it remains uncertain whether this reflects the disease process itself or an underlying genetic vulnerability, whether it is selective for delay discounting or reflects pervasive changes in decision-making, and whether it is driven by specific clinical dimensions such as cognitive impairment...
March 7, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28297593/clinical-effectiveness-and-cognitive-impact-of-electroconvulsive-therapy-for-schizophrenia-a-large-retrospective-study
#9
Tyler S Kaster, Zafiris J Daskalakis, Daniel M Blumberger
OBJECTIVE: To determine the clinical effectiveness and cognitive impact of electroconvulsive therapy (ECT) in a large clinical sample of patients with schizophrenia and explore factors associated with treatment response and transient cognitive impairment. METHODS: We examined the clinical records of 144 patients with a DSM-IV diagnosis of schizophrenia or schizoaffective disorder who were treated at an academic mental health hospital from October 2009 to August 2014...
March 14, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/28297590/insight-into-illness-and-cognition-in-schizophrenia-in-earlier-and-later-life
#10
Philip Gerretsen, Aristotle N Voineskos, Ariel Graff-Guerrero, Mahesh Menon, Bruce G Pollock, David C Mamo, Benoit H Mulsant, Tarek K Rajji
OBJECTIVE: Impaired insight into illness in schizophrenia is associated with illness severity and deficits in premorbid intellectual function, executive function, and memory. A previous study of patients aged 60 years and older found that illness severity and premorbid intellectual function accounted for variance in insight impairment. As such, we aimed to test whether similar relationships would be observed in earlier life. METHODS: A retrospective analysis was performed on 1 large sample of participants (n = 171) with a DSM-IV-TR diagnosis of schizophrenia aged 19 to 79 years acquired from 2 studies: (1) a psychosocial intervention trial for older persons with schizophrenia (June 2008 to May 2014) and (2) a diffusion tensor imaging and genetics study of psychosis across the life span (February 2007 to December 2013)...
March 14, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/28293729/altered-cortico-striatal-crosstalk-underlies-object-recognition-memory-deficits-in-the-sub-chronic-phencyclidine-model-of-schizophrenia
#11
Aman Asif-Malik, Daniel Dautan, Andrew M J Young, Todor V Gerdjikov
The neural mechanisms underlying cognitive deficits in schizophrenia are poorly understood. Sub-chronic treatment with the NMDA antagonist phencyclidine (PCP) produces cognitive abnormalities in rodents that reliably model aspects of the neurocognitive alterations observed in schizophrenia. Given that network activity across regions encompassing medial prefrontal cortex (mPFC) and nucleus accumbens (NAc) plays a significant role in motivational and cognitive tasks, we measured activity across cortico-striatal pathways in PCP-treated rats to characterize neural enabling and encoding of task performance in a novel object recognition task...
March 14, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28293046/efficacy-of-risperidone-augmentation-with-ondansetron-in-the-treatment-of-negative-and-depressive-symptoms-in-schizophrenia-a-randomized-clinical-trial
#12
Roya Samadi, Susan Soluti, Reza Daneshmand, Shervin Assari, Ali Akhoundpour Manteghi
BACKGROUND: Given the potential role of the 5-hydroxytryptamine-3 receptor in the pathogenesis of schizophrenia, this study was performed to determine whether ondansetron plus risperidone could reduce the negative and depressive symptoms in patients with treatment-resistant schizophrenia. METHODS: In a double-blinded, placebo-controlled, randomized trial (IRCT registration # 201112125280N7), in 2012-2013 in Mashhad, Iran, 38 patients with treatment-resistant schizophrenia received risperidone either combined with a fixed dose (4-8 mg/d) of ondansetron (n=18) or with a placebo (n=20) for 12 weeks...
January 2017: Iranian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28291970/neurodevelopmental-versus-neurodegenerative-model-of-schizophrenia-and-bipolar-disorder-comparison-with-physiological-brain-development-and-aging
#13
Massimiliano Buoli, Marta Serati, Alice Caldiroli, Laura Cremaschi, Alfredo Carlo Altamura
Available data support a contribution of both neurodevelopmental and neurodegenerative factors in the etiology of schizophrenia (SCH) and bipolar disorder (BD). Of note, one of the most important issue of the current psychiatric research is to identify the specific factors that contribute to impaired brain development and neurodegeneration in SCH and BD, and especially how these factors alter normal brain development and physiological aging process. Our hypothesis is that only specific damages, taking place in precise brain development stages, are associated with future SCH /BD onset and that neurodegeneration consists of an acceleration of brain aging after SCH /BD onset...
March 2017: Psychiatria Danubina
https://www.readbyqxmd.com/read/28288547/neuropsychological-correlates-of-schizotypy-a-systematic-review-and-meta-analysis-of-cross-sectional-studies
#14
Sara Siddi, Donatella Rita Petretto, Antonio Preti
INTRODUCTION: Cognitive deficits can precede the onset of psychotic episodes and predict the onset of the illness in individuals with schizotypy traits. In some studies, high levels of schizotypy were associated with impairments in memory, attention, executive functions, and verbal fluency. This review provides a more comprehensive understanding of cognitive impairments related to schizoytpy. METHODS:  A systematic review of "schizotypy and neuropsychological measures" was conducted, and it retrieved 67 studies...
March 13, 2017: Cognitive Neuropsychiatry
https://www.readbyqxmd.com/read/28285029/biological-motion-processing-in-schizophrenia-systematic-review-and-meta-analysis
#15
Łukasz Okruszek, Izabela Pilecka
CONTEXT: Patients with schizophrenia show impairments in processing of biological motion. This is especially important since deficits in domains of social cognition has been associated with functional outcome and everyday functioning in this population. OBJECTIVES: We conducted a systematic review and meta-analysis of studies which have used point-light displays to present whole-body motion to patients with schizophrenia and healthy controls, to evaluate the magnitude of differences between these groups in biological motion processing...
March 9, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28285028/social-cognition-of-patients-with-schizophrenia-across-the-phases-of-illness-a-longitudinal-study
#16
Vijaya Lakshmi Valaparla, Ritu Nehra, Urvakhsh Meherwan Mehta, Jagadisha Thirthalli, Sandeep Grover
AIM: This longitudinal study aimed to evaluate social cognition of patients with schizophrenia at two points, i.e., during the symptomatic phase and clinical remission phase. Additional aim was to evaluate the relationship of social cognition with psychopathology and functional outcome. METHODOLOGY: Fifty-one patients (N=51) were evaluated on Social Cognition Rating Tools in Indian Setting (SOCRATIS), Positive and Negative Syndrome Scale (PANSS), Global Assessment of Functioning (GAF), Socio-occupational functioning scale (SOFS) and Indian Disability Evaluation and Assessment Scale (IDEAS) during the symptomatic phase of illness...
March 8, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28283559/a-rare-variant-identified-within-the-glun2b-c-terminus-in-a-patient-with-autism-affects-nmda-receptor-surface-expression-and-spine-density
#17
Shuxi Liu, Liang Zhou, Hongjie Yuan, Marta Vieira, Antonio Sanz-Clemente, John D Badger, Wei Lu, Stephen F Traynelis, Katherine W Roche
NMDA receptors (NMDARs) are ionotropic glutamate receptors that are crucial for neuronal development and higher cognitive processes. NMDAR dysfunction is involved in a variety of neurological and psychiatric diseases; however, the mechanistic link between the human pathology and NMDAR dysfunction is poorly understood. Rare missense variants within NMDAR subunits have been identified in numerous patients with mental or neurological disorders. We specifically focused on the GluN2B NMDAR subunit, which is highly expressed in the hippocampus and cortex throughout development...
March 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28277736/evidence-of-systematic-attenuation-in-the-measurement-of-cognitive-deficits-in-schizophrenia
#18
Michael L Thomas, Virginie M Patt, Andrew Bismark, Joyce Sprock, Melissa Tarasenko, Gregory A Light, Gregory G Brown
Cognitive tasks that are too hard or too easy produce imprecise measurements of ability, which, in turn, attenuates group differences and can lead to inaccurate conclusions in clinical research. We aimed to illustrate this problem using a popular experimental measure of working memory-the N-back task-and to suggest corrective strategies for measuring working memory and other cognitive deficits in schizophrenia. Samples of undergraduates (n = 42), community controls (n = 25), outpatients with schizophrenia (n = 33), and inpatients with schizophrenia (n = 17) completed the N-back...
March 9, 2017: Journal of Abnormal Psychology
https://www.readbyqxmd.com/read/28273278/catechol-o-methyltransferase-comt-polymorphisms-modulate-working-memory-in-individuals-with-schizophrenia-and-healthy-controls
#19
Camila T Matsuzaka, Denise Christofolini, Vanessa K Ota, Ary Gadelha, Arthur A Berberian, Cristiano Noto, Diego R Mazzotti, Leticia M Spindola, Patricia N Moretti, Marilia A C Smith, Maria I Melaragno, Sintia I Belangero, Rodrigo A Bressan
Objective: Cognitive impairment is a core feature of schizophrenia, related to dopaminergic dysfunction in the prefrontal cortex (PFC). It is hypothesized that functional single nucleotide polymorphism (SNP) rs4680 of the catechol-O-methyltransferase (COMT) gene could mediate the relationship between cognition and dopamine activity in the PFC. Other COMT SNPs could also play a role. Methods: We evaluated the role of three COMT SNPs (rs737865, rs165599, and rs4680) in schizophrenia and their impact on three working memory tasks...
March 2, 2017: Revista Brasileira de Psiquiatria
https://www.readbyqxmd.com/read/28261797/the-pro-cognitive-mechanisms-of-physical-exercise-in-people-with-schizophrenia
#20
REVIEW
Joseph Firth, Jack Cotter, Rebekah Carney, Alison R Yung
Schizophrenia is associated with pervasive cognitive deficits which are unresponsive to antipsychotic medications. Physical exercise has been shown to improve cognitive functioning in people with schizophrenia, although the mechanisms for this are unclear. We conducted a systematic review of all exercise intervention studies which reported changes in either brain structure, connectivity or peripheral biomarkers which could underlie cognitive improvements from exercise in schizophrenia. An electronic database search was conducted on 22(nd) September 2016 using keywords relevant to exercise and neurocognition in schizophrenia...
March 5, 2017: British Journal of Pharmacology
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