Abstract：
BACKGROUND:Although altered gamma-aminobutyric acid (GABA) neurotransmission has been implicated in the pathophysiology of schizophrenia, it is unclear whether the influence of GABA on working memory processes is confounded by nicotine use in this population. It is therefore crucial to evaluate working memory and its underlying mechanisms in non-smokers with schizophrenia to eliminate the confounding effects of nicotine on behavior and neurophysiology. METHODS:In this cross-sectional study, working memory was assessed using the verbal N-back task, while GABAergic function was assessed through motor cortical inhibition using single and paired-pulse transcranial magnetic stimulation (TMS) to the left primary motor cortex in 11 non-smokers with schizophrenia and 13 non-smoker healthy subjects. RESULTS:Similar to previously published studies, working memory performance was significantly impaired in the 3-back condition in patients with schizophrenia compared to healthy subjects (p=0.036). In addition, GABAA receptor function was significantly reduced in schizophrenia as assessed by short interval cortical inhibition (SICI) (p=0.005). A positive correlation was found between GABAA inhibition and working memory performance on the 3-back task (r(23)=0.55, p=0.006), suggesting that greater GABAA inhibition is associated with better performance on tasks of working memory. CONCLUSIONS:Our findings highlight the role of GABAA receptor dysfunction in working memory and the pathophysiology of schizophrenia, and may represent a selective characteristic of schizophrenia. Moreover, these findings suggest a potential therapeutic role for targeting GABA receptor activity to improve cognition and quality of life in patients with schizophrenia.
journal_name
Schizophr Resjournal_title
Schizophrenia researchauthors
Bridgman AC,Barr MS,Goodman MS,Chen R,Rajji TK,Daskalakis ZJ,George TPdoi
10.1016/j.schres.2016.01.008subject
Has Abstractpub_date
2016-03-01 00:00:00pages
125-30issue
1-3eissn
0920-9964issn
1573-2509pii
S0920-9964(16)30008-1journal_volume
171pub_type
杂志文章abstract：BACKGROUND:Altered motor behavior has consistently been reported in medication-naive adult patients with schizophrenia and first episode psychosis and adults at clinical high risk for psychosis (CHR). This study is the first to evaluate the prevalence of abnormal involuntary movements in a community sample of children ...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2016.04.032
更新日期：2016-07-01 00:00:00
abstract：:Using the fluorescent probe DPH (1,6-diphenyl-1,3,5-hexatriene), steady-state anisotropy (rs) values were determined in red blood cell (RBC) ghost membranes of schizophrenic patients before (n = 26) and after (n = 16) haloperidol withdrawal, and age- and sex-matched normal controls (n = 22). Patients on haloperidol we...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/0920-9964(94)90014-0
更新日期：1994-02-01 00:00:00
abstract：:Research into the neurobiological processes that may lead to the onset of schizophrenia places growing emphasis on the glutamatergic system and brain development. Preclinical studies have shown that neurodevelopmental, genetic, and environmental factors contribute to glutamatergic dysfunction and schizophrenia-related...
journal_title：Schizophrenia research
pub_type： 杂志文章,评审
doi：10.1016/j.schres.2020.09.013
更新日期：2020-09-01 00:00:00
abstract：BACKGROUND:The number of antipsychotic prescriptions dispensed annually in England has increased substantially over the past decade. It is not known whether this is due to changes in prescribing practices, or an increase in the prevalence of psychosis. To our knowledge, no previous studies have investigated temporal tr...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2020.11.057
更新日期：2021-01-09 00:00:00
abstract：:Patients with schizophrenia demonstrate a variety of attentional impairments which have proven difficult to relate to specific neural systems. Posner et al. (1988) reported an asymmetric slowing of right visual field orienting in schizophrenia similar to that observed in patients with parietal lesions. We examined the...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/0920-9964(92)90013-u
更新日期：1992-09-01 00:00:00
abstract：:Motor abnormalities (MAs) may be already evidenced long before the beginning of illness and are highly prevalent in psychosis. However, the extent to which the whole range of MAs are related to cognitive impairment in psychosis remains understudied. This study aimed to examine comparatively the relationships between t...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2017.10.035
更新日期：2018-10-01 00:00:00
abstract：:The involvement of the gamma-aminobutyric acid (GABA) system in schizophrenia is suggested by postmortem studies and the common use of GABA receptor-potentiating agents in treatment. In a recent study, we used a benzodiazepine challenge to demonstrate abnormal GABAergic function during processing of negative visual st...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2015.08.022
更新日期：2015-10-01 00:00:00
abstract：BACKGROUND:A small but significant association between schizophrenia and violence is open to a number of explanations. Impaired empathy has been associated with schizophrenia, and with violence in the general population. Our aim was to conduct a systematic review of any research into relationships between schizophrenia...
journal_title：Schizophrenia research
pub_type： 杂志文章,评审
doi：10.1016/j.schres.2012.07.019
更新日期：2012-10-01 00:00:00
abstract：BACKGROUND:cortical gray matter volume deficit and ventricular enlargement are well documented in schizophrenia, but their presence in bipolar disorder is less well established. METHODS:global cortical gray matter, white matter and sulcal CSF, as well as lateral and third ventricular volume measures, were derived from...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/s0920-9964(99)00063-8
更新日期：1999-12-21 00:00:00
abstract：:Transient working memory requires attention and temporary storage of information, whereas executive function working memory requires additional mental manipulation of that information. Working memory impairment is common in schizophrenia patients, but only some studies have found differential impairment in executive f...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2006.04.013
更新日期：2006-10-01 00:00:00
abstract：:Recent studies of cerebral pathology in patients with schizophrenia have focused on symptomatological and electrophysiological correlates of reduced temporal lobe structure volumes. Volume deficits of the left superior temporal gyrus have been correlated with auditory hallucinations as well as to left-sided P300 ampli...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/s0920-9964(99)00006-7
更新日期：1999-08-17 00:00:00
abstract：:EEGs were recorded from 32 channels in 30 normal males, ages 16-22. Delta activity decreased throughout this age range. This decrease was greatest in the left frontal and temporal regions; no occipital lead showed this pattern. Relative EEG amplitude analysis, based on normalized maps, revealed decreases with age acro...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/0920-9964(92)90039-8
更新日期：1992-07-01 00:00:00
abstract：BACKGROUND:The study aimed to assess the construct validity, internal consistency and factor structure of the Specific Levels of Functioning Scale (SLOF), a multidimensional instrument assessing real life functioning. METHODS:The study was carried out in 895 Italian people with schizophrenia, all living in the communi...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2014.07.044
更新日期：2014-10-01 00:00:00
abstract：:There is strong evidence that hippocampal 5-hydroxytryptamine (5-HT) systems are affected in schizophrenia and hence we have studied a number of markers of the 5-HT system in hippocampi from subjects with schizophrenia. Using in situ radioligand binding with autoradiography we measured [(3)H]proplyamino-8-hydroxy-1,2,...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2004.02.007
更新日期：2004-12-01 00:00:00
abstract：OBJECTIVE:The Recovery Assessment Scale (RAS) is one of the most widely used measurements of recovery in mental health research. To date, no data have been available concerning the psychometric characteristics of the RAS in homeless people with severe mental illness. The aim of this study was to provide new data regard...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2015.10.007
更新日期：2015-12-01 00:00:00
abstract：:Numerous genetic and postmortem studies link N-methyl-d-aspartate receptor (NMDAR) dysfunction with schizophrenia, forming the basis of the popular glutamate hypothesis. Neuronal NMDAR abnormalities are consistently reported from both basic and clinical experiments, however, non-neuronal cells also contain NMDARs, and...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2020.10.004
更新日期：2020-11-11 00:00:00
abstract：OBJECTIVES:The impact of cannabis use on the brain tissue is still unclear, both in the healthy developing brain and in people with schizophrenia. The focus of this review is on white matter, the primary connective infrastructure of the brain. METHODS:We systematically reviewed diffusion tensor imaging (DTI) studies o...
journal_title：Schizophrenia research
pub_type： 杂志文章,评审
doi：10.1016/j.schres.2014.04.026
更新日期：2014-07-01 00:00:00
abstract：:Nondeclarative memory (NDM) has subtypes associated with different brain regions; learning of a probabilistic classification task is impaired by striatal damage and learning of a gambling task is impaired by ventromedial prefrontocortical damage. Typical and atypical antipsychotic medications differentially affect imm...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/s0920-9964(02)00315-8
更新日期：2003-06-01 00:00:00
abstract：:Because previous studies have shown deficits in olfactory identification for male patients with schizophrenia, either withdrawn from or receiving neuroleptic medication, the purpose of the current study was to determine if such deficits occurred in male patients who had never received neuroleptics. A sample of male (n...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/0920-9964(93)90022-b
更新日期：1993-01-01 00:00:00
abstract：:We investigated the relationship between the P300, neuropsychological test performance and symptomatology in recent-onset schizophrenic patients (n = 45) to gain insight into underlying mechanisms of abnormal P300 in schizophrenia. The P300 was recorded in two sessions with an intermission of five minutes, at the midl...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/s0920-9964(01)00184-0
更新日期：2002-05-01 00:00:00
abstract：:Adolescents meeting diagnostic criteria for schizotypal personality disorder (SPD) are presumed to be at risk for developing schizophrenia in adulthood, making them an important group for exploring the developmental trajectory of the disease. Deficits in executive functioning have been documented in schizophrenia pati...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/s0920-9964(99)00119-x
更新日期：2000-04-07 00:00:00
abstract：:Abnormality of P300 waveforms of event-related potentials (ERPs) has been suggested to represent an aspect of the pathophysiology of schizophrenia. Previous work points to the contribution of altered neural function in discrete brain regions in the left hemisphere to psychotic symptoms and cognitive deficits of schizo...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2008.01.020
更新日期：2008-04-01 00:00:00
abstract：:Omega-3 treatment studies for multi-episode schizophrenia or clinical high risk for conversion to psychosis states have had variable, and often negative, results. To examine adjunctive omega-3 treatment for recent onset psychosis, participants aged 15-40 years with recent onset schizophrenia-spectrum (n = 46) or bipol...
journal_title：Schizophrenia research
pub_type： 杂志文章,随机对照试验
doi：10.1016/j.schres.2018.09.006
更新日期：2019-02-01 00:00:00
abstract：BACKGROUND:Findings from the WHO sponsored multicenter studies done a few decades ago, which reported favorable outcome of schizophrenia in developing countries both in 2 and 5 year follow-up studies, dominated the world view until recently. Emerging evidence from Low and Middle Income countries (LAMIC) started to chal...
journal_title：Schizophrenia research
pub_type： 杂志文章,多中心研究
doi：10.1016/j.schres.2011.10.021
更新日期：2012-04-01 00:00:00
abstract：:Characterizing a pattern of cognitive dysfunction in early onset schizophrenic patients may illuminate neurodevelopmental contributions to the illness. A cohort of chronically institutionalized schizophrenic patients with a variable range of age of onset (range 7-29 years) was administered a comprehensive battery of n...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/0920-9964(95)00065-8
更新日期：1996-05-01 00:00:00
abstract：INTRODUCTION:Progressive atrophy occurs in brain regions involved in the working memory network along the schizophrenia's course, but without parallel evolution of working memory impairment. We investigated the functional organization inside this network at different stages of the disease. METHODS:Twenty-eight patient...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2013.10.023
更新日期：2013-12-01 00:00:00
abstract：:Schizophrenia has generally been viewed as having a unique preschizophrenia personality or destructive to the personality post-onset. This view is reflected in the scarcity of studies of personality in schizophrenia with the exception of schizotypal personality considered by many as an endophenotype of schizophrenia. ...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2017.02.015
更新日期：2017-11-01 00:00:00
abstract：:Social perception and mentalizing are fundamental social cognitive abilities that are related to functioning and are impaired in schizophrenia. A novel approach to examine the relationship between social cognition and community functioning is to first functionally categorize individuals with schizophrenia and then eva...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2016.01.029
更新日期：2016-03-01 00:00:00
abstract：OBJECTIVE:The diagnosis of psychotic disorder is associated with a risk of violence. Psychotic-like experiences (PLEs) in the general population may share an etiological background with psychotic disorders. The present study has evaluated the association between PLEs and violent behavior in adolescents. METHODS:PLEs a...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2010.08.028
更新日期：2011-03-01 00:00:00
abstract：BACKGROUND:Recent research has identified impairment in processing speed, measured by the digit-symbol substitution task, as central to the cognitive deficit in schizophrenia. However, the underlying cognitive correlates of this impairment remain unknown. METHODS:A sample of cases (N=125) meeting DSM-IV criteria for s...
journal_title：Schizophrenia research
pub_type： 杂志文章
doi：10.1016/j.schres.2012.08.020
更新日期：2012-12-01 00:00:00
