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Yasa Kostas R, Kostas K, MacPherson SE, Wolters MK. Semantic verbal fluency in native speakers of Turkish: a systematic review of category use, scoring metrics and normative data in healthy individuals. J Clin Exp Neuropsychol 2024; 46:272-301. [PMID: 38904178 DOI: 10.1080/13803395.2024.2331827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 03/07/2024] [Indexed: 06/22/2024]
Abstract
INTRODUCTION Semantic verbal fluency (SVF) is a widely used measure of frontal executive function and access to semantic memory. SVF scoring metrics include the number of unique words generated, perseverations, intrusions, semantic cluster size and switching between clusters, and scores vary depending on the language the test is administered in. In this paper, we review the existing normative data for Turkish, the main metrics used for scoring SVF data in Turkish, and the most frequently used categories. METHOD We conducted a systematic review of peer-reviewed papers using Medline, EMBASE, PsycInfo, Web of Science, and two Turkish databases, TR-Dizin and Yok-Tez. Included papers contained data on the SVF performance of healthy adult native speakers of Turkish, and reported the categories used. Versions of the SVF that required participants to alternate categories were excluded. We extracted and tabulated demographics, descriptions of groups, metrics used, categories used, and sources of normative data. Studies were assessed for level of detail in reporting findings. RESULTS 1400 studies were retrieved. After deduplication, abstract, full text screening, and merging of theses with their published versions, 121 studies were included. 114 studies used the semantic category "animal", followed by first names (N = 14, 12%). All studies reported word count. More complex measures were rare (perseverations: N = 12, 10%, clustering and switching: N = 5, 4%). Four of seven normative studies reported only word count, two also measured perseverations, and one reported category violations and perseverations. Two normative studies were published in English. CONCLUSIONS There is a lack of normative Turkish SVF data with more complex metrics, such as clustering and switching, and a lack of normative data published in English. Given the size of the Turkish diaspora, normative SVF data should include monolingual and bilingual speakers. Limitations include a restriction to key English and Turkish databases.
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Affiliation(s)
| | - Kahraman Kostas
- Department of Computer Science, Heriot-Watt University, Edinburgh, UK
| | - Sarah E MacPherson
- Human Cognitive Neuroscience, Department of Psychology, University of Edinburgh, Edinburgh, UK
| | - Maria K Wolters
- School of Informatics, University of Edinburgh, Edinburgh, UK
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Marin L, Guàrdia A, González-Rodríguez A, Haba-Rubio J, Natividad M, Bosch E, Domínguez N, Monreal JA. Sleep Disturbances in At-Risk Mental States and First Episode of Psychosis: A Narrative Review on Interventions. Clocks Sleep 2023; 5:249-259. [PMID: 37218866 DOI: 10.3390/clockssleep5020020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 02/17/2023] [Accepted: 04/19/2023] [Indexed: 05/24/2023] Open
Abstract
Sleep disturbances are a common yet often overlooked symptom of psychosis that can drastically affect the quality of life and well-being of those living with the condition. Sleep disorders are common in people diagnosed with schizophrenia and have significant negative effects on the clinical course of the illness and the functional outcomes and quality of life of patients. There is a limited number of studies addressing this question in first-episode psychosis (FEP). In this narrative review, we aimed to provide an overview of sleep disorders in populations with FEP and at-risk mental states (ARMS). The review was focused on the various treatments currently used for sleep disorders, including both non-pharmacological and pharmacological treatments. A total of 48 studies were included. We found that sleep disturbances are associated with attenuated psychotic symptoms and other psychopathological symptoms in ARMSs. The association of sleep disturbances with the transition to psychosis has been poorly investigated. Sleep disturbances have an impact on the quality of life and the psychopathological symptoms of people suffering from FEP. The non-pharmacological treatments include cognitive behavioral therapy for insomnia, bright light therapy, cognitive restructuring techniques, sleep restriction therapy, basic sleep hygiene education, and the provision of portable sleep trackers. Other treatments include antipsychotics in acute phases and melatonin. The early intervention in sleep disturbances may improve overall prognosis in emerging psychosis populations.
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Affiliation(s)
- Lorena Marin
- Department of Mental Health, Mútua Terrassa University Hospital, Fundació Docència I Recerca Mutua Terrassa, 08221 Terrassa, Spain
| | - Armand Guàrdia
- Department of Mental Health, Mútua Terrassa University Hospital, Fundació Docència I Recerca Mutua Terrassa, 08221 Terrassa, Spain
| | - Alexandre González-Rodríguez
- Department of Mental Health, Mútua Terrassa University Hospital, Fundació Docència I Recerca Mutua Terrassa, 08221 Terrassa, Spain
| | - José Haba-Rubio
- Centre for Investigation and Research in Sleep (CIRS), Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland
| | - Mentxu Natividad
- Department of Mental Health, Mútua Terrassa University Hospital, Fundació Docència I Recerca Mutua Terrassa, 08221 Terrassa, Spain
| | - Elena Bosch
- Department of Mental Health, Mútua Terrassa University Hospital, Fundació Docència I Recerca Mutua Terrassa, 08221 Terrassa, Spain
| | - Noelia Domínguez
- Department of Mental Health, Mútua Terrassa University Hospital, Fundació Docència I Recerca Mutua Terrassa, 08221 Terrassa, Spain
| | - José Antonio Monreal
- Department of Mental Health, Mútua Terrassa University Hospital, Fundació Docència I Recerca Mutua Terrassa, 08221 Terrassa, Spain
- Institut de Neurociències, UAB, CIBERSAM, 08221 Terrassa, Spain
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Mayeli A, Wilson JD, Donati FL, LaGoy AD, Ferrarelli F. Sleep spindle alterations relate to working memory deficits in individuals at clinical high-risk for psychosis. Sleep 2022; 45:zsac193. [PMID: 35981865 PMCID: PMC9644126 DOI: 10.1093/sleep/zsac193] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 07/10/2022] [Indexed: 08/12/2023] Open
Abstract
STUDY OBJECTIVES Sleep spindles are waxing and waning EEG waves exemplifying the main fast oscillatory activity occurring during NREM sleep. Several recent studies have established that sleep spindle abnormalities are present in schizophrenia spectrum disorders, including in early-course and first-episode patients, and those spindle deficits are associated with some of the cognitive impairments commonly observed in these patients. Cognitive deficits are often observed before the onset of psychosis and seem to predict poor functional outcomes in individuals at clinical high-risk for psychosis (CHR). Yet, the presence of spindle abnormalities and their relationship with cognitive dysfunction has not been investigated in CHR. METHODS In this study, overnight high-density (hd)-EEG recordings were collected in 24 CHR and 24 healthy control (HC) subjects. Spindle density, duration, amplitude, and frequency were computed and compared between CHR and HC. Furthermore, WM was assessed for both HC and CHR, and its relationship with spindle parameters was examined. RESULTS CHR had reduced spindle duration in centro-parietal and prefrontal regions, with the largest decrease in the right prefrontal area. Moderation analysis showed that the relation between spindle duration and spindle frequency was altered in CHR relative to HC. Furthermore, CHR had reduced WM performance compared to HC, which was predicted by spindle frequency, whereas in HC spindle frequency, duration, and density all predicted working memory performance. CONCLUSION Altogether, these findings indicate that sleep spindles are altered in CHR individuals, and spindle alterations are associated with their cognitive deficits, thus representing a sleep-specific putative neurophysiological biomarker of cognitive dysfunction in psychosis risk.
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Affiliation(s)
- Ahmad Mayeli
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
| | - James D Wilson
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Alice D LaGoy
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Fabio Ferrarelli
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
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Dondé C, Jaffiol A, Khouri C, Pouchon A, Tamisier R, Lejoyeux M, d'Ortho MP, Polosan M, Geoffroy PA. Sleep disturbances in early clinical stages of psychotic and bipolar disorders: A meta-analysis. Aust N Z J Psychiatry 2022; 56:1068-1079. [PMID: 34971518 DOI: 10.1177/00048674211068395] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To provide a qualitative view and quantitative measure of sleep disturbances across and between early stages - clinical ultra high-risk and first episode - of psychotic and bipolar disorders. METHODS Electronic databases (PubMed, Cochrane, Embase, PsychINFO) were searched up to March 2021 for studies comparing sleep measures between individuals with an early stage and controls. Standard mean deviations (Cohen's d effect sizes) were calculated for all comparisons and pooled with random-effects models. Chi-square tests were used for direct between-subgroups (ultra high-risk vs first episode) comparisons of standard mean deviations. The effects of age, sex ratio, symptoms and treatment were examined in meta-regression analyses. RESULTS A database search identified 13 studies that contrasted sleep measures between individuals with an early stage (N = 537) and controls (N = 360). We observed poorer subjective sleep quality (standard mean deviation = 1.32; 95% confidence interval, [1.01, 1.62]), shorter total sleep time (standard mean deviation =-0.44; 95% confidence interval, [-0.67, -0.21]), lower sleep efficiency (standard mean deviation = -0.72; 95% confidence interval, [-1.08, -0.36]), longer sleep onset latency (standard mean deviation = 0.75; 95% confidence interval, [0.45, 1.06]) and longer duration of wake after sleep onset (standard mean deviation = 0.49; 95% confidence interval, [0.21, 0.77]) were observed in early stages compared to controls. No significant differences were observed for any of the reported electroencephalographic parameters of sleep architecture. No significant between-subgroups differences were observed. Meta-regressions revealed a significant effect of the age and the antipsychotic status on subjective measures of sleep. CONCLUSION The early stage population presents with significant impairments of subjective sleep quality continuity, duration and initiation. Systematic assessments of sleep in early intervention settings may allow early identification and treatment of sleep disturbances in this population.
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Affiliation(s)
- Clément Dondé
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Adult Psychiatry Department, Grenoble Institut Neurosciences, 38000 Grenoble, France
| | - Antoine Jaffiol
- Univ. Grenoble Alpes, CHU Grenoble Alpes, Adult Psychiatry Department, 38000 Grenoble, France
| | - Charles Khouri
- Univ. Grenoble Alpes, CHU Grenoble Alpes, HP2, Clinical Pharmacology Department, INSERM CIC1406, 38000 Grenoble, France
| | - Arnaud Pouchon
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Adult Psychiatry Department, Grenoble Institut Neurosciences, 38000 Grenoble, France
| | - Renaud Tamisier
- Univ. Grenoble Alpes, INSERM, CHU Grenoble Alpes, HP2, Pneumology and Physiology Department, Thorax and vessels pole, 38000 Grenoble, France
| | - Michel Lejoyeux
- Université de Paris, Psychiatry and Addictology Department, AP-HP, GHU Paris Nord, DMU Neurosciences, Bichat Hospital - Claude Bernard, GHU Paris - Psychiatry & Neurosciences, Paris, France
| | - Marie-Pia d'Ortho
- Université de Paris, NeuroDiderot, Inserm U1141, Sleep Medicine and Clinical Physiology Department, AP-HP, GHU Paris Nord, DMU DREAM, Bichat Hospital, Paris, France
| | - Mircea Polosan
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Adult Psychiatry Department, Grenoble Institut Neurosciences, 38000 Grenoble, France
| | - Pierre A Geoffroy
- Université de Paris, Psychiatry and Addictology Department, AP-HP, GHU Paris Nord, DMU Neurosciences, Bichat Hospital - Claude Bernard, GHU Paris - Psychiatry & Neurosciences, Paris, France.,Université de Paris, NeuroDiderot, Inserm U1141, Sleep Medicine and Clinical Physiology Department, AP-HP, GHU Paris Nord, DMU DREAM, Bichat Hospital, Paris, France
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Pillny M, Krkovic K, Buck L, Lincoln TM. From Memories of Past Experiences to Present Motivation? A Meta-analysis on the Association Between Episodic Memory and Negative Symptoms in People With Psychosis. Schizophr Bull 2022; 48:307-324. [PMID: 34635918 PMCID: PMC8886596 DOI: 10.1093/schbul/sbab120] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Based on findings from cognitive science, it has been theorized that the reductions in motivation and goal-directed behavior in people with psychosis could stem from impaired episodic memory. In the current meta-analysis, we investigated this putative functional link between episodic memory deficits and negative symptoms. We hypothesized that episodic memory deficits in psychosis would be related to negative symptoms in general but would be more strongly related to amotivation than to reduced expressivity. We included 103 eligible studies (13,622 participants) in the analyses. Results revealed significant, moderate negative associations of episodic memory with negative symptoms in general (k = 103; r = -.23; z = -13.40; P ≤ .001; 95% CI [-.26; -.20]), with amotivation (k = 16; r = -.18; z = -6.6; P ≤ .001; 95% CI [-.23; -.13]) and with reduced expressivity (k = 15; r = -.18; z = -3.30; P ≤.001; 95% CI[-.29; -.07]). These associations were not moderated by sociodemographic characteristics, positive symptoms, depression, antipsychotic medication or type of negative symptom scale. Although these findings provide sound evidence for the association between episodic memory deficits and amotivation, the rather small magnitude and the unspecific pattern of this relationship also indicate that episodic memory deficits are unlikely to be the only factor relevant to amotivation. This implicates that future research should investigate episodic memory in conjunction with other factors that could account for the association of episodic memory deficits and amotivation in psychosis.
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Affiliation(s)
- Matthias Pillny
- Clinical Psychology and Psychotherapy, Universität Hamburg, Hamburg, Germany
| | - Katarina Krkovic
- Clinical Psychology and Psychotherapy, Universität Hamburg, Hamburg, Germany
| | - Laura Buck
- Clinical Psychology and Psychotherapy, Universität Hamburg, Hamburg, Germany
| | - Tania M Lincoln
- Clinical Psychology and Psychotherapy, Universität Hamburg, Hamburg, Germany
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Association of polygenic risk for schizophrenia with fast sleep spindle density depends on pro-cognitive variants. Eur Arch Psychiatry Clin Neurosci 2022; 272:1193-1203. [PMID: 35723738 PMCID: PMC9508216 DOI: 10.1007/s00406-022-01435-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 05/15/2022] [Indexed: 11/14/2022]
Abstract
Cognitive impairment is a common feature in schizophrenia and the strongest prognostic factor for long-term outcome. Identifying a trait associated with the genetic background for cognitive outcome in schizophrenia may aid in a deeper understanding of clinical disease subtypes. Fast sleep spindles may represent such a biomarker as they are strongly genetically determined, associated with cognitive functioning and impaired in schizophrenia and unaffected relatives. We measured fast sleep spindle density in 150 healthy adults and investigated its association with a genome-wide polygenic score for schizophrenia (SCZ-PGS). The association between SCZ-PGS and fast spindle density was further characterized by stratifying it to the genetic background of intelligence. SCZ-PGS was positively associated with fast spindle density. This association mainly depended on pro-cognitive genetic variants. Our results strengthen the evidence for a genetic background of spindle abnormalities in schizophrenia. Spindle density might represent an easily accessible marker for a favourable cognitive outcome which should be further investigated in clinical samples.
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