{"id":"https://openalex.org/W2085374261","doi":"https://doi.org/10.1016/j.schres.2004.02.015","title":"Decreased nonlinear complexity and chaos during sleep in first episode schizophrenia: a preliminary report","display_name":"Decreased nonlinear complexity and chaos during sleep in first episode schizophrenia: a preliminary report","publication_year":2004,"publication_date":"2004-04-28","ids":{"openalex":"https://openalex.org/W2085374261","doi":"https://doi.org/10.1016/j.schres.2004.02.015","mag":"2085374261","pmid":"https://pubmed.ncbi.nlm.nih.gov/15474897"},"language":"en","primary_location":{"id":"doi:10.1016/j.schres.2004.02.015","doi":"https://doi.org/10.1016/j.schres.2004.02.015","is_oa":false,"landing_page_url":"https://doi.org/10.1016/j.schres.2004.02.015","pdf_url":null,"source":{"id":"https://openalex.org/S144105592","display_name":"Schizophrenia Research","issn_l":"0920-9964","issn":["0920-9964","1573-2509"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-c","doyens","erih-plus","jufo-2","ki-jl-2","medline","norway-2","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Schizophrenia Research","raw_type":"journal-article"},"volume":null,"type":"article","indexed_in":["crossref","pubmed"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5000706062","display_name":"Matcheri S. Keshavan","orcid":"https://orcid.org/0000-0002-5945-888X","observed_orcids":["https://orcid.org/0000-0002-5945-888X"]},"institutions":[{"id":"https://openalex.org/I170201317","display_name":"University of Pittsburgh","ror":"https://ror.org/01an3r305","country_code":"US","type":"education","lineage":["https://openalex.org/I170201317"]},{"id":"https://openalex.org/I4210098814","display_name":"UPMC Health System","ror":"https://ror.org/011htkb76","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I4210098814"]},{"id":"https://openalex.org/I4210134769","display_name":"University of Pittsburgh Medical Center","ror":"https://ror.org/04ehecz88","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I4210098814","https://openalex.org/I4210134769"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Matcheri S. Keshavan","raw_affiliation_strings":["Department of Psychiatry, University of Pittsburgh School of Medicine, UPMC Health System-Western Psychiatric Institute and Clinic, Room 441, 3811 O'Hara Street, Pittsburgh, PA 15213, USA. keshavanms@upmc.edu","Department of Psychiatry, University of Pittsburgh School of Medicine, UPMC Health System-Western Psychiatric Institute and Clinic, Room 441, 3811 O'Hara Street, Pittsburgh, PA 15213, USA"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Psychiatry, University of Pittsburgh School of Medicine, UPMC Health System-Western Psychiatric Institute and Clinic, Room 441, 3811 O'Hara Street, Pittsburgh, PA 15213, USA. keshavanms@upmc.edu","institution_ids":["https://openalex.org/I170201317","https://openalex.org/I4210098814","https://openalex.org/I4210134769"]},{"raw_affiliation_string":"Department of Psychiatry, University of Pittsburgh School of Medicine, UPMC Health System-Western Psychiatric Institute and Clinic, Room 441, 3811 O'Hara Street, Pittsburgh, PA 15213, USA","institution_ids":["https://openalex.org/I170201317","https://openalex.org/I4210098814","https://openalex.org/I4210134769"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5067308596","display_name":"J. David Cashmere","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I170201317","display_name":"University of Pittsburgh","ror":"https://ror.org/01an3r305","country_code":"US","type":"education","lineage":["https://openalex.org/I170201317"]},{"id":"https://openalex.org/I4210098814","display_name":"UPMC Health System","ror":"https://ror.org/011htkb76","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I4210098814"]},{"id":"https://openalex.org/I4210134769","display_name":"University of Pittsburgh Medical Center","ror":"https://ror.org/04ehecz88","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I4210098814","https://openalex.org/I4210134769"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"J.David Cashmere","raw_affiliation_strings":["Department of Psychiatry, University of Pittsburgh School of Medicine, UPMC Health System-Western Psychiatric Institute and Clinic, Room 441, 3811 O'Hara Street, Pittsburgh, PA 15213, USA"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Psychiatry, University of Pittsburgh School of Medicine, UPMC Health System-Western Psychiatric Institute and Clinic, Room 441, 3811 O'Hara Street, Pittsburgh, PA 15213, USA","institution_ids":["https://openalex.org/I170201317","https://openalex.org/I4210098814","https://openalex.org/I4210134769"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5083511806","display_name":"Jean M. Miewald","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I170201317","display_name":"University of Pittsburgh","ror":"https://ror.org/01an3r305","country_code":"US","type":"education","lineage":["https://openalex.org/I170201317"]},{"id":"https://openalex.org/I4210098814","display_name":"UPMC Health System","ror":"https://ror.org/011htkb76","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I4210098814"]},{"id":"https://openalex.org/I4210134769","display_name":"University of Pittsburgh Medical Center","ror":"https://ror.org/04ehecz88","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I4210098814","https://openalex.org/I4210134769"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Jean Miewald","raw_affiliation_strings":["Department of Psychiatry, University of Pittsburgh School of Medicine, UPMC Health System-Western Psychiatric Institute and Clinic, Room 441, 3811 O'Hara Street, Pittsburgh, PA 15213, USA"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Psychiatry, University of Pittsburgh School of Medicine, UPMC Health System-Western Psychiatric Institute and Clinic, Room 441, 3811 O'Hara Street, Pittsburgh, PA 15213, USA","institution_ids":["https://openalex.org/I170201317","https://openalex.org/I4210098814","https://openalex.org/I4210134769"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5112101929","display_name":"Vikram Kumar Yeragani","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I185443292","display_name":"Wayne State University","ror":"https://ror.org/01070mq45","country_code":"US","type":"education","lineage":["https://openalex.org/I185443292"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Vikram Kumar Yeragani","raw_affiliation_strings":["Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, MI, USA"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, MI, USA","institution_ids":["https://openalex.org/I185443292"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":4,"corresponding_author_ids":["https://openalex.org/A5000706062"],"corresponding_institution_ids":["https://openalex.org/I170201317","https://openalex.org/I4210098814","https://openalex.org/I4210134769"],"apc_list":{"value":3910,"currency":"USD","value_usd":3910},"apc_paid":null,"fwci":1.0373,"has_fulltext":false,"cited_by_count":36,"citation_normalized_percentile":{"value":0.77618587,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":88,"max":98},"biblio":{"volume":"71","issue":"2-3","first_page":"263","last_page":"272"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10023","display_name":"Schizophrenia research and treatment","score":0.490200012922287,"subfield":{"id":"https://openalex.org/subfields/2738","display_name":"Psychiatry and Mental health"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},"topics":[{"id":"https://openalex.org/T10023","display_name":"Schizophrenia research and treatment","score":0.490200012922287,"subfield":{"id":"https://openalex.org/subfields/2738","display_name":"Psychiatry and Mental health"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10985","display_name":"Sleep and Wakefulness Research","score":0.2102999985218048,"subfield":{"id":"https://openalex.org/subfields/2805","display_name":"Cognitive Neuroscience"},"field":{"id":"https://openalex.org/fields/28","display_name":"Neuroscience"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10316","display_name":"Sleep and related disorders","score":0.06390000134706497,"subfield":{"id":"https://openalex.org/subfields/3205","display_name":"Experimental and Cognitive Psychology"},"field":{"id":"https://openalex.org/fields/32","display_name":"Psychology"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/schizophrenia","display_name":"schizophrenia","score":0.8199999928474426},{"id":"https://openalex.org/keywords/first-episode-schizophrenia","display_name":"first-episode schizophrenia","score":0.8209999799728394}],"concepts":[{"id":"https://openalex.org/C2776412080","wikidata":"https://www.wikidata.org/wiki/Q7431605","display_name":"Schizophrenia (object-oriented programming)","level":2,"score":0.6789668798446655},{"id":"https://openalex.org/C15744967","wikidata":"https://www.wikidata.org/wiki/Q9418","display_name":"Psychology","level":0,"score":0.6478049755096436},{"id":"https://openalex.org/C522805319","wikidata":"https://www.wikidata.org/wiki/Q179965","display_name":"Electroencephalography","level":2,"score":0.6374425888061523},{"id":"https://openalex.org/C172467417","wikidata":"https://www.wikidata.org/wiki/Q1670397","display_name":"Neurocognitive","level":3,"score":0.6034946441650391},{"id":"https://openalex.org/C2779727114","wikidata":"https://www.wikidata.org/wiki/Q170082","display_name":"Psychosis","level":2,"score":0.49616488814353943},{"id":"https://openalex.org/C110539466","wikidata":"https://www.wikidata.org/wiki/Q3964845","display_name":"Slow-wave sleep","level":3,"score":0.47987642884254456},{"id":"https://openalex.org/C2775841894","wikidata":"https://www.wikidata.org/wiki/Q4683692","display_name":"Sleep (system call)","level":2,"score":0.46793505549430847},{"id":"https://openalex.org/C63759246","wikidata":"https://www.wikidata.org/wiki/Q7539762","display_name":"Sleep onset","level":3,"score":0.45754098892211914},{"id":"https://openalex.org/C2780325297","wikidata":"https://www.wikidata.org/wiki/Q834047","display_name":"Schizoaffective disorder","level":3,"score":0.43550339341163635},{"id":"https://openalex.org/C50610925","wikidata":"https://www.wikidata.org/wiki/Q1136816","display_name":"Habituation","level":2,"score":0.42983388900756836},{"id":"https://openalex.org/C20566671","wikidata":"https://www.wikidata.org/wiki/Q1752878","display_name":"Non-rapid eye movement sleep","level":3,"score":0.4275822639465332},{"id":"https://openalex.org/C548259974","wikidata":"https://www.wikidata.org/wiki/Q569965","display_name":"Audiology","level":1,"score":0.40987667441368103},{"id":"https://openalex.org/C169760540","wikidata":"https://www.wikidata.org/wiki/Q207011","display_name":"Neuroscience","level":1,"score":0.3917958438396454},{"id":"https://openalex.org/C118552586","wikidata":"https://www.wikidata.org/wiki/Q7867","display_name":"Psychiatry","level":1,"score":0.35236412286758423},{"id":"https://openalex.org/C169900460","wikidata":"https://www.wikidata.org/wiki/Q2200417","display_name":"Cognition","level":2,"score":0.23604938387870789},{"id":"https://openalex.org/C2781210498","wikidata":"https://www.wikidata.org/wiki/Q1869874","display_name":"Insomnia","level":2,"score":0.19926601648330688},{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.19658178091049194},{"id":"https://openalex.org/C111919701","wikidata":"https://www.wikidata.org/wiki/Q9135","display_name":"Operating system","level":1,"score":0.0},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.0}],"mesh":[{"descriptor_ui":"D000328","descriptor_name":"Adult","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D003072","descriptor_name":"Cognition Disorders","qualifier_ui":"Q000175","qualifier_name":"diagnosis","is_major_topic":false},{"descriptor_ui":"D003072","descriptor_name":"Cognition Disorders","qualifier_ui":"Q000453","qualifier_name":"epidemiology","is_major_topic":false},{"descriptor_ui":"D004569","descriptor_name":"Electroencephalography","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D004576","descriptor_name":"Electromyography","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D004585","descriptor_name":"Electrooculography","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D005152","descriptor_name":"Facial Muscles","qualifier_ui":"Q000294","qualifier_name":"innervation","is_major_topic":false},{"descriptor_ui":"D005260","descriptor_name":"Female","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D008297","descriptor_name":"Male","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D012559","descriptor_name":"Schizophrenia","qualifier_ui":"Q000175","qualifier_name":"diagnosis","is_major_topic":false},{"descriptor_ui":"D012559","descriptor_name":"Schizophrenia","qualifier_ui":"Q000453","qualifier_name":"epidemiology","is_major_topic":true},{"descriptor_ui":"D012893","descriptor_name":"Sleep Wake Disorders","qualifier_ui":"Q000175","qualifier_name":"diagnosis","is_major_topic":false},{"descriptor_ui":"D012893","descriptor_name":"Sleep Wake Disorders","qualifier_ui":"Q000453","qualifier_name":"epidemiology","is_major_topic":true},{"descriptor_ui":"D012893","descriptor_name":"Sleep Wake Disorders","qualifier_ui":"Q000503","qualifier_name":"physiopathology","is_major_topic":true},{"descriptor_ui":"D012894","descriptor_name":"Sleep Stages","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false}],"locations_count":2,"locations":[{"id":"doi:10.1016/j.schres.2004.02.015","doi":"https://doi.org/10.1016/j.schres.2004.02.015","is_oa":false,"landing_page_url":"https://doi.org/10.1016/j.schres.2004.02.015","pdf_url":null,"source":{"id":"https://openalex.org/S144105592","display_name":"Schizophrenia Research","issn_l":"0920-9964","issn":["0920-9964","1573-2509"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-c","doyens","erih-plus","jufo-2","ki-jl-2","medline","norway-2","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Schizophrenia Research","raw_type":"journal-article"},{"id":"pmid:15474897","doi":null,"is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/15474897","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Schizophrenia research","raw_type":"Journal Article"}],"best_oa_location":null,"sustainable_development_goals":[{"score":0.7246000170707703,"id":"https://metadata.un.org/sdg/3","display_name":"Good health and well-being"}],"sustainable_development_goals_aurora":[{"score":0.7599999904632568,"id":"https://metadata.un.org/sdg/4","display_name":"Quality education"}],"study_designs":[{"id":"https://openalex.org/study-designs/observational-study","display_name":"Observational Study"}],"awards":[{"id":"https://openalex.org/G3284271864","display_name":null,"funder_award_id":"MH 45156","funder_id":"https://openalex.org/F4320337346","funder_display_name":"National Institute of Mental Health"},{"id":"https://openalex.org/G3392199064","display_name":"EEG SLEEP AND NEURODEVELOPMENT IN SCHIZOPHRENIA","funder_award_id":"R01MH045203","funder_id":"https://openalex.org/F4320337346","funder_display_name":"National Institute of Mental Health"},{"id":"https://openalex.org/G4003309079","display_name":null,"funder_award_id":"MH45203","funder_id":"https://openalex.org/F4320337346","funder_display_name":"National Institute of Mental Health"},{"id":"https://openalex.org/G5053564491","display_name":null,"funder_award_id":"MH 01180","funder_id":"https://openalex.org/F4320337346","funder_display_name":"National Institute of Mental Health"},{"id":"https://openalex.org/G7497526274","display_name":"BRAIN MATURATION AND VULNERABILITY TO SCHIZOPHRENIA","funder_award_id":"K02MH001180","funder_id":"https://openalex.org/F4320337346","funder_display_name":"National Institute of Mental Health"},{"id":"https://openalex.org/G8057162315","display_name":"Cortical Circuitry and Cognition in Schizophrenia","funder_award_id":"P50MH045156","funder_id":"https://openalex.org/F4320337346","funder_display_name":"National Institute of Mental Health"}],"funders":[{"id":"https://openalex.org/F4320337346","display_name":"National Institute of Mental Health","ror":"https://ror.org/04xeg9z08"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":66,"referenced_works":["https://openalex.org/W595101455","https://openalex.org/W1536870549","https://openalex.org/W1549755983","https://openalex.org/W1951501030","https://openalex.org/W1964694080","https://openalex.org/W1966460145","https://openalex.org/W1966617449","https://openalex.org/W1967591306","https://openalex.org/W1967806344","https://openalex.org/W1968025560","https://openalex.org/W1970073498","https://openalex.org/W1975964493","https://openalex.org/W1985185626","https://openalex.org/W1986488785","https://openalex.org/W1990288760","https://openalex.org/W1993560189","https://openalex.org/W2003283509","https://openalex.org/W2010461070","https://openalex.org/W2012726130","https://openalex.org/W2014324598","https://openalex.org/W2020793555","https://openalex.org/W2024939205","https://openalex.org/W2025408203","https://openalex.org/W2027480284","https://openalex.org/W2029401646","https://openalex.org/W2031153552","https://openalex.org/W2031365860","https://openalex.org/W2032067190","https://openalex.org/W2043941998","https://openalex.org/W2044707217","https://openalex.org/W2046335857","https://openalex.org/W2049941387","https://openalex.org/W2050505355","https://openalex.org/W2055124633","https://openalex.org/W2061100155","https://openalex.org/W2062948063","https://openalex.org/W2067018765","https://openalex.org/W2071661818","https://openalex.org/W2072062726","https://openalex.org/W2072394517","https://openalex.org/W2073967924","https://openalex.org/W2086921646","https://openalex.org/W2088470848","https://openalex.org/W2090623475","https://openalex.org/W2100821684","https://openalex.org/W2114344528","https://openalex.org/W2124428761","https://openalex.org/W2125934973","https://openalex.org/W2128377432","https://openalex.org/W2148243305","https://openalex.org/W2152254020","https://openalex.org/W2159011576","https://openalex.org/W2164088768","https://openalex.org/W2175220384","https://openalex.org/W2181502492","https://openalex.org/W2213127880","https://openalex.org/W2399532265","https://openalex.org/W2412993574","https://openalex.org/W2418659172","https://openalex.org/W2525537354","https://openalex.org/W2599734864","https://openalex.org/W3022302886","https://openalex.org/W3176826459","https://openalex.org/W3182827017","https://openalex.org/W3214872913","https://openalex.org/W4238048863"],"related_works":["https://openalex.org/W1967591306","https://openalex.org/W2032067190","https://openalex.org/W2025408203","https://openalex.org/W2395126639","https://openalex.org/W2141352177","https://openalex.org/W2334787602","https://openalex.org/W2890510501","https://openalex.org/W2552279786","https://openalex.org/W2749277162","https://openalex.org/W2090623475"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":1},{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":1},{"year":2021,"cited_by_count":1},{"year":2020,"cited_by_count":1},{"year":2019,"cited_by_count":1},{"year":2017,"cited_by_count":3},{"year":2016,"cited_by_count":3},{"year":2015,"cited_by_count":3},{"year":2014,"cited_by_count":1},{"year":2012,"cited_by_count":4}],"updated_date":"2026-10-31T12:09:11.096373","created_date":"2016-06-24T00:00:00"}
