{"id":"https://openalex.org/W2004161101","doi":"https://doi.org/10.1016/j.appet.2010.01.003","title":"l-Theanine and caffeine improve task switching but not intersensory attention or subjective alertness","display_name":"l-Theanine and caffeine improve task switching but not intersensory attention or subjective alertness","publication_year":2010,"publication_date":"2010-01-16","ids":{"openalex":"https://openalex.org/W2004161101","doi":"https://doi.org/10.1016/j.appet.2010.01.003","mag":"2004161101","pmid":"https://pubmed.ncbi.nlm.nih.gov/20079786"},"language":"en","primary_location":{"id":"doi:10.1016/j.appet.2010.01.003","doi":"https://doi.org/10.1016/j.appet.2010.01.003","is_oa":false,"landing_page_url":"https://doi.org/10.1016/j.appet.2010.01.003","pdf_url":null,"source":{"id":"https://openalex.org/S126804734","display_name":"Appetite","issn_l":"0195-6663","issn":["0195-6663","1095-8304"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["abdc-a","anvur-scientific","cwts-core","dongbi-c","doyens","fnege-3","jufo-2","ki-jl-1","medline","norway-1","poland-100","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":"Appetite","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/A5001475645","display_name":"Suzanne J.L. Ein\u00f6ther","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4405281337","display_name":"Unilever Research and Development Vlaardingen","ror":"https://ror.org/047hzsk31","country_code":"NL","type":"facility","lineage":["https://openalex.org/I1342131907","https://openalex.org/I4210113155","https://openalex.org/I4405281337"]}],"countries":["NL"],"is_corresponding":true,"raw_author_name":"Suzanne J.L. Ein\u00f6ther","raw_affiliation_strings":["Sensation, Perception & Behaviour, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands. Suzanne.Einother@Unilever.com","Sensation, Perception & Behaviour, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Sensation, Perception & Behaviour, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands. Suzanne.Einother@Unilever.com","institution_ids":["https://openalex.org/I4405281337"]},{"raw_affiliation_string":"Sensation, Perception & Behaviour, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands","institution_ids":["https://openalex.org/I4405281337"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5038021937","display_name":"Vanessa E.G. Martens","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4405281337","display_name":"Unilever Research and Development Vlaardingen","ror":"https://ror.org/047hzsk31","country_code":"NL","type":"facility","lineage":["https://openalex.org/I1342131907","https://openalex.org/I4210113155","https://openalex.org/I4405281337"]}],"countries":["NL"],"is_corresponding":false,"raw_author_name":"Vanessa E.G. Martens","raw_affiliation_strings":["Sensation, Perception & Behaviour, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Sensation, Perception & Behaviour, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands","institution_ids":["https://openalex.org/I4405281337"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5073032277","display_name":"Jane A. Rycroft","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1342131907","display_name":"Unilever (United Kingdom)","ror":"https://ror.org/05n8ah907","country_code":"GB","type":"company","lineage":["https://openalex.org/I1342131907"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Jane A. Rycroft","raw_affiliation_strings":["Lipton Institute of Tea, Unilever R&D Colworth, Sharnbrook, Bedford, United Kingdom"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Lipton Institute of Tea, Unilever R&D Colworth, Sharnbrook, Bedford, United Kingdom","institution_ids":["https://openalex.org/I1342131907"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5055752212","display_name":"Eveline A. de Bruin","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4405281337","display_name":"Unilever Research and Development Vlaardingen","ror":"https://ror.org/047hzsk31","country_code":"NL","type":"facility","lineage":["https://openalex.org/I1342131907","https://openalex.org/I4210113155","https://openalex.org/I4405281337"]}],"countries":["NL"],"is_corresponding":false,"raw_author_name":"Eveline A. De Bruin","raw_affiliation_strings":["Sensation, Perception & Behaviour, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Sensation, Perception & Behaviour, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands","institution_ids":["https://openalex.org/I4405281337"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5001475645"],"corresponding_institution_ids":["https://openalex.org/I4405281337"],"apc_list":{"value":4190,"currency":"USD","value_usd":4190},"apc_paid":null,"fwci":4.6597,"has_fulltext":false,"cited_by_count":65,"citation_normalized_percentile":{"value":0.94781534,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":88,"max":99},"biblio":{"volume":"54","issue":"2","first_page":"406","last_page":"409"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11264","display_name":"Coffee research and impacts","score":0.9965999722480774,"subfield":{"id":"https://openalex.org/subfields/2736","display_name":"Pharmacology (medical)"},"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/T11264","display_name":"Coffee research and impacts","score":0.9965999722480774,"subfield":{"id":"https://openalex.org/subfields/2736","display_name":"Pharmacology (medical)"},"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/T11373","display_name":"Sleep and Work-Related Fatigue","score":0.0013000000035390258,"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"}},{"id":"https://openalex.org/T11411","display_name":"Tea Polyphenols and Effects","score":0.0003000000142492354,"subfield":{"id":"https://openalex.org/subfields/2734","display_name":"Pathology and Forensic Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/l-theanine","display_name":"theanine","score":1.0},{"id":"https://openalex.org/keywords/caffeine","display_name":"caffeine","score":1.0},{"id":"https://openalex.org/keywords/tea","display_name":"tea","score":0.5419999957084656},{"id":"https://openalex.org/keywords/task-switching","display_name":"task switching","score":0.8510000109672546},{"id":"https://openalex.org/keywords/attention","display_name":"attention","score":0.5199999809265137},{"id":"https://openalex.org/keywords/subjective-alertness","display_name":"subjective alertness","score":0.9610000252723694},{"id":"https://openalex.org/keywords/combined-supplementation","display_name":"combination supplementation","score":0.49000000953674316},{"id":"https://openalex.org/keywords/cognitive-performance","display_name":"cognitive performance","score":0.546999990940094}],"concepts":[{"id":"https://openalex.org/C200678441","wikidata":"https://www.wikidata.org/wiki/Q1423044","display_name":"Alertness","level":2,"score":0.8889768123626709},{"id":"https://openalex.org/C2778500429","wikidata":"https://www.wikidata.org/wiki/Q60235","display_name":"Caffeine","level":2,"score":0.6260716915130615},{"id":"https://openalex.org/C15744967","wikidata":"https://www.wikidata.org/wiki/Q9418","display_name":"Psychology","level":0,"score":0.6042552590370178},{"id":"https://openalex.org/C180747234","wikidata":"https://www.wikidata.org/wiki/Q23373","display_name":"Cognitive psychology","level":1,"score":0.4851420819759369},{"id":"https://openalex.org/C93500599","wikidata":"https://www.wikidata.org/wiki/Q7687352","display_name":"Task switching","level":3,"score":0.4526006579399109},{"id":"https://openalex.org/C548259974","wikidata":"https://www.wikidata.org/wiki/Q569965","display_name":"Audiology","level":1,"score":0.4420253336429596},{"id":"https://openalex.org/C2780451532","wikidata":"https://www.wikidata.org/wiki/Q759676","display_name":"Task (project management)","level":2,"score":0.4360429346561432},{"id":"https://openalex.org/C169760540","wikidata":"https://www.wikidata.org/wiki/Q207011","display_name":"Neuroscience","level":1,"score":0.3120347857475281},{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.28885406255722046},{"id":"https://openalex.org/C169900460","wikidata":"https://www.wikidata.org/wiki/Q2200417","display_name":"Cognition","level":2,"score":0.13299983739852905},{"id":"https://openalex.org/C118552586","wikidata":"https://www.wikidata.org/wiki/Q7867","display_name":"Psychiatry","level":1,"score":0.10318782925605774},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.05924120545387268},{"id":"https://openalex.org/C201995342","wikidata":"https://www.wikidata.org/wiki/Q682496","display_name":"Systems engineering","level":1,"score":0.0}],"mesh":[{"descriptor_ui":"D000293","descriptor_name":"Adolescent","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D000328","descriptor_name":"Adult","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D000339","descriptor_name":"Affect","qualifier_ui":"Q000187","qualifier_name":"drug effects","is_major_topic":false},{"descriptor_ui":"D000339","descriptor_name":"Affect","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D000697","descriptor_name":"Central Nervous System Stimulants","qualifier_ui":"Q000494","qualifier_name":"pharmacology","is_major_topic":true},{"descriptor_ui":"D000704","descriptor_name":"Analysis of Variance","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D001288","descriptor_name":"Attention","qualifier_ui":"Q000187","qualifier_name":"drug effects","is_major_topic":false},{"descriptor_ui":"D001288","descriptor_name":"Attention","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D001628","descriptor_name":"Beverages","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D002110","descriptor_name":"Caffeine","qualifier_ui":"Q000494","qualifier_name":"pharmacology","is_major_topic":true},{"descriptor_ui":"D003071","descriptor_name":"Cognition","qualifier_ui":"Q000187","qualifier_name":"drug effects","is_major_topic":true},{"descriptor_ui":"D003071","descriptor_name":"Cognition","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D004311","descriptor_name":"Double-Blind Method","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D005260","descriptor_name":"Female","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D005971","descriptor_name":"Glutamates","qualifier_ui":"Q000494","qualifier_name":"pharmacology","is_major_topic":true},{"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":"D008875","descriptor_name":"Middle Aged","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D012677","descriptor_name":"Sensation","qualifier_ui":"Q000187","qualifier_name":"drug effects","is_major_topic":false},{"descriptor_ui":"D013647","descriptor_name":"Task Performance and Analysis","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D013662","descriptor_name":"Tea","qualifier_ui":"Q000737","qualifier_name":"chemistry","is_major_topic":true},{"descriptor_ui":"D013997","descriptor_name":"Time Factors","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D018592","descriptor_name":"Cross-Over Studies","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D055815","descriptor_name":"Young Adult","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false}],"locations_count":2,"locations":[{"id":"doi:10.1016/j.appet.2010.01.003","doi":"https://doi.org/10.1016/j.appet.2010.01.003","is_oa":false,"landing_page_url":"https://doi.org/10.1016/j.appet.2010.01.003","pdf_url":null,"source":{"id":"https://openalex.org/S126804734","display_name":"Appetite","issn_l":"0195-6663","issn":["0195-6663","1095-8304"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["abdc-a","anvur-scientific","cwts-core","dongbi-c","doyens","fnege-3","jufo-2","ki-jl-1","medline","norway-1","poland-100","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":"Appetite","raw_type":"journal-article"},{"id":"pmid:20079786","doi":null,"is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/20079786","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":"Appetite","raw_type":"Journal Article"}],"best_oa_location":null,"sustainable_development_goals":[{"display_name":"Good health and well-being","score":0.6240000128746033,"id":"https://metadata.un.org/sdg/3"}],"study_designs":[{"display_name":"Randomized Controlled Trial","id":"https://openalex.org/study-designs/randomized-controlled-trial"},{"display_name":"Clinical Trial","id":"https://openalex.org/study-designs/clinical-trial"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":33,"referenced_works":["https://openalex.org/W65511682","https://openalex.org/W107648203","https://openalex.org/W1785176519","https://openalex.org/W1955323883","https://openalex.org/W1964833004","https://openalex.org/W1984080268","https://openalex.org/W1985148653","https://openalex.org/W1998008504","https://openalex.org/W2011154018","https://openalex.org/W2011521155","https://openalex.org/W2013335354","https://openalex.org/W2017841158","https://openalex.org/W2020400890","https://openalex.org/W2023817296","https://openalex.org/W2032565719","https://openalex.org/W2037091206","https://openalex.org/W2038147650","https://openalex.org/W2038766523","https://openalex.org/W2055572857","https://openalex.org/W2069200516","https://openalex.org/W2071783141","https://openalex.org/W2073766890","https://openalex.org/W2080350121","https://openalex.org/W2096266931","https://openalex.org/W2098358832","https://openalex.org/W2102338359","https://openalex.org/W2103673251","https://openalex.org/W2124789507","https://openalex.org/W2128767308","https://openalex.org/W2128894720","https://openalex.org/W2134663262","https://openalex.org/W2138988898","https://openalex.org/W2156761163"],"related_works":["https://openalex.org/W20955124","https://openalex.org/W1964833004","https://openalex.org/W1985148653","https://openalex.org/W1955323883","https://openalex.org/W1785176519","https://openalex.org/W4413107228","https://openalex.org/W2011154018","https://openalex.org/W2260789379","https://openalex.org/W2045803894","https://openalex.org/W2150255013"],"abstract_inverted_index":null,"counts_by_year":[{"year":2026,"cited_by_count":4},{"year":2025,"cited_by_count":6},{"year":2024,"cited_by_count":4},{"year":2023,"cited_by_count":3},{"year":2022,"cited_by_count":1},{"year":2021,"cited_by_count":1},{"year":2020,"cited_by_count":2},{"year":2019,"cited_by_count":5},{"year":2018,"cited_by_count":2},{"year":2017,"cited_by_count":4},{"year":2016,"cited_by_count":6},{"year":2015,"cited_by_count":3},{"year":2014,"cited_by_count":3},{"year":2013,"cited_by_count":9},{"year":2012,"cited_by_count":3}],"updated_date":"2026-11-04T10:54:05.112534","created_date":"2016-06-24T00:00:00"}