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• {"link"=>{"url"=>"http://www.citeulike.org/user/dullhunk/article/3831288"}, "post_time"=>"2008-12-28 21:43:10", "tag"=>"impact-factor", "linkout"=>{"type"=>"DOI", "url"=>"http://dx.doi.org/10.1371/journal.pone.0004048"}, "username"=>"dullhunk", "article_id"=>"3831288"}
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{"title"=>"The effects of aging on researchers' publication and citation patterns", "type"=>"journal", "authors"=>[{"first_name"=>"Yves", "last_name"=>"Gingras", "scopus_author_id"=>"6602494616"}, {"first_name"=>"Vincent", "last_name"=>"Larivière", "scopus_author_id"=>"14028805600"}, {"first_name"=>"Benoît", "last_name"=>"Macaluso", "scopus_author_id"=>"25932279000"}, {"first_name"=>"Jean Pierre", "last_name"=>"Robitaille", "scopus_author_id"=>"6701529071"}], "year"=>2008, "source"=>"PLoS ONE", "identifiers"=>{"scopus"=>"2-s2.0-58149177148", "doi"=>"10.1371/journal.pone.0004048", "sgr"=>"58149177148", "isbn"=>"1932-6203", "pmid"=>"19112502", "issn"=>"19326203", "pui"=>"354030413"}, "id"=>"a3754f69-0662-30ac-ab89-72717d43c976", "abstract"=>"The average age at which U.S. researchers receive their first grant from NIH has increased from 34.3 in 1970, to 41.7 in 2004. These data raise the crucial question of the effects of aging on the scientific productivity and impact of researchers. Drawing on a sizeable sample of 6,388 university professors in Quebec who have published at least one paper between 2000 and 2007, our results identify two turning points in the professors' careers. A first turning point is visible at age 40 years, where researchers start to rely on older literature and where their productivity increases at a slower pace--after having increased sharply since the beginning of their career. A second turning point can be seen around age 50, when researchers are the most productive whereas their average scientific impact is at its lowest. Our results also show that older professors publish fewer first-authored papers and move closer to the end of the list of co-authors. Although average scientific impact per paper decreases linearly until about age 50, the average number of papers in highly cited journals and among highly cited papers rises continuously until retirement. Our results show clearly that productivity and impact are not a simple and declining function of age and that we must take into account the collaborative aspects of scientific research. Science is a collective endeavor and, as our data shows, researchers of all ages play a significant role in its dynamic.", "link"=>"http://www.mendeley.com/research/effects-aging-researchers-publication-citation-patterns", "reader_count"=>109, "reader_count_by_academic_status"=>{"Unspecified"=>2, "Professor > Associate Professor"=>3, "Librarian"=>9, "Researcher"=>34, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>18, "Student > Postgraduate"=>4, "Student > Master"=>13, "Other"=>8, "Student > Bachelor"=>2, "Lecturer"=>2, "Professor"=>12}, "reader_count_by_user_role"=>{"Unspecified"=>2, "Professor > Associate Professor"=>3, "Librarian"=>9, "Researcher"=>34, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>18, "Student > Postgraduate"=>4, "Student > Master"=>13, "Other"=>8, "Student > Bachelor"=>2, "Lecturer"=>2, "Professor"=>12}, "reader_count_by_subject_area"=>{"Unspecified"=>9, "Agricultural and Biological Sciences"=>16, "Arts and Humanities"=>3, "Business, Management and Accounting"=>13, "Chemistry"=>1, "Computer Science"=>16, "Earth and Planetary Sciences"=>6, "Economics, Econometrics and Finance"=>2, "Environmental Science"=>2, "Biochemistry, Genetics and Molecular Biology"=>2, "Nursing and Health Professions"=>1, "Mathematics"=>1, "Medicine and Dentistry"=>7, "Physics and Astronomy"=>2, "Psychology"=>4, "Social Sciences"=>22, "Immunology and Microbiology"=>2}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>7}, "Social Sciences"=>{"Social Sciences"=>22}, "Physics and Astronomy"=>{"Physics and Astronomy"=>2}, "Psychology"=>{"Psychology"=>4}, "Mathematics"=>{"Mathematics"=>1}, "Unspecified"=>{"Unspecified"=>9}, "Environmental Science"=>{"Environmental Science"=>2}, "Arts and Humanities"=>{"Arts and Humanities"=>3}, "Chemistry"=>{"Chemistry"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>6}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>2}, "Immunology and Microbiology"=>{"Immunology and Microbiology"=>2}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>16}, "Computer Science"=>{"Computer Science"=>16}, "Business, Management and Accounting"=>{"Business, Management and Accounting"=>13}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>1}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>2}}, "reader_count_by_country"=>{"Romania"=>1, "United States"=>3, "Uruguay"=>1, "Tanzania"=>1, "United Kingdom"=>3, "Malaysia"=>2, "Spain"=>1, "Canada"=>1, "Venezuela"=>1, "Netherlands"=>3, "Belgium"=>1, "France"=>2, "Australia"=>1}, "group_count"=>6}

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Journal Comments | Further Information

• {"type"=>"COMMENT", "annotationUri"=>"info:doi/10.1371/annotation/ddb10559-d345-487e-af20-beaf3c0a3e1d", "title"=>"The dips around 50 might reflect a peak in distractions", "body"=>"One possible explanation for the dips around 50 might be a loss of time available for reading, and a peak in responsibilities for administration and teaching. An essential requirement for high impact research is having uninterrupted time for thinking. \n\nPolicy makers do not necessarily have to give more money to already-employed researchers to increase effective or high-impact research, but they do need to fund positions that allow researchers to work without too many distractions, at all times in their life. \n\nOf course, administration and teaching should be accepted by researchers, as social responsibilities, but the balance is important. We do not need under-employed younger researchers competing for salary and research funds with time-starved and over-employed mid-career researchers.", "isRemoved"=>false, "created"=>"2009-04-11T14:17:50Z", "lastModified"=>"2009-04-11T14:17:50Z", "creator"=>{"userId"=>"96857"}, "highlightedText"=>"", "competingInterestStatement"=>{"creatorWasPrompted"=>true, "hasCompetingInterests"=>false}, "parentArticle"=>{"doi"=>"info:doi/10.1371/journal.pone.0004048", "state"=>"published", "journals"=>{"PLoSONE"=>{"journalKey"=>"PLoSONE", "eIssn"=>"1932-6203", "title"=>"PLOS ONE"}}}, "replyTreeSize"=>0, "mostRecentActivity"=>"2009-04-11T14:17:50Z", "replies"=>[]}

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• {"id"=>"347007480922005504", "text"=>"According to \"The Effects of Aging on Researchers' Publication and ..\" I am at a turning point in my career! http://t.co/sfLlJqFkxQ", "created_at"=>"2013-06-18T15:06:45Z", "user"=>"svalver", "user_name"=>"Sergi Valverde", "user_profile_image"=>"http://a0.twimg.com/profile_images/3015559431/02e46824b44a2f3ee50db56bfeb1dc62_normal.jpeg"}
• {"id"=>"347011096365912065", "text"=>"Cool paper! Now to wait until I too become professor... :)\nMT @svalver I am at a turning point in my career! http://t.co/PB5hTOlXSs", "created_at"=>"2013-06-18T15:21:07Z", "user"=>"nicolasperony", "user_name"=>"Nicolas Perony", "user_profile_image"=>"http://a0.twimg.com/profile_images/2167562632/profile_normal.jpg"}
• {"id"=>"347482261010145280", "text"=>"The Effects of Aging on Researchers' Publication & Citation Patterns @PLOSONE http://t.co/2fuGKkApV5 Turning points", "created_at"=>"2013-06-19T22:33:21Z", "user"=>"Keith_Laws", "user_name"=>"Keith R Laws", "user_profile_image"=>"http://a0.twimg.com/profile_images/3338516269/0a3f633c7702d6e7a70fd6f1482e9e1a_normal.jpeg"}
• {"id"=>"347485976056188929", "text"=>"Professors peak at 50, check this chart http://t.co/RmiThJDaJm for more info see http://t.co/knFtckioKC", "created_at"=>"2013-06-19T22:48:07Z", "user"=>"cesifoti", "user_name"=>"Cesar A. Hidalgo", "user_profile_image"=>"http://a0.twimg.com/profile_images/3040227504/68ce6bf67fc69e8e101b0eb2337be47d_normal.png"}
• {"id"=>"347487636342050817", "text"=>"RT @cesifoti: Professors peak at 50, check this chart http://t.co/RmiThJDaJm for more info see http://t.co/knFtckioKC", "created_at"=>"2013-06-19T22:54:43Z", "user"=>"InesMergel", "user_name"=>"Ines Mergel", "user_profile_image"=>"http://a0.twimg.com/profile_images/3340007337/3e6d37193178a0cdcd3599554cdc9d43_normal.png"}
• {"id"=>"347488729767768064", "text"=>"The Effects of Aging on Researchers' Publication and Citation Patterns #PLOSONE http://t.co/bXxrOF3ewy", "created_at"=>"2013-06-19T22:59:03Z", "user"=>"marcohbello", "user_name"=>"Marco Bello", "user_profile_image"=>"http://a0.twimg.com/profile_images/3620052880/5f50dee493f975bade3aaea92e54dea4_normal.jpeg"}
• {"id"=>"347489087059537920", "text"=>"RT @cesifoti: Professors peak at 50, check this chart http://t.co/RmiThJDaJm for more info see http://t.co/knFtckioKC", "created_at"=>"2013-06-19T23:00:29Z", "user"=>"doctorerre", "user_name"=>"Dr. R", "user_profile_image"=>"http://a0.twimg.com/profile_images/1175244424/schroeder_normal.gif"}
• {"id"=>"347497994104471553", "text"=>"RT @cesifoti: Professors peak at 50, check this chart http://t.co/RmiThJDaJm for more info see http://t.co/knFtckioKC", "created_at"=>"2013-06-19T23:35:52Z", "user"=>"networkjaehee", "user_name"=>"Jaehee Park", "user_profile_image"=>"http://a0.twimg.com/profile_images/3767746946/adfa2a777d323979803e32a322215668_normal.jpeg"}
• {"id"=>"347504747181383681", "text"=>"RT @cesifoti: Professors peak at 50, check this chart http://t.co/RmiThJDaJm for more info see http://t.co/knFtckioKC", "created_at"=>"2013-06-20T00:02:42Z", "user"=>"RMSeals", "user_name"=>"Ryan Seals", "user_profile_image"=>"http://a0.twimg.com/profile_images/1670545948/seals_normal.jpg"}
• {"id"=>"347508528963006464", "text"=>"RT @cesifoti: Professors peak at 50, check this chart http://t.co/RmiThJDaJm for more info see http://t.co/knFtckioKC", "created_at"=>"2013-06-20T00:17:44Z", "user"=>"denisparra", "user_name"=>"denisparra", "user_profile_image"=>"http://a0.twimg.com/profile_images/3150064833/355871ecf6555b8de309174fd34415df_normal.jpeg"}
• {"id"=>"347521572254384128", "text"=>"RT @cesifoti: Professors peak at 50, check this chart http://t.co/RmiThJDaJm for more info see http://t.co/knFtckioKC", "created_at"=>"2013-06-20T01:09:34Z", "user"=>"ossimokryn", "user_name"=>"Ossi Mokryn", "user_profile_image"=>"http://a0.twimg.com/profile_images/2158597776/OssiAvatar_normal.jpg"}
• {"id"=>"347541937936543744", "text"=>"“@cesifoti: Professors peak at 50, check this chart http://t.co/sS7pdBvjL6 for more info see http://t.co/w8k5RxKJtL” I better get 2 work!", "created_at"=>"2013-06-20T02:30:29Z", "user"=>"laurienti", "user_name"=>"Paul Laurienti", "user_profile_image"=>"http://a0.twimg.com/profile_images/1934114997/ai_smalll_normal.jpg"}
• {"id"=>"347582482562023424", "text"=>"RT @Keith_Laws: The Effects of Aging on Researchers' Publication & Citation Patterns @PLOSONE http://t.co/2fuGKkApV5 Turning points", "created_at"=>"2013-06-20T05:11:36Z", "user"=>"asehelene", "user_name"=>"Åse Kvist Innes-Ker", "user_profile_image"=>"http://a0.twimg.com/profile_images/1725458884/heatmap_2011_normal.JPG"}
• {"id"=>"347596747985534976", "text"=>"Association of ageing with publication and citation rates in US researchers http://t.co/R3nhMTPNhP HT @Keith_Laws @PLOSONE", "created_at"=>"2013-06-20T06:08:17Z", "user"=>"SamJNorton", "user_name"=>"Sam Norton", "user_profile_image"=>"http://a0.twimg.com/profile_images/777615113/profile_normal.jpg"}
• {"id"=>"347608228865130496", "text"=>"RT @cesifoti: Professors peak at 50, check this chart http://t.co/RmiThJDaJm for more info see http://t.co/knFtckioKC", "created_at"=>"2013-06-20T06:53:54Z", "user"=>"GastonHeimeriks", "user_name"=>"Gaston Heimeriks", "user_profile_image"=>"http://a0.twimg.com/profile_images/2548541764/7fz38pr7bm4vzui9iv0h_normal.jpeg"}
• {"id"=>"347841068781404162", "text"=>"RT @cesifoti: Professors peak at 50, check this chart http://t.co/RmiThJDaJm for more info see http://t.co/knFtckioKC", "created_at"=>"2013-06-20T22:19:08Z", "user"=>"Fcorowe", "user_name"=>"Francisco", "user_profile_image"=>"http://a0.twimg.com/sticky/default_profile_images/default_profile_5_normal.png"}
• {"id"=>"349209232878477312", "text"=>"#PLOSONE: The Effects of Aging on Researchers' Publication and Citation Patterns http://t.co/gEFio2w6ji", "created_at"=>"2013-06-24T16:55:43Z", "user"=>"thanec", "user_name"=>"Thane Chambers", "user_profile_image"=>"http://a0.twimg.com/profile_images/90083342/IMG_0128_1_normal.JPG"}

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Figshare

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• {"files"=>["https://ndownloader.figshare.com/files/912629"], "description"=>"<p>Distribution of review articles by professor age A) Average number of reviews (active professors) B) Percentage of reviews.</p>", "links"=>[], "tags"=>["articles", "reviews"], "article_id"=>583091, "categories"=>["Science Policy", "Medicine"], "users"=>["Yves Gingras", "Vincent Larivière", "Benoît Macaluso", "Jean-Pierre Robitaille"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0004048.g006", "stats"=>{"downloads"=>3, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Distribution_of_review_articles_by_professor_age_A_Average_number_of_reviews_active_professors_B_Percentage_of_reviews_/583091", "title"=>"Distribution of review articles by professor age A) Average number of reviews (active professors) B) Percentage of reviews.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-21 07:17:13"}
• {"files"=>["https://ndownloader.figshare.com/files/912393"], "description"=>"<p>A) Average relative impact factor (ARIF) B) Average relative citations (ARC) C) Percentage of papers in the top 10% cited journals D) Percentage of papers in the top 10% cited papers.</p>", "links"=>[], "tags"=>["geriatrics", "science policy", "science policy/education"], "article_id"=>582854, "categories"=>["Science Policy", "Medicine"], "users"=>["Yves Gingras", "Vincent Larivière", "Benoît Macaluso", "Jean-Pierre Robitaille"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0004048.g004", "stats"=>{"downloads"=>3, "page_views"=>15, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Distribution_of_paper_research_impact_by_professor_age_/582854", "title"=>"Distribution of paper research impact by professor age.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-21 07:15:52"}
• {"files"=>["https://ndownloader.figshare.com/files/912704"], "description"=>"<p>A) Average professor position and Average position divided by average number of authors per article. Papers with more than 10 authors were removed from this sample. B) Number of first-authored papers (active professors).</p>", "links"=>[], "tags"=>["co-authors", "papers"], "article_id"=>583166, "categories"=>["Science Policy", "Medicine"], "users"=>["Yves Gingras", "Vincent Larivière", "Benoît Macaluso", "Jean-Pierre Robitaille"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0004048.g007", "stats"=>{"downloads"=>10, "page_views"=>14, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Average_position_of_co_authors_in_papers_by_professor_age_/583166", "title"=>"Average position of co-authors in papers by professor age.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-21 07:17:34"}
• {"files"=>["https://ndownloader.figshare.com/files/912526"], "description"=>"<p>A) Average annual number of papers per professor in the top 10% cited journals (<i>all professors</i>) B) Average annual number of papers per professor in the top 10% cited papers (<i>all professors</i>) C) Average annual number of papers per professor in the top 10% cited journals (<i>active professors</i>) D) Average annual number of papers per professor in the top 10% cited papers (<i>active professors</i>).</p>", "links"=>[], "tags"=>["highest", "papers"], "article_id"=>582995, "categories"=>["Science Policy", "Medicine"], "users"=>["Yves Gingras", "Vincent Larivière", "Benoît Macaluso", "Jean-Pierre Robitaille"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0004048.g005", "stats"=>{"downloads"=>1, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Distribution_of_highest_impact_papers_by_professor_age_/582995", "title"=>"Distribution of highest impact papers by professor age.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-21 07:16:40"}
• {"files"=>["https://ndownloader.figshare.com/files/912327"], "description"=>"<p>Distribution of age of cited references and percentage of those references that are 5 years or younger (Price Index for references of 100 years old or less).</p>", "links"=>[], "tags"=>["cited", "references", "years", "younger", "100"], "article_id"=>582790, "categories"=>["Science Policy", "Medicine"], "users"=>["Yves Gingras", "Vincent Larivière", "Benoît Macaluso", "Jean-Pierre Robitaille"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0004048.g003", "stats"=>{"downloads"=>3, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Distribution_of_age_of_cited_references_and_percentage_of_those_references_that_are_5_years_or_younger_Price_Index_for_references_of_100_years_old_or_less_/582790", "title"=>"Distribution of age of cited references and percentage of those references that are 5 years or younger (Price Index for references of 100 years old or less).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-21 07:15:30"}
• {"files"=>["https://ndownloader.figshare.com/files/912194"], "description"=>"<p>A) Number of professors (all professors and active professors) B) Percentage of professors who published at least one paper (active professors).</p>", "links"=>[], "tags"=>["professors"], "article_id"=>582655, "categories"=>["Science Policy", "Medicine"], "users"=>["Yves Gingras", "Vincent Larivière", "Benoît Macaluso", "Jean-Pierre Robitaille"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0004048.g001", "stats"=>{"downloads"=>0, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Distribution_of_professors_by_age_/582655", "title"=>"Distribution of professors by age.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-21 07:14:44"}

PMC Usage Stats | Further Information

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Relative Metric

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F1000Prime