Do Seasons Have an Influence on the Incidence of Depression? The Use of an Internet Search Engine Query Data as a Proxy of Human Affect
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{"title"=>"Do seasons have an influence on the incidence of depression? the use of an internet search engine query data as a proxy of human affect", "type"=>"journal", "authors"=>[{"first_name"=>"Albert C.", "last_name"=>"Yang", "scopus_author_id"=>"7203072314"}, {"first_name"=>"Norden E.", "last_name"=>"Huang", "scopus_author_id"=>"24434036000"}, {"first_name"=>"Chung Kang", "last_name"=>"Peng", "scopus_author_id"=>"7401797804"}, {"first_name"=>"Shih Jen", "last_name"=>"Tsai", "scopus_author_id"=>"7403478452"}], "year"=>2010, "source"=>"PLoS ONE", "identifiers"=>{"pmid"=>"21060851", "doi"=>"10.1371/journal.pone.0013728", "issn"=>"19326203", "pui"=>"359931356", "isbn"=>"1932-6203 (Electronic)\\r1932-6203 (Linking)", "sgr"=>"78149463984", "scopus"=>"2-s2.0-78149463984"}, "id"=>"16efd1e5-c4e7-3610-aef5-87f63281f5ae", "abstract"=>"Background: Seasonal depression has generated considerable clinical interest in recent years. Despite a common belief that\\r\\npeople in higher latitudes are more vulnerable to low mood during the winter, it has never been demonstrated that\\r\\nhuman’s moods are subject to seasonal change on a global scale. The aim of this study was to investigate large-scale\\r\\nseasonal patterns of depression using Internet search query data as a signature and proxy of human affect.\\r\\nMethodology/Principal Findings: Our study was based on a publicly available search engine database, Google Insights for\\r\\nSearch, which provides time series data of weekly search trends from January 1, 2004 to June 30, 2009. We applied an\\r\\nempirical mode decomposition method to isolate seasonal components of health-related search trends of depression in 54\\r\\ngeographic areas worldwide. We identified a seasonal trend of depression that was opposite between the northern and\\r\\nsouthern hemispheres; this trend was significantly correlated with seasonal oscillations of temperature (USA: r = 20.872,\\r\\np,0.001; Australia: r = 20.656, p,0.001). Based on analyses of search trends over 54 geological locations worldwide, we\\r\\nfound that the degree of correlation between searching for depression and temperature was latitude-dependent (northern\\r\\nhemisphere: r = 20.686; p,0.001; southern hemisphere: r = 0.871; p,0.0001).\\r\\nConclusions/Significance: Our findings indicate that Internet searches for depression from people in higher latitudes are\\r\\nmore vulnerable to seasonal change, whereas this phenomenon is obscured in tropical areas. This phenomenon exists\\r\\nuniversally across countries, regardless of language. This study provides novel, Internet-based evidence for the\\r\\nepidemiology of seasonal depression.", "link"=>"http://www.mendeley.com/research/seasons-influence-incidence-depression-internet-search-engine-query-data-proxy-human-affect", "reader_count"=>70, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>4, "Researcher"=>29, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>2, "Student > Master"=>8, "Other"=>3, "Student > Bachelor"=>5, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>2, "Professor"=>4}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>4, "Researcher"=>29, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>2, "Student > Master"=>8, "Other"=>3, "Student > Bachelor"=>5, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>2, "Professor"=>4}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Agricultural and Biological Sciences"=>8, "Arts and Humanities"=>1, "Chemistry"=>1, "Computer Science"=>7, "Earth and Planetary Sciences"=>1, "Economics, Econometrics and Finance"=>3, "Environmental Science"=>1, "Mathematics"=>2, "Medicine and Dentistry"=>10, "Neuroscience"=>3, "Pharmacology, Toxicology and Pharmaceutical Science"=>1, "Physics and Astronomy"=>1, "Psychology"=>21, "Social Sciences"=>6, "Engineering"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>10}, "Social Sciences"=>{"Social Sciences"=>6}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Psychology"=>{"Psychology"=>21}, "Mathematics"=>{"Mathematics"=>2}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>1}, "Pharmacology, Toxicology and Pharmaceutical Science"=>{"Pharmacology, Toxicology and Pharmaceutical Science"=>1}, "Arts and Humanities"=>{"Arts and Humanities"=>1}, "Engineering"=>{"Engineering"=>1}, "Chemistry"=>{"Chemistry"=>1}, "Neuroscience"=>{"Neuroscience"=>3}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>1}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>3}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>8}, "Computer Science"=>{"Computer Science"=>7}}, "reader_count_by_country"=>{"Netherlands"=>1, "Belgium"=>1, "United States"=>3, "France"=>4}, "group_count"=>3}

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  • {"files"=>["https://ndownloader.figshare.com/files/821696"], "description"=>"<p>A) Time series of weekly normalized search interests of health-related queries for depression in the United States from 2004–2009 (287 data points). B) Time series of first IMF, which is a component of noise by statistical test. C) Time series of seasonal IMF. D) Residual component (overall trend). The seasonal IMF is the most energetic components in these data.</p>", "links"=>[], "tags"=>["decomposition", "emd"], "article_id"=>492064, "categories"=>["Mathematics", "Mental Health", "Cancer"], "users"=>["Albert C. Yang", "Norden E. Huang", "Chung-Kang Peng", "Shih-Jen Tsai"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0013728.g001", "stats"=>{"downloads"=>0, "page_views"=>27, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Examples_of_decomposition_using_the_EMD_method_/492064", "title"=>"Examples of decomposition using the EMD method:", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-10-28 00:34:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/821750"], "description"=>"<p>Comparison of raw data between search trend of depression (blue line) and temperature (red line) in the northern hemisphere (United States of America) and the southern hemisphere (Australia).</p>", "links"=>[], "tags"=>["hemisphere", "states"], "article_id"=>492121, "categories"=>["Mathematics", "Mental Health", "Cancer"], "users"=>["Albert C. Yang", "Norden E. Huang", "Chung-Kang Peng", "Shih-Jen Tsai"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0013728.g002", "stats"=>{"downloads"=>1, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparison_of_raw_data_between_search_trend_of_depression_blue_line_and_temperature_red_line_in_the_northern_hemisphere_United_States_of_America_and_the_southern_hemisphere_Australia_/492121", "title"=>"Comparison of raw data between search trend of depression (blue line) and temperature (red line) in the northern hemisphere (United States of America) and the southern hemisphere (Australia).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-10-28 00:35:21"}
  • {"files"=>["https://ndownloader.figshare.com/files/821887"], "description"=>"<p>Comparisons are made between seasonal IMF of search trends, temperature and solar radiation. Each data point represents a geographic area and is categorized by its respective continent/land. For the coordinate of the data point, each geographic location's latitude is the x-coordinate, and the y-coordinate is the cross-correlation coefficient between its seasonal IMF of local search trend and that of (a) temperature as well as (b) solar radiation.</p>", "links"=>[], "tags"=>["seasonality", "internet", "geographic"], "article_id"=>492258, "categories"=>["Mathematics", "Mental Health", "Cancer"], "users"=>["Albert C. Yang", "Norden E. Huang", "Chung-Kang Peng", "Shih-Jen Tsai"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0013728.g004", "stats"=>{"downloads"=>3, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_The_relationship_between_seasonality_of_Internet_search_trend_of_depression_and_geographic_locations_/492258", "title"=>"The relationship between seasonality of Internet search trend of depression and geographic locations.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-10-28 00:37:38"}
  • {"files"=>["https://ndownloader.figshare.com/files/409487", "https://ndownloader.figshare.com/files/409529", "https://ndownloader.figshare.com/files/409562", "https://ndownloader.figshare.com/files/409598", "https://ndownloader.figshare.com/files/409654", "https://ndownloader.figshare.com/files/409677"], "description"=>"<div><h3>Background</h3><p>Seasonal depression has generated considerable clinical interest in recent years. Despite a common belief that people in higher latitudes are more vulnerable to low mood during the winter, it has never been demonstrated that human's moods are subject to seasonal change on a global scale. The aim of this study was to investigate large-scale seasonal patterns of depression using Internet search query data as a signature and proxy of human affect.</p><h3>Methodology/Principal Findings</h3><p>Our study was based on a publicly available search engine database, Google Insights for Search, which provides time series data of weekly search trends from January 1, 2004 to June 30, 2009. We applied an empirical mode decomposition method to isolate seasonal components of health-related search trends of depression in 54 geographic areas worldwide. We identified a seasonal trend of depression that was opposite between the northern and southern hemispheres; this trend was significantly correlated with seasonal oscillations of temperature (USA: r = −0.872, p<0.001; Australia: r = −0.656, p<0.001). Based on analyses of search trends over 54 geological locations worldwide, we found that the degree of correlation between searching for depression and temperature was latitude-dependent (northern hemisphere: r = −0.686; p<0.001; southern hemisphere: r = 0.871; p<0.0001).</p><h3>Conclusions/Significance</h3><p>Our findings indicate that Internet searches for depression from people in higher latitudes are more vulnerable to seasonal change, whereas this phenomenon is obscured in tropical areas. This phenomenon exists universally across countries, regardless of language. This study provides novel, Internet-based evidence for the epidemiology of seasonal depression.</p></div>", "links"=>[], "tags"=>["seasons", "incidence", "internet", "query", "proxy"], "article_id"=>140883, "categories"=>["Mathematics", "Mental Health", "Cancer"], "users"=>["Albert C. Yang", "Norden E. Huang", "Chung-Kang Peng", "Shih-Jen Tsai"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0013728.s001", "https://dx.doi.org/10.1371/journal.pone.0013728.s002", "https://dx.doi.org/10.1371/journal.pone.0013728.s003", "https://dx.doi.org/10.1371/journal.pone.0013728.s004", "https://dx.doi.org/10.1371/journal.pone.0013728.s005", "https://dx.doi.org/10.1371/journal.pone.0013728.s006"], "stats"=>{"downloads"=>14, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Do_Seasons_Have_an_Influence_on_the_Incidence_of_Depression_The_Use_of_an_Internet_Search_Engine_Query_Data_as_a_Proxy_of_Human_Affect/140883", "title"=>"Do Seasons Have an Influence on the Incidence of Depression? The Use of an Internet Search Engine Query Data as a Proxy of Human Affect", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2010-10-28 00:14:43"}
  • {"files"=>["https://ndownloader.figshare.com/files/821821"], "description"=>"<p>Comparison of decomposed seasonal IMF between search trend of health-related queries for depression (blue line) and temperature (red line) in the northern hemisphere (United States of America) and the southern hemisphere (Australia).</p>", "links"=>[], "tags"=>["decomposed", "seasonal", "imf", "health-related", "queries", "hemisphere", "states"], "article_id"=>492188, "categories"=>["Mathematics", "Mental Health", "Cancer"], "users"=>["Albert C. Yang", "Norden E. Huang", "Chung-Kang Peng", "Shih-Jen Tsai"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0013728.g003", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparison_of_decomposed_seasonal_IMF_between_search_trend_of_health_related_queries_for_depression_blue_line_and_temperature_red_line_in_the_northern_hemisphere_United_States_of_America_and_the_southern_hemisphere_Australia_/492188", "title"=>"Comparison of decomposed seasonal IMF between search trend of health-related queries for depression (blue line) and temperature (red line) in the northern hemisphere (United States of America) and the southern hemisphere (Australia).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-10-28 00:36:28"}

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Relative Metric

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