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All completed Vocabulary and Similarities (crystallized) and Block Design and Raven (fluid) intelligence tests (WAIS\u2010III\n                      <jats:sup>HEB<\/jats:sup>\n                      , Wechsler, 2001).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The 30\u201345 cohort significantly outperformed the 16\u201321 cohort. Except for Vocabulary, which remained stable, onset of decline was at 40\u201350. Age\u2010related declining health and ADL correlated with participants\u2019 lower fluid intelligence, but cognitive leisure activities mitigated this influence.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Intelligence development into adulthood supported the continuous trajectory and compensation age theory, rather than accelerated or stable trajectories. Not only endogenous factors but also exogenous factors determined intelligence levels in adults with Down syndrome, supporting cognitive activity theory.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jar.12813","type":"journal-article","created":{"date-parts":[[2020,10,14]],"date-time":"2020-10-14T21:55:49Z","timestamp":1602712549000},"page":"491-506","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Intelligence trajectories in adolescents and adults with down syndrome: Cognitively stimulating leisure activities mitigate health and ADL problems"],"prefix":"10.1111","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4185-3945","authenticated-orcid":false,"given":"Hefziba Batya","family":"Lifshitz","sequence":"first","affiliation":[{"name":"Special Education Department Machado Chair for Research on Cognitive Modifiability and Human Development School of Education Bar\u2010Ilan University Ramat Gan Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noa","family":"Bustan","sequence":"additional","affiliation":[{"name":"Kibbutzim\u2010Seminar College Tel\u2010Aviv Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shlomit","family":"Shnitzer\u2010Meirovich","sequence":"additional","affiliation":[{"name":"Bar\u2010Ilan University Ramat Gan Israel"},{"name":"Lewinsky College Tel\u2010Aviv Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,10,14]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1179\/2047387715Y.0000000014"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijchp.2016.07.002"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1176\/appi.books.9780890425596"},{"key":"e_1_2_6_5_1","volume-title":"A taxonomy for learning, teaching, and assessing: A revision of Bloom's taxonomy of educational objectives","author":"Anderson L.W.","year":"2001"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1001\/jamaneurol.2018.2210"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2788.2011.01531.x"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2788.2005.00735.x"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/jar.12438"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1037\/h0059973"},{"key":"e_1_2_6_11_1","volume-title":"Intelligence: Its structure, growth and action","author":"Cattell R.B.","year":"1987"},{"issue":"5","key":"e_1_2_6_12_1","first-page":"104","article-title":"Crystallized and fluid intelligence of adolescents and adults with intellectual disability and with typical development: Impaired, stable or compensatory trajectories?","volume":"2","author":"Chen I.","year":"2017","journal-title":"The Grant Medical Journals \u2010 Psychiatry"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0891-4222(00)00030-5"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1352\/0047-6765(1997)035<0477:LOAWWD>2.0.CO;2"},{"issue":"3","key":"e_1_2_6_15_1","first-page":"173","article-title":"Cognitive changes in the feebleminded","volume":"45","author":"Clarke A.D.B.","year":"1954","journal-title":"British Journal of Psychology"},{"key":"e_1_2_6_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.2044-8295.1958.tb00650.x"},{"key":"e_1_2_6_17_1","first-page":"146","volume-title":"Educating learners with Down syndrome","author":"Clarke B.A.","year":"2014"},{"key":"e_1_2_6_18_1","doi-asserted-by":"publisher","DOI":"10.3389\/fpsyg.2015.00704"},{"key":"e_1_2_6_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dcn.2010.12.001"},{"key":"e_1_2_6_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/0891-4222(94)00032-5"},{"key":"e_1_2_6_21_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajmg.a.61004"},{"key":"e_1_2_6_22_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2788.1992.tb00511.x"},{"key":"e_1_2_6_23_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2788.2000.00305.x"},{"key":"e_1_2_6_24_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2788.1996.tb00624.x"},{"key":"e_1_2_6_25_1","volume-title":"The British Picture Vocabulary Scale","author":"Dunn L.M.","year":"1982"},{"key":"e_1_2_6_26_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2788.1997.tb00672.x"},{"key":"e_1_2_6_27_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ridd.2006.10.003"},{"key":"e_1_2_6_28_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0074-7750(08)60024-5"},{"key":"e_1_2_6_29_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(20)30689-9"},{"issue":"33","key":"e_1_2_6_30_1","first-page":"23","article-title":"A study of social intelligence & academic achievement of college students of District Srinagar, J&K","volume":"1111","author":"Ganaie M.Y.","year":"2015","journal-title":"India. 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