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Intelligence Trajectories in Adolescents and Adults with Down Syndrome: Cognitively Stimulating Leisure Activities Mitigate Health and ADL Problems
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Lifshit, Hefziba Batya; Bustan, Noa; Shnitzer-Meirovich, Shlomit – Journal of Applied Research in Intellectual Disabilities, 2021
Goals: This study examined: (a) crystallized/fluid intelligence trajectories of adolescents and adults with Down syndrome; and (b) the contribution of endogenous (health, activities of daily living--ADL) and exogenous (cognitively stimulating leisure activities) factors on adults' intelligence with age. Method: Four cohorts (N = 80) with Down…
Descriptors: Down Syndrome, Adolescents, Adults, Health Behavior
Have Standard Formulas Correcting Correlations for Range Restriction Been Adequately Tested?: Minor Sampling Distribution Quirks Distort Them
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Johnson, Wendy; Deary, Ian J.; Bouchard, Thomas J., Jr. – Educational and Psychological Measurement, 2018
Most study samples show less variability in key variables than do their source populations due most often to indirect selection into study participation associated with a wide range of personal and circumstantial characteristics. Formulas exist to correct the distortions of population-level correlations created. Formula accuracy has been tested…
Descriptors: Correlation, Sampling, Statistical Distributions, Accuracy
Self and Informant Reports of Mental Health Difficulties among Adults with Autism Findings from a Long-Term Follow-Up Study
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Moss, Philippa; Howlin, Patricia; Savage, Sarah; Bolton, Patrick; Rutter, Michael – Autism: The International Journal of Research and Practice, 2015
Data on psychiatric problems in adults with autism are inconsistent, with estimated rates ranging from around 25% to over 75%. We assessed difficulties related to mental health in 58 adults with autism (10 females, 48 males; mean age 44?years) whom we have followed over four decades. All were of average non-verbal intelligence quotient when…
Descriptors: Autism, Mental Disorders, Symptoms (Individual Disorders), Adults
Relationship between Level I and Level II Abilities and Problem Solving.
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Schroth, Marvin L. – Perceptual and Motor Skills, 1982
This study investigated the relationship between Jensen's Level I-Level II mental abilities and how they correlate with problem solving in college students. The Level I-Level II correlation was not significant, but intelligence and problem solving were significantly correlated. Results are discussed in relation to prior findings. (Author/RD)
Descriptors: Cognitive Ability, Correlation, Higher Education, Intelligence
The Advanced Raven's Progressive Matrices: Normative Data for an American University Population and an Examination of the Relationship with Spearman's g.
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Paul, Steven M. – Journal of Experimental Education, 1986
Normative data for the Advanced Raven's Progressive Matrices are presented based on 300 University of California, Berkeley, students. Correlations with the Wechsler Adult Intelligence Scale and the Terman Concept Mastery Test are explored. The relationship between the Advanced Raven's Progressive Matrices and Spearman's g is explored. (Author)
Descriptors: Aptitude Tests, Cognitive Measurement, Comparative Testing, Correlation
Speed of Information Processing and General Intelligence.
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Vernon, Philip A. – Intelligence, 1983
This study investigated the relationship between measures of speed of cognitive information processing and intelligence test scores. Cognitive processing measures were significantly related to IQ scores. Reaction time tests measure cognitive operations basic to intelligence, and individual differences in intelligence are partly due to variability…
Descriptors: Cognitive Processes, Correlation, Factor Analysis, Higher Education