A5086600904- Reading and Literacy Development
- Child Development and Digital Technology
- Language Development and Disorders
- Cognitive and developmental aspects of mathematical skills
- Attention Deficit Hyperactivity Disorder
- Genetics and Neurodevelopmental Disorders
- Cognitive Abilities and Testing
- Writing and Handwriting Education
- Neurobiology of Language and Bilingualism
- Hearing Impairment and Communication
- Parental Involvement in Education
- Agricultural Economics and Policy
- Visual perception and processing mechanisms
- Plant Water Relations and Carbon Dynamics
- Neural and Behavioral Psychology Studies
- Children's Physical and Motor Development
- Child and Adolescent Psychosocial and Emotional Development
- Early Childhood Education and Development
- Autism Spectrum Disorder Research
- Color perception and design
- Agricultural Innovations and Practices
- Spatial Cognition and Navigation
- Second Language Acquisition and Learning
- Text Readability and Simplification
- Educational and Psychological Assessments
University of Colorado Boulder
2015-2024
University of Colorado System
2008-2019
Linköping University
2011-2019
Institute for Behavioral Medicine
1991-2019
University of Colorado Denver
2006
W. M. Keck Foundation
2005
Yale University
2005
University of Nebraska Medical Center
2005
Centre for Human Genetics
2002
University of Oxford
2002
Comprehension tests are often used interchangeably, suggesting an implicit assumption that they all measuring the same thing. We examine validity of this by comparing some most popular reading comprehension measures in research and clinical practice United States: Gray Oral Reading Test (GORT), two assessments (retellings questions) from Qualitative Inventory (QRI), Woodcock–Johnson Passage subtest (WJPC), test Peabody Individual Achievement (PIAT). Modest intercorrelations among suggested...
Abstract Measures of component reading and language skills, executive functions, processing speed were administered to groups children with attention deficit hyperactivity disorder (ADHD; n = 113), disability (RD; 109), both RD ADHD (n 64), neither nor 151). Groups exhibited pronounced deficits on all measures as well significant weaknesses verbal working memory, speed, response inhibition. response-inhibition tasks impaired some skills memory. The group comorbid the combination in RD-only...
Phonological coding, measured by the oral reading of nonwords, and orthographic discrimination words from homophonic nonwords (e.g., rane, rain), were compared for pairs older children with disabilities (RD) younger nondisabled readers matched on word recognition. coding was substantially lower most RD, indicating a unique developmental deficit in phonological rather than an equal lag across all component skills. Data identical fraternal twins indicated that RD highly heritable accounted...
This study used a nonreferred sample of twins to contrast the performance individuals with reading disability (RD; n = 93), attention-deficit/hyperactivity disorder (ADHD; 52), RD and ADHD (n 48), neither nor 121) on measures phoneme awareness (PA) executive functioning (EF). Exploratory factor analysis EF yielded underlying factors working memory, inhibition, set shifting. Results revealed that was associated inhibition deficits, whereas significant deficits PA verbal memory. The + group...
DYX2 on 6p22 is the most replicated reading disability (RD) locus. By saturating a previously identified peak of association with single nucleotide polymorphism markers, we large polymorphic deletion that encodes tandem repeats putative brain-related transcription factor binding sites in intron 2 DCDC2 . Alleles this compound repeat are significant disequilibrium multiple traits. RT-PCR data show localizes to regions brain where fluent occurs, and RNA interference studies down-regulation...
Certain psychophysical continua have a primarily morphophoric function: they are the media in which patterns occur. The appropriate scale for any such medium is one that reflects invariances preserved transposition behavior. results of two experiments designed to pitch by methods lead conclusion musical scale, not mel describes function pitch. However, an abrupt breaking point evident at about 5,000 Hz, above behavior erratic.
Subalpine forests of the northern Appalachians are subject to significant deposition water and chemicals via cloud droplet impaction. This has been estimated by a method linking micrometeorological measures turbulent transfer, detailed representation canopy structure, experimentally derived capture efficiencies. Water inputs from clouds about 46 percent, chemical range 150 430 percent bulk precipitation.
Reading disability (RD) and math (MD) frequently co-occur, but the etiology of this comorbidity is not well understood. Groups with RD only (N = 241), MD 183), + 188) a control group neither disorder 411) completed battery measures internalizing externalizing psychopathology, social academic functioning, 10 neuropsychological processes. only, were significantly impaired versus on nearly all measures, was more than groups alone 7 constructs. Multiple regression analyses indicated that...
The present study explored whether different executive control and speed measures (working memory, inhibition, processing speed, naming speed) independently predict individual differences in word reading comprehension. Although previous studies suggest these cognitive constructs are important for reading, the authors analyze simultaneously to test each is a unique predictor. Latent variables from 483 participants (ages 8-16 years) were used portion construct into its shared variance. In...
Males show higher rates of attention deficit hyperactivity disorder (ADHD) than do females. Potential explanations include genuine etiological differences or artifact.2,332 twin and sibling youth participated in behavioral cognitive testing. Partially competing models symptom severity distribution differences, the mean difference, variance difference models, were tested within a randomly selected subsample. The Delta method was used to test for mediation sex ADHD by processing speed,...
Background: This study tests a multiple cognitive deficit model of reading disability (RD), attention-deficit/hyperactivity disorder (ADHD), and their comorbidity. Methods: A structural equation (SEM) risk factors symptom outcome variables was constructed. The included phonological awareness as unique predictor RD response inhibition ADHD. Processing speed, naming verbal working memory were modeled potential shared deficits. Results: Model fit indices from the SEM indicated satisfactory fit....
The overall goals of this study were to test single versus multiple cognitive deficit models dyslexia (reading disability) at the level individual cases and determine clinical utility these for prediction diagnosis dyslexia. To accomplish goals, we tested five dyslexia--two single-deficit models, two multiple-deficit one hybrid model--in large population-based samples, cross-sectional (Colorado Learning Disability Research Center) longitudinal (International Twin Study). deficits included in...
The use of spoken and written language is a fundamental human capacity. Individual differences in reading- language-related skills are influenced by genetic variation, with twin-based heritability estimates 30 to 80% depending on the trait. architecture complex, heterogeneous, multifactorial, but investigations contributions single-nucleotide polymorphisms (SNPs) were thus far underpowered. We present multicohort genome-wide association study (GWAS) five traits assessed individually using...