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Direct linkWillcutt, Erik G.; Petrill, Stephen A. – Mind, Brain, and Education, 2023
To better understand the implications of comorbidity between reading disability (RD) and attention-deficit/hyperactivity disorder (ADHD), a sample of 225 participants with RD but without ADHD, 139 participants with both RD and ADHD, and 1,502 children without reading or attentional difficulties was recruited through five large public school…
Descriptors: Reading Difficulties, Attention Deficit Hyperactivity Disorder, Comorbidity, Comparative Analysis
Child, Amanda E.; Cirino, Paul T.; Fletcher, Jack M.; Willcutt, Erik G.; Fuchs, Lynn S. – Journal of Learning Disabilities, 2019
Disorders of reading, math, and attention frequently co-occur in children. However, it is not yet clear which cognitive factors contribute to comorbidities among multiple disorders and which uniquely relate to one, especially because they have rarely been studied as a triad. Thus, the present study considers how reading, math, and attention relate…
Descriptors: Attention, Short Term Memory, Predictor Variables, Phonological Awareness
Willcutt, Erik G.; McGrath, Lauren M.; Pennington, Bruce F.; Keenan, Janice M.; DeFries, John C.; Olson, Richard K.; Wadsworth, Sally J. – New Directions for Child and Adolescent Development, 2019
Current definitions of specific learning disability (SLD) identify a heterogeneous population that includes individuals with weaknesses in reading, math, or writing, and these academic difficulties often co-occur in many of the same individuals. The Colorado Learning Disabilities Research Center (CLDRC) is an interdisciplinary, multisite research…
Descriptors: Comorbidity, Learning Disabilities, Twins, Reading Difficulties
Arnett, Anne B.; Pennington, Bruce F.; Peterson, Robin L.; Willcutt, Erik G.; DeFries, John C.; Olson, Richard K. – Journal of Child Psychology and Psychiatry, 2017
Background: Males are diagnosed with dyslexia more frequently than females, even in epidemiological samples. This may be explained by greater variance in males' reading performance. Methods: We expand on previous research by rigorously testing the variance difference theory, and testing for mediation of the sex difference by cognitive correlates.…
Descriptors: Dyslexia, Gender Differences, Reading Difficulties, Cognitive Processes
Brodsky, Kimberly; Willcutt, Erik G.; Davalos, Deana B.; Ross, Randal G. – Journal of Child Psychology and Psychiatry, 2014
Background: Attention-deficit/hyperactivity disorder (ADHD) and childhood-onset psychosis (COP) are chronic, heterogeneous disorders with symptoms that frequently co-occur, but the etiology of their comorbidity is unknown. Studies of each disorder indicate that both ADHD and COP are associated with a range of neuropsychological weaknesses, but few…
Descriptors: Attention Deficit Hyperactivity Disorder, Mental Disorders, Psychosis, Psychiatry
Boada, Richard; Willcutt, Erik G.; Pennington, Bruce F. – Topics in Language Disorders, 2012
Dyslexia and attention-deficit/hyperactivity disorder (ADHD) are 2 of the most prevalent complex neurodevelopmental disorders of childhood, each affecting approximately 5% of the population in the United States. These disorders are also each comorbid with speech sound disorder and language impairment. Understanding the nature of the comorbidity…
Descriptors: Attention Deficit Hyperactivity Disorder, Dyslexia, Children, Comorbidity
Wu, Sarah S.; Willcutt, Erik G.; Escovar, Emily; Menon, Vinod – Journal of Learning Disabilities, 2014
Although behavioral difficulties are well documented in reading disabilities, little is known about the relationship between math ability and internalizing and externalizing behaviors. Here, we use standardized measures to investigate the relation among early math ability, math anxiety, and internalizing and externalizing behaviors in a group of…
Descriptors: Mathematics Achievement, Anxiety, Behavior Problems, Correlation
Willcutt, Erik G.; Petrill, Stephen A.; Wu, Sarah; Boada, Richard; DeFries, John C.; Olson, Richard K.; Pennington, Bruce F. – Journal of Learning Disabilities, 2013
Reading disability (RD) and math disability (MD) frequently co-occur, but the etiology of this comorbidity is not well understood. Groups with RD only (N = 241), MD only (N = 183), and RD + MD (N = 188) and a control group with neither disorder (N = 411) completed a battery of measures of internalizing and externalizing psychopathology, social and…
Descriptors: Comorbidity, Reading Difficulties, Behavior Disorders, Psychopathology
