Brittany M. Merrill

Brittany M. Merrill

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Brittany M. Merrill


Research Focus & Metrics

Academic Career Length

11Years (2016-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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8 July 2021 in Review of Educational Research
Verified
Journal Article
Closed access
GFGregory A. Fabiano
Gregory A. Fabiano
NSNicole K. Schatz
Nicole K. Schatz
AAAriel M. Aloe
Ariel M. Aloe
WPWilliam E. Pelham
William E. Pelham
ASAlyssa C. Smyth
Alyssa C. Smyth
SCStefany Coxe
Stefany Coxe
Interventions for attention-deficit/hyperactivity disorder (ADHD) include positive behavior supports (e.g., parent training, school-based contingency management, behavioral peer interventions), training interventions (e.g., organizational skills training, social skills training, etc.), and other interventions (e.g., academic accommodations/modifications, self-monitoring). There is a need to conduct a comprehensive meta-analysis of psychosocial treatments for ADHD given discrepancies between meta-analyses. The present meta-analysis reports the results of between-group studies that compared a psychosocial treatment to a control condition from 1968 to 2016. In total, 226 studies were identified that met inclusion criteria. Results of the meta-analysis were organized by treatment type, rater, and domain of outcome assessed. Results indicated considerable variability across these parameters, with the strongest effects for proximal outcomes of behavioral parent training (improvements in parenting behaviors yielded a standardized mean difference of 0.70) and improvements in child behavior following implementation of behavioral school intervention (standardized mean difference of 0.66 and 0.72 for teacher ratings of ADHD symptoms and impairment, respectively). Other interventions were not extensively studied as stand-alone approaches. Results are discussed in light of current support for the use of psychosocial interventions for individuals with ADHD.

28 January 2019 in Journal of Clinical Child & Adolescent Psychology
Verified
Journal Article
Closed access
BMBrittany M. Merrill
Brittany M. Merrill
BMBrooke S. G. Molina
Brooke S. G. Molina
SCStefany Coxe
Stefany Coxe
EGElizabeth M. Gnagy
Elizabeth M. Gnagy
AAAmy R. Altszuler
Amy R. Altszuler
WPWilliam E. Pelham
William E. Pelham
Adults with childhood attention-deficit hyperactivity disorder (ADHD) experience impairment in core functional domains (e.g., educational attainment, occupational status, social relationships, substance abuse, and criminal behavior), but it is currently unclear which impairments co-occur and whether subgroups experience differentiable patterns, none, or all aforementioned functional domains. Latent profile analysis (LPA) was used to characterize patterns of impairment. Data from the Pittsburgh ADHD Longitudinal Study were used. The 317 participants were 25 years old and had childhood ADHD. LPA characterized the variability across substance use (alcohol consumption, cigarette smoking, marijuana use), criminal behavior, peer impairment, educational attainment, maternal relationship, financial dependence, and sexual activity among young adults with childhood ADHD. Childhood predictors of profiles were examined, and ADHD profiles were compared to a matched comparison group without ADHD also followed longitudinally (n = 217). Five profiles were found: prototypic impairment group (54%), high binge-drinking group (17%), high marijuana use group (10%), high criminal activity group (3%), and high cross-domain impairment group (17%). All profiles were impaired compared to non-ADHD young adults. Childhood variables rarely significantly predicted profiles. Young adults with childhood ADHD have differentiable impairment patterns that vary based on substance use, criminal behavior, and number of clinically impaired domains. Nearly all young adult ADHD profiles were impaired in peer, educational, and financial domains, and there was not a nonimpaired ADHD profile. Use of specific substances was elevated among subgroups of, but not all, young adults with ADHD histories. Finally, the high cross-domain impairment profile was impaired in all domains.

1 February 2017 in Journal of Consulting and Clinical Psychology
Verified
Journal Article
Open access
BMBrittany M. Merrill
Brittany M. Merrill
AMAnne S. Morrow
Anne S. Morrow
AAAmy R. Altszuler
Amy R. Altszuler
FMFiona L. Macphee
Fiona L. Macphee
EGElizabeth M. Gnagy
Elizabeth M. Gnagy
WPWilliam E. Pelham
William E. Pelham
Evidence indicates that children with Attention Deficit Hyperactivity Disorder (ADHD) experience acute and prolonged academic impairment and underachievement including marked difficulty with completing homework. This study is the first to examine the effects of behavioral, psychostimulant, and combined treatments on homework problems, which have been shown to predict academic performance longitudinally. Children with ADHD (ages 5-12, N = 75, 71% male, 83% Hispanic/Latino) and their families were randomly assigned to either behavioral treatment (homework-focused parent training and a daily report card; BPT + DRC) or a waitlist control group. Children also participated in a concurrent psychostimulant crossover trial conducted in a summer treatment program. Children's objective homework completion and accuracy were measured as well as parent-reported child homework behaviors and parenting skills. BPT + DRC had large effects on objective measures of homework completion and accuracy (Cohen's ds from 1.40 to 2.21, ps < .001). Other findings, including unimodal medication and incremental combined treatment benefits, were not significant. Behavioral treatment focused on homework problems results in clear benefits for children's homework completion and accuracy (the difference between passing and failing, on average), whereas long-acting stimulant medication resulted in limited and largely nonsignificant acute effects on homework performance. (PsycINFO Database Record

1 May 2022 in Journal of Consulting and Clinical Psychology
Verified
Journal Article
Closed access
WPWilliam E. Pelham
William E. Pelham
AAAmy R. Altszuler
Amy R. Altszuler
BMBrittany M. Merrill
Brittany M. Merrill
JRJoseph S. Raiker
Joseph S. Raiker
FMFiona L. Macphee
Fiona L. Macphee
JWJames G. Waxmonsky
James G. Waxmonsky
Evaluate whether stimulant medication improves acquisition of academic material in children with ADHD receiving small-group, content-area instruction in a classroom setting. Participants were 173 children between the ages of 7 and 12 (77% male, 86% Hispanic) who met DSM −5 criteria for ADHD and were participating in a therapeutic summer camp. The design was a triple-masked, within-subject, AB/BA crossover trial. Children completed two consecutive phases of daily, 25-minute instruction in both (a) subject-area content (science, social studies) and (b) vocabulary. Each phase was a standard instructional unit lasting for 3 weeks. Teachers and aides taught the material to small groups in a summer classroom setting. Each child was randomized to be medicated with daily osmotic-release oral system methylphenidate (OROS-MPH) during either the first or second of the instructional phases, receiving placebo during the other. Medication had large, salutary, statistically significant effects on children’s academic seatwork productivity and classroom behavior on every single day of the instructional period. However, there was no detectable effect of medication on learning the material taught during instruction: children learned the same amount of subject-area and vocabulary content whether they were taking OROS-MPH or placebo during the instructional period. Acute effects of OROS-MPH on daily academic seatwork productivity and classroom behavior did not translate into improved learning of new academic material taught via small-group, evidence-based instruction.

8 July 2022 in Research on Child and Adolescent Psychopathology
Verified
Journal Article
Closed access
PDF file
MRMarcela Ramos
Marcela Ramos
FMFiona L. Macphee
Fiona L. Macphee
BMBrittany M. Merrill
Brittany M. Merrill
AAAmy R. Altszuler
Amy R. Altszuler
JRJoseph S. Raiker
Joseph S. Raiker
WPWilliam E. Pelham
William E. Pelham

1 April 2022 in Experimental and Clinical Psychopharmacology
Verified
Journal Article
Closed access
MCMileini Campez
Mileini Campez
JRJoseph S. Raiker
Joseph S. Raiker
KLKelcey Little
Kelcey Little
AAAmy R. Altszuler
Amy R. Altszuler
BMBrittany M. Merrill
Brittany M. Merrill
WPWilliam E. Pelham
William E. Pelham
Individuals with Attention-Deficit Hyperactivity Disorder (ADHD) consistently exhibit a stronger preference for immediate rewards than for larger rewards available following a delay on tasks measuring choice impulsivity (CI). Despite this, however, there remains a dearth of studies examining the impact of stimulant treatment on CI as well as associated higher order (e.g., working memory [WM]) and perceptual (e.g., time perception) cognitive processes. The present study examines the effect of osmotic release oral system methylphenidate (OROS-MPH) on CI, WM and time perception processes as well as the relation among these processes before and after taking a regimen of OROS-MPH. Thirty-five children (aged 7-12 years) with a diagnosis of ADHD participating in a concurrent stimulant medication study were recruited to complete computerized assessments of CI, WM, and time perception. Children completed the assessments after administration of a placebo as well as their lowest effective dose of OROS-MPH following a 2-week titration period. The results from one-sample t-tests indicated that OROS-MPH improves both CI and WM in youth with ADHD but does not impact time perception. Further, results revealed no significant association among the various indices of cognitive performance while taking placebo or OROS-MPH. Overall, the findings suggest that while OROS-MPH improves both CI and WM in youth with ADHD, improvements in CI as a result of OROS-MPH are unlikely to be associated with the improvements in WM given the lack of association among the two. Future studies should consider alternate cognitive, emotional, and motivational mechanisms that may account for the impact of OROS-MPH on CI. (PsycInfo Database Record (c) 2022 APA, all rights reserved).