The Benefits of Adding a Brief Measure of Simple Reaction Time to The Assessment of Executive Function Skills in Early Childhood

Authors

Michael T. Willoughby, RTI International
Clancy B. Blair, New York University
Laura J. Kuhn, University of North Carolina - Chapel Hill
Brooke E. Magnus, Marquette UniversityFollow

Document Type

Article

Language

eng

Publication Date

6-2018

Publisher

Elsevier

Source Publication

Journal of Experimental Child Psychology

Source ISSN

0022-0965

Abstract

Early childhood represents a period of rapid cognitive developmental change in executive function (EF) skills along with a variety of related cognitive processes, including processing speed. This leads to interpretational challenges in that children’s performance on EF tasks reflects more than EF skills per se. We tested whether the inclusion of a brief measure of simple reaction time (SRT) during EF assessments could help to partially address this challenge. Data were drawn from a cross-sectional convenience sample of 830 preschool-aged children. Individual differences in SRT were significantly associated with performance on all tasks (R²s = .09–.26); slower performance on the SRT task was associated with poorer performance on each EF task. Age-related differences in individual EF tasks were reduced by approximately one half after accounting for age-related differences in SRT, and EF task scores were less coherent (i.e., less strongly intercorrelated with each other) after the removal of SRT. Age-related differences in EF were smaller (Cohen ds = 1.36 vs. 0.78), and poverty-related differences in EF were larger (Cohen ds = 0.30 vs. 0.46) after accounting for SRT-related variation. Finally, consistent with previous studies, SRT-related differences in fluid reasoning were mediated by EF skills. Results are discussed with respect to using a brief measure of SRT to partially address the problem of measurement impurity at the level of individual EF tasks.

Comments

Accepted version. Journal of Experimental Child Psychology, Vol. 170 (June 2018): 30-44. DOI. © 2018 Elsevier B.V. Used with permission.

Recommended Citation

Willoughby, Michael T.; Blair, Clancy B.; Kuhn, Laura J.; and Magnus, Brooke E., "The Benefits of Adding a Brief Measure of Simple Reaction Time to The Assessment of Executive Function Skills in Early Childhood" (2018). Psychology Faculty Research and Publications. 323.
https://epublications.marquette.edu/psych_fac/323