Poster E35, Monday, March 26, 2:30-4:30 pm, Exhibit Hall C
Investigation of latent inhibitory control variables and aerobic fitness
Daniel Westfall1, Lauren B. Raine1, Eric S. Drollette2, Mark R. Scudder3, Shih-Chun Kao1, Matthew B. Pontifex4, Arthur F. Kramer1,5, Charles H. Hillman1; 1Northeastern University, Boston, Massachusetts, 2The University of North Carolina at Greensboro, Greensboro, North Carolina, 3University of Pittsburgh, Pittsburgh, Pennsylvania, 4Michigan State University, East Lansing, Michigan, 5University of Illinois, Urbana, Illinois
PURPOSE: Converging evidence has demonstrated the importance of aerobic fitness for cognition in preadolescent children. However, to date, most studies have used traditional analyses, which investigate reaction time and accuracy separately. The current study utilized diffusion modelling to investigate latent variables that contribute to behavioral performance and associations with aerobic fitness. METHODS: Four hundred forty-eight children completed tests of aerobic fitness and inhibitory control. Behavioral data were entered into the EZ-Diffusion model to calculate drift rate (quality and speed of information uptake), boundary separation (response conservativeness), and nondecision time (encoding, memory access, and response execution). Hierarchical regressions were performed to investigate the associations between aerobic fitness and these latent variables while controlling for other potentially confounding factors. RESULTS: Higher aerobic fitness was associated with improved drift rate across conditions of the inhibition task (β’s ≥ .145, p’s ≤ .002). Additionally, longer nondecision time was associated with higher aerobic fitness across inhibition conditions (β’s ≥ .112, p’s ≤ .024). There were no associations with boundary separation (p’s > .506). CONCLUSION: These findings demonstrate that diffusion modelling is a novel and successful approach that combines RT and accuracy information to investigate latent inhibitory control factors associated with aerobic fitness. As such, higher fitness was not only associated with better information uptake but also with spending relatively more time in nondecision processes. Further, fitness level was not associated with response conservativeness. These findings add to the research base by indicating cognitive processes that are selectively influenced by aerobic fitness.
Topic Area: EXECUTIVE PROCESSES: Monitoring & inhibitory control