Table Tennis Experts Outperform Novices in a Demanding Cognitive-Motor Dual-Task Situation

Abstract

Theories on motor skill acquisition predict that earlier learning stages require more attention, which should lead to higher cognitive-motor dual-task interference in novices as compared to experts. Expert and novice table tennis players returned balls from a ball machine while concurrently performing an auditory 3-back task (working memory). The groups did not differ in 3-back performance in the single task. Cognitive dual-task performance reductions were more pronounced in novices. A similar pattern emerged for the number of missed balls in table tennis, except that experts outperformed novices already in the single task. Experts consistently showed costs of about 10%, while novices showed costs between 30% and 50%. The findings indicate that performances of novices suffer considerably in motor-cognitive dual-task situations.     

Recrafting Youth Risk Assessment: Developing the Modified Positive Achievement Change Tool for Iowa

ABSTRACT

Risk assessments have become prevalent in the juvenile justice field. Many of these tools are adopted off-the-shelf and not adapted to fit the characteristics of a jurisdiction’s justice-involved youth. We examined the Positive Achievement Change Tool (PACT) in Iowa. Although used widely, the PACT is relatively unmodified. We updated the tool via item selection and weighting, gender-specific models and multiple outcomes, developing the Modified Positive Achievement Change Tool (M-PACT) for Iowa. We identified an average predictive accuracy increase of 7%. Evidence of reduced racial disparity was also observed, and research implications outline the need to customize assessments to improve predictive accuracy.