Speed of Processing Time Slowing in Eating Disorders

We applied Brinley (1965 Brinley, J. F. (1965). Cognitive sets, speed and accuracy of performance in the elderly. In A. T. Welford, &; J. E. Birren (Eds.), Behavior, aging and the nervous system (pp. 114–129). Springfield, IL: Charles C. Thomas. Google Scholar]) plot analysis to the eating disorders field. Across 23 studies and 165 experimental conditions experienced by a total of 773 eating disorder (ED) participants, including anorexia nervosa (AN), binge eating (BE), bulimia nervosa (BN), and eating disorders not otherwise specified (EDNOS) and 995 controls], the best-fit regression equation was Y (ED) = 1.08 X (CONTROL) – 31. This equation accounted for 98.2% of the variance. Thus, the ED subjects were only 1.08 times slower than the control subjects, suggesting little processing speed slowing in ED. We also examined simple reaction time SRT; Y (ED) = .91 X (CONTROL) + 63; variance accounted for = 93.6%] and choice reaction time (CRT; Y (ED) = 1.12X (CONTROL) – 43, variance accounted for = 99.7%). These slopes are significantly different. ED subjects are more impacted when the task involves a decision component (CRT) than when it does not (SRT).