Speed of Processing Time Slowing in Eating Disorders.

We applied Brinley ( 1965 ) 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).