A Study Of The Response Inhibition Of ADHD Subtypes Based On The Stop-Signal Paradigm

The stop-signal paradigm is typical in studying response inhibition of ADHD. It simulates the real situation requiring response inhibition and asks the participants to execute or stop an action or thought rapidly and exactly. Firstly, this study is to investigate response inhibition of ADHD (Attention Deficit. Hyperactivity Disorder) subtypes based on the traditional stop-signal paradigm. Secondly, to understand the essence of the stop-signal paradigm better, the Redundant Signal Effect is brought in the study which changes the stimulus' character of the signal in response task and stop task respectively. This is an important innovation in this study and its value lies in: 1) to reveal how the response inhibition processes occur during the paradigm; 2) to help us to distinguish factors effecting the response inhibition of ADHD subtypes.41 pupils aged ten to thirteen from seven schools in Zhejiang Province, who were selected according to DSM-IV diagnosis, their medical history report and scales measure, participated. The subjects were 12 normal children and 29 ADHD children including 7 ADHD-I, 14 ADHD-H and 8 ADHD-C.This study carried 4 (subjects type: ADHD-I, ADHD-H, ADHD-C and Normal children)×3 (signal redundant condition: No redundant signal, React signal redundancy, Stop signal redundancy) ×2 (task: response task and stop task) mixture experiment design, to explore the response inhibition of ADHD subtypes.We used the Countermanding Procedure and Race Model to analyze the results above, and it showed that: 1) The impairments of response inhibition of ADHD subtypes in the traditional stop-signal paradigm were mainly because of responding...