The Impact Of Emotional Factors On Children With Adhd Task Switching

Cognitive flexibility is of great significance for the survival of mankind as a capability. It allows us to make changes in accordance with appropriate situational response. Task-switching is an important element of cognitive flexibility, which can fully reflect the characteristics of cognitive flexibility. Domestic and foreign research data shows that there is about 1 -10% of children with attention deficit hyperactivity disorder (ADHD), and cognitive flexibility defect is an important aspect of executive control impairment among these children. In this study, we used task-cueing paradigm, introduced emotional factors and adopted event-related potential technique. From the dynamic point of view, this paper not only explores the origin of switch cost of ADHD, but also explores which stage has defect in children with attention deficit hyperactivity disorder.In Experiment 1, task-cueing paradigm has been used and cue-stimuli interval (150 ms / 850 ms) has been manipulated to explore ADHD's cognitive flexibility in the preparatory stage , the results of which showed that, with the cue—stimulus interval increasing, ADHD children's switch costs is greater than that of the normal group, the results of which also found that children's processing of negative emotional stimuli is significantly faster than the neutral stimulus, especially in ADHD children; in experiment 2, task-cueing paradigm has been used and task sequence (ABA / CBA) has been manipulated for the study of ADHD's cognitive flexibility in the stage of response conflict, the results of which showed that the inhibition amount of previous A in the sequence of ABA in a positive mood is significantly less than under neutral conditions in normal children, the results of which also found that normal children in the prefrontal cortex appear The N200, which reflect the inhibitory component, whereas ADHD children does not appear; in experiment 3 , task-cueing paradigm has been combined with stop-signal paradigm , and the interval between target stimulus and stop signal (100 ms / 250 ms / 400 ms) has been manipulated to study ADHD's cognitive flexibility in the stage of response stopping, the results of which showed that, with the interval of stimulus and stop signal increasing, it is more difficult for ADHD children to stop the reaction of the target stimulus, in addition , the results of which also found that ADHD children's ability to stop is inferior to the normal group of children in positive emotions and negative emotional conditions.After an analysis of the experimental data and EEG data and a discussion of the results,this paper has four conclusions: Firstly, compared to normal children, ADHD children have defect in the stage of preparation, response conflict and response stopping of task switching. Secondly, compared to normal children, more competition took place between emotional processing and cognitive processing in ADHD group. Third, compared to normal children, ADHD produce more negative bias on negative emotional stimuli. Fourth, compared to normal children, ADHD children have inhibitory dysfunction in prefrontal lobe.