Interference Suppression Function And Multi-target Tracking Performance Enhancement Based On TDCS Combined With Cognitive Training

People are exposed to a large amount of dynamic information in daily environment,and constantly process these dynamic information.The process and mechanism of processing dynamic information is more complex than static information,and the Multiple Object Tracking(MOT)is widely used to study the attention processing mechanism of visual information in dynamic situations.In the process of Multiple Object Tracking,in order to ensure the high efficiency of the tracking task,the individual will inhibit the non-targets which are regarded as interference objects,so that the limited attention resources can be better focused on the target.In this process,the individual’s ability to inhibit non-target interference,that is,interference inhibition function,plays an important role.In this study,the MOT performance of individuals with different levels of interference inhibition function and the inhibition ability of non-target objects in the tracking process were investigated by the Multiple Object Tracking with Probe Dot Detection task,so as to explore the relationship between the interference inhibition function and the MOT performance.Then,tDCS combined with cognitive adaptive training was used to train the interference inhibition function of individuals.The purpose was to enhance the interference inhibiton function of individuals through combined training,so as to enhance their ability to inhibit non-target interference and performance in MOT.There were two sub studies in this study.Study 1 was divided into two parts:grouping and pretest.Sixty participants were measured by interference inhibiton task(including letter Flanker task and Stroop task).The participants were divided into two groups according to their performance in the two tasks:interference inhibiton function high group and low group.Then,the MOT performance and the ability to inhibit non-targets of the two groups were measured by the Multiple Object Tracking with Probe Dot Detection task.The combined task consists of two sub tasks:Task 1:fixed the number of non-target to 6,the number of targets changed among 3,4,5,or 6;Task 2:fixed the number of target to 4,the number of non-target changed among 4,6,8,or 10.The purpose of study one was to explore the difference of MOT performance of participants with different interference inbition function under different target and non target quantity conditions;Study 2 was the training and post test.For 60 participants who completed the pre test,37 of them were randomly divided into two groups:the training group(19 persons)and the active control group(18 persons).The training group participants had a 7-day of tDCS combined with cognitive adaptive task training,and the participants in active control group were given tDCS shame stimulation and parity judgement control tasks with equal duration.After completing the training,the two groups of participants respectively participated in the same measurement of interference inhibition function and the MOT performance as the study one,so as to investigate the training effect.The results showed that:in the Study 1,under the condition of low and medium number of targets and non-targets,the participants in the high interference inhibition function group had significantly higher accuracy and inhibition level than the participants in the low group,which showed that under the condition of this target and non target number,the participants with high interference inhibition function can better inhibit the interference of non-targets in the MOT,and the MOT performance was better.When the number of targets was high,there was no significant difference between the high and low groups in tracking performance and inhibition level of non-targets.The results of the Study 2 showed that in terms of interference inhibition function,the response time and interference effect of Stroop task and letter Flanker task measured after training in the training group were significantly lower than those before training,while there was no significant difference in the control group before and after training.In terms of MOT,the participants in the training group had a significant increase in tracking accuracy,target detection rate,inhibition level and other performance indicators compared with the pre-test in the MOT task with medium target and non-target quantity conditions.However,under the condition of lower or higher number of targets and non-targets,there was no significant difference in the above indexes before and after training.In the control group,there was no significant difference in MOT performance before and after training.Conclusion:(1)Individuals with higher interference inhibition function can better inhibit the interference of non-target objects in the MOT,and showed a better MOT performance;(2)tDCS combined with cognitive adaptive task training has a significant training effect on individual interference inhibition function;(3)The enhancement of interference inhibition function brought by training can help individuals better inhibit the interference of non-target objects in the process of MOT,so as to enhance the MOT performance,especially in the medium number of target and non-target conditions.But when the tracking task is difficult,the training effect is not significant.