| The serial dependence effect is manifested in the systematic and stable bias of our response to the current stimulus towards the previous stimulus.In recent years,research has found that this effect is strongly regulated by selective attention.However,the specific regulatory mechanism of selective attention on this effect is still unclear,and this issue is a key issue that urgently needs to be addressed in the field of sequence dependent effects research.Therefore,based on the theory of perceptual load,this study sets the key factor of selective attention-perceptual load-to two conditions: high and low levels,in order to explore whether and how high and low perceptual loads affect sequence dependency effects.This study used a new paradigm formed by combining letter search paradigm and orientation judgment task,and designed three experiments to investigate the above issues.Experiment 1 aims to explore whether sequence dependent effects can still be observed using the new experimental paradigm;If this effect is observed,further investigate whether there is a difference in the intensity of sequence dependent effects under high and low perceptual load conditions.In Experiment 1,the subjects were required to complete two experimental tasks.One was a letter search task,which involved finding the target letter "X" or "N" in the experimental stimuli presented on the screen and responding with a button when a question mark appeared;The second is the orientation judgment task,which requires the participants to rotate the reaction bar that can be adjusted by pressing the left and right keys to the previously presented grating direction,and press the space bar to enter the next trial;On the basis of experiment 1,experiment 2 fixed the response time of the letter search task at 1.5 seconds(in experiment 1,there was no limit on the response time)to investigate whether the results of experiment 1 were affected by working memory.Its experimental task is the same as Experiment 1;On the basis of the first two experiments,Experiment 3 increases the uncertainty of experimental stimuli by increasing the grating noise level(high noise level and low noise level).Therefore,Experiment 3 is 2 × The intra subject design of Experiment 2 consists of four experimental conditions to examine whether the research results of Experiment 1 are affected by sensory uncertainty.The experimental process is consistent with Experiment 2,and the experimental tasks are the same as Experiment1 and Experiment 2.The results showed that in Experiment 1,both experimental conditions produced significant sequence dependent effects;In addition,we also found that the sequence dependent effect generated under high perceptual load conditions is significantly stronger than that under low perceptual load conditions.The results of experiment 2 are the same as that of experiment 1,that is,the sequence dependence effect under high perceptual load is significantly stronger than that under low perceptual load,which indicates that the results of experiment 1 are not affected by working memory,or are less affected by working memory;The results of Experiment 3 showed that the sequence dependence effect under high noise high perceptual load conditions was significantly stronger than the other three experimental conditions,indicating that the experimental results obtained in Experiment 1 were not affected by sensory uncertainty or were less affected.In summary,the main conclusion of this study is that the sequence dependence effect under high perceptual load conditions is significantly stronger than that under low perceptual load conditions,and this result has been verified in both subsequent experiments,indicating that this phenomenon is relatively stable;In addition,this study further demonstrates the viewpoint of sequence dependent effects of selective attention regulation. |
