An ERP Study On The Inhibition Character Of Attentional Bias For Negative Stimuli During Affective Processing Of Students With Depression Tendency

With the development of society, the depression with its high incidence has got researchers increasingly attention, but its mechanism still cannot be explaned exactly. People with depression tendency are the high-risk group to get depression. Studying them can help us further understand the clinical characteristic of depression, and also can help us to prevent and control depression occurs.This study takes emotional conflict experiment as the first experiment, to discuss the characteristics that students with depression tendency show during processing complex affective information. The second experiment uses clues-target paradigm, combining the technical of event related potential, to discuss the inhibition aspect of attention. The results are as follows:1. The students with depression tendency have the attentional bias for negative stimuli.2. When the SOA is 14 ms and the SOA is 250ms, the students with depression tendency have the cue effects for sad faces. When the SOA is 750ms, the participants have IOR effects for sad faces. But the normal students have had the IOR effects for sad faces since the SOA is 250ms. The characteristics of ERP show that the students with depression tendency need more attentional resources. The result shows that the lack of inhibition is the reason to the attentional bias of people with depression tendency.Experimental results verify the Beck depression cognitive theory which thinks that depressed mood come from the bias for negative stimuli in affection processing. The bias can influce the processing of positive information and the inhibition of negative stimuli, that makes people getting further and stronger depression.