| ObjectiveThis study was designed to explore under the conditions of valid and invalid cues, subthreshold depression group, depression group and normal group whether exist attentional bias for different types of emotional words. To reveal subthreshold depression whether is homogeneous with depression, or it has own unique characteristics of a disease.MethodIn this study,3 (test groups:major depression group, subthreshold depression group, the normal control group)×3 (word type:positive words, depression words, neutral words)×2 (type of cues:valid cues and invalid cues) mixed design. The group of subjects is a between groups factor, word type and type of cues are within group factors.15 depression subjects were come from Nanhua University and the First psychiatric hospital in Hengyang City. Select 20 subthreshold depression subjiects and 20 normal control subjiects were come from Hunan Normal University and ChangSha Polytechnic University students, using Beck Depression Inventory tests of 300 college students, according to sub-scale screening. BDI≥9 points, but does not meet the DSM-Ⅳdiagnostic criteria for depression, subthreshold depression is divided into groups; the normal control group is BDI≤4 points. In this study, attentional bias studies using clues - Tips experimental paradigm, using DMDX software development.ResultsThe results showed a significant main effect of clues to the type (F = 18.84, P = 0.000), indicate the valid cues and invalid response cues exist a significant difference. A significant group main effect (F = 4.18, P = 0.021), shows the normal group, subthreshold depression group, depression group have a significant differences in reaction time. Group×clues to the type (F = 4.00, P = 0.024) a significant interaction effect, indicating that different groups of subjects were in different types of clues there were significant differences in reaction time. The interaction effect of group×word type is significant (F = 9.08, P = 0.000), shows different groups of subjects were of different nature of the vocabulary there were significant differences in reaction time.For different types of group clues simple effect analysis, clues to prompt and effective under the conditions of the normal group, subthreshold depression group, depression group were tested on the target word reaction time there were significant differences (F.01 (2,52)=70.58, p<.05). Invalid cues prompt conditions, the three groups of subjects were on the same target word reaction time there was a significant difference (F.01 (2,52)= 33.36, p<.05).Potency of different vocabulary simple effect of group analysis, the normal group, subthreshold depression group, depression group were tested on the positive word there was a significant difference in reaction time (F.01 (2,102)= 49.62, p<.05); three word reaction time of depression there are also significant differences (F.01 (2,102)= 36.75, p<.05); the same response time to neutral words significantly different (F.01 (2,102)= 10.27, p<.05).Subthreshold depression'group and the depression group have no significant difference (p>.05) in reaction time, But subthreshold depression group and the normal group there are significant differences in reaction time (p<.05). ConclusionNormal group, the subject's reaction time is faster than subthreshold depression group and the depression group, but subthreshold depression group and the depression was no significant difference. Under the conditions of invalid all group are faster than the valid clue, there is a inhibition of return effect. The inhibitory effect of depression in subthreshold depression group and major depression group are significant difference with the normal group. There is a negative attentional bias exist in them. Subthreshold depression is homogeneous with depression.
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