More excited for negative facial expressions in depression: evidence from an event-related potential study.
OBJECTIVE
This study aims to investigate the intensity evaluation of social stimuli in depression.


METHODS
Twenty-four never-disordered control participants (NC), 24 sub-clinically depressed individuals and 24 participants diagnosed with a current major depressive disorder (MDD) were recruited. All participants completed an emotional intensity evaluation task, in which they were required to judge the intensity of the facial expressions by pressing response keys, with the event-related potential (ERP) being recorded during the process.


RESULTS
The MDD participants had higher intensity scores for sad faces compared with the NC group, longer reaction times (RTs) for all faces compared with other groups and higher P1 and P2 amplitude for sad faces compared with other faces. The sub-clinically depressed individuals had lower intensity scores for happy and neutral faces compared with other groups, longer RTs for happy faces compared with other faces and higher P1 and P2 amplitudes for happy faces compared with sad faces.


CONCLUSIONS
The findings suggest that the MDD participants are more excited for negative facial expressions, while the sub-clinically depressed individuals might have a disturbed perception for happy stimuli, which suggests a different cognitive pattern for facial expressions between MDD and sub-clinical depression. Moreover, the deep perception for sad faces is correlated with increased suicidal ideation.


CONCLUSIONS
The intensity effect of social stimuli (facial expressions) was observed in sub-clinically and clinically depressed (MDD) individuals simultaneously, which might suggest that the more excited perception for negative facial expressions is a stable cognitive vulnerability possibly associated with the occurrence or recurrence of depression.
Educational Centre of Mental Health, The Third Military Medical University, Chong Qing, China.
Qin
Q
Dai
Zhengzhi
Z
Feng
D000293:Adolescent; D000328:Adult; D000375:Aging / Q000502:physiology; D015982:Bias; D016022:Case-Control Studies; D003071:Cognition / Q000502:physiology; D003866:Depressive Disorder / Q000453:epidemiology / Q000503:physiopathology* / Q000523:psychology*; D003865:Major Depressive Disorder / Q000453:epidemiology / Q000503:physiopathology* / Q000523:psychology*; D005071:Evoked Potentials / Q000502:physiology*; D005149:Facial Expression; D005260:Female; D006801:Humans; D008297:Male; D012008:Recurrence; D012649:Self Concept; D012720:Severity of Illness Index; D012727:Sex Characteristics; D059020:Suicidal Ideation; D055815:Young Adult