The Impact of Social Stress on Trustworthiness Judgments in Schizophrenia.

The present study examines the impact of induced social stress on facial trustworthiness judgments in individuals with schizophrenia (SCZ) and the associations between symptoms and trustworthiness ratings. Thirty-three individuals with SCZ and forty healthy controls (HC) were asked to rate the trustworthiness of 24 digitally morphed faces in two counterbalanced conditions. Mild social stress was induced by listening to loud noises from a busy street. BPRS, CAPE-42, and the Paranoia Scale measured the severity of symptoms. We did not observe significant differences in trustworthiness judgments between the patient and control groups. Social stress did not impact trust judgments. Paranoia was negatively connected to trustworthiness ratings in the control group. Subjective rating of stress in noise condition was negatively associated with paranoia only in the control sample. In the patient group, a negative correlation was found between trustworthiness ratings in stress conditions and the severity of self-reported negative symptoms. Our results suggest that mild social stress does not significantly affect trustworthiness judgments in either patients with SCZ or in HC. Differences between the patient and control groups in trustworthiness judgments were negligible. Overall, the results of this study can be considered mainly negative and contrast with previous studies. The stress induction paradigm or a smaller sample size might cause observed results. In controls, biased face perception was linked to trait paranoia. By contrast, in SCZ, other factors might impact trust perception and need further examination.