0400 COGNITIVE BIAS PHENOMENON IN INSOMNIA PATIENTS

Abstract

Current study aimed to investigate cognitive bias on words stimuli in insomnia patients. Also by diversifying words stimuli, we investigated which types of words insomnia patients show cognitive bias most likely to. Twenty-four insomnia patients based on DSM-IV criteria and 21 healthy controls were enrolled. Three types of words including 39 sleep-related, 40 neutral, and 40 negative words were used as experimental stimuli. In the subjective emotional rating tasks, all the participants were asked to rate the emotional intensity of randomly presented list of different types of words on a 7-point Likert scale (-3 = most negative and +3 = most positive). Subsequently, participants were asked to indicate whether each word stimulus was related to sleep or not. There were no significant differences in self-rated valence on 3 categories of words between two groups, but only simple main effect of types of words (p = 0.000). Also, there were significant differences in the number of responses whether each stimulus is related to sleep in neutral category (p = 0.047). Insomnia patients responded to neutral stimuli as sleep-related more frequently compared to control group (7.810 ± 10.829 vs 2.714 ± 2.432). Current results support the presence of a cognitive bias towards neutral stimuli among insomnia patients. The cognitive bias may contribute to underlying mechanism of primary insomnia. This research was supported by Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT and Future planning (Study No.: NRF-2015R1C1A2A01054060).