Poster Session C, Sunday, March 24, 5:00 – 7:00 pm, Pacific Concourse
An ERP study of dream lucidity and reality monitoring
SHIH-KUEN CHENG1, Moo-Rung Loo1; 1Institute of Cognitive Neuroscience, National Central University, Taiwan
Dream lucidity refers to the degree to which a dreamer is aware of the difference between the dream context and the real world. It has been considered to be a spectrum, ranging from totally not knowing one is dreaming to fully aware of being in a dream. The lucidity in a dream is therefore related to the discrimination between self-generated precepts in a dream and externally derived experiences when being awake, a capacity resembling the “reality monitoring” in source memory. This experiment investigated the relationship between dream lucidity and reality monitoring. 25 participants rated the lucidity of their dreams for 7 consecutive days. They then engaged in a reality monitoring task to differentiate words associated with pictures or mental images. The behavioral results showed that participants performed better in both the old/new recognition and source judgments for imagined trials than perceived trials. They also showed more internalization errors (misattributing perceived pictures as an imagined one) than externalization errors (misattributing imagined object as perceived pictures). A correlational analysis found the lucidity to be positively correlated with the externalization bias and negatively correlated with the number of internalization errors. Importantly, the “late posterior positivity”, an ERP wave that has been linked to visual imagery, was of greater magnitude for hit trials to the imagined objects than the perceived pictures, and the difference negatively correlated to the number of externalization errors. These results suggested that people with high lucidity performed better in reality monitoring and tend to misattribute imagined items to perceived ones.
Topic Area: LONG-TERM MEMORY: Episodic