Decreased Event-Related Desynchronization of Mental Rotation Tasks in Young Tibetan Immigrants.

The present study aimed to explore the cortical activity underlying mental rotation in high-altitude immigrants via the event-related desynchronization (ERD), the electroencephalogram time-frequency analysis, and source localization based on electroencephalographic data. When compared with the low-altitude individuals, the reaction time of mental rotation tasks was significantly slower in immigrants who had lived in high-altitude areas for 3 years. The time-frequency analysis showed that the alpha ERD and the beta ERD within the time window (400-700 ms) were decreased during the mental rotation tasks in these immigrants. The decreased ERD was observed at the parietal-occipital regions within the alpha band and at the central-parietal regions within the beta band. The decreased ERD might embody the sensorimotor-related cortical activity from hypoxia, which might be involved in cognitive control function in high-altitude immigrants, which provided insights into the neural mechanism of spatial cognition change on aspect of embodied cognition due to high-altitude exposure.