Researchers Discover Brain Rhythm That Enhances Body Ownership

Researchers from Karolinska Institutet Highlight the Importance of Alpha Brain Waves

A new study published in Nature Communications reveals that alpha brain waves assist the brain in determining what belongs to one’s body. Faster rhythms enable the brain to correlate vision and tactile sensation more accurately, thereby strengthening the feeling that a body part is truly yours. Slower rhythms blur this synchronization, making it difficult to separate the self from the environment.

The research, conducted on a group of 106 participants, utilized behavioral experiments, EEG recordings, and brain stimulation. The results showed that the speed of alpha waves in the parietal cortex plays a crucial role in the perception of one’s own body. The lead author of the study, Mariano D'Angelo, explained: "We have identified a fundamental process of the brain that shapes our continuous experience of being embodied." These findings could provide new insights into psychiatric conditions such as schizophrenia.

To explore body ownership more directly, participants underwent the rubber hand illusion, a popular experiment. When a fake hand is touched simultaneously with a real hand, many feel that the rubber hand is part of their own body. The study successfully demonstrated that participants with faster alpha frequencies were better at detecting the differences in synchronization between what they saw and what they felt.

The implications of these findings are significant for the development of more effective prosthetics and improving virtual reality experiences. The research was conducted in collaboration with Aix-Marseille Université in France, supported by the European Research Council and other organizations. The results suggest that the way we perceive bodily sensations is closely related to the rhythm of alpha waves in the brain.