Alpha frequency as self‑boundary biomarker

Individual alpha‑band frequency in parietal cortex predicts how sharply a person distinguishes their body from external objects, as shown by correlations with susceptibility to the rubber‑hand illusion in a 106‑participant EEG study reported in Nature Communications. Faster individual alpha rhythms correspond to a crisper embodied self; slower rhythms correspond to blurrier self‑other boundaries. — If validated, this provides a simple, noninvasive neural biomarker for disorders of self‑experience (e.g., dissociation, schizophrenia), and it has downstream implications for VR/robotics design, legal questions about agency, and targeted clinical interventions.