To Study OCD, Scientists Get Their (Rubber) Hands Dirty

The rubber hand illusion is a classic experiment that reveals how our brains build a sense of our bodies. For the latest twist on the illusion, researchers simulated OCD-like feelings of disgust in subjects by starting with rubber hands and adding fake blood, vomit and feces.

The basic rubber hand experiment is simple to set up. It requires a fake hand, two paintbrushes, a table, and something to use as a little wall. A subject sits with both hands flat on the table, one of them farther o

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