-
Instead, they sat people in a chair and asked them to push a button that, a fraction of a second later, caused a rod to gently press their back. After a few rounds, the volunteers got the creeping sense of someone behind them. Faced with a disconnect between their actions and their sensations, their minds conjured another explanation: a separate presence in the room.
In a new study published in the journal Psychological Medicine, researchers from the same lab used the ghostly finger setup to probe another kind of hallucination: hearing voices. They found that volunteers were more likely to report hearing a voice when there was a lag between the push of the button and the rod’s touch than when there was no delay.