To study how auditory and verbal hallucinations work, Swiss scientists developed a robotically-assisted technique to make people who have no history of mental illness hallucinate voices that are not there.psychiatric disorder schizophreniawith any mental health issues — sometimes hear voices that aren't there, too, and scientists still don't know why.
Recordings in hand, the blindfolded participants were sat in between two parts of a robotic unit: one in front of the subjects, which they were asked to poke, and one behind them, which poked their backs in return. The experimenters timed these pokes to be both simultaneous — that is, the robot poked the participants at the same time they poked it — and on a brief delay, which saw the robots poking them a few seconds after they first poked it.
Diagram of the researchers' "task block design" featuring the poking robot. Image via Psychological Medicine/Cambridge.
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