An unnerving study has proved that it’s possible to control the minds of monkeys. Scientists who embedded electrodes in the brains of macaques were able to influence the decisions made by the primates, Motherboard reports. After learning which of two images a macaque preferred, they fired up the electrical impulses and were able to reverse their preference, according to a study published online this week in Current Biology. Will this technique be able to manipulate our own thoughts in the future? The research team admits it’s conceivable—if we undergo surgery for the electrodes to be implanted.