The US federal government allegedly spent nearly $100 million (£78 million) on monkey brain experiments. It comes after videos of the bizarre tests by the National Institute of Mental Health (NIMH) were obtained under freedom of information laws by bipartisan campaign group the '"White Coat Waste Project"'.
The footage shows some of the brutal experiments performed on the tiny primates, including on some whose brains had been purposefully damaged beforehand, reports suggest.
Papers showed scientists damaged the primates brains with acid and removed bits of their brains to see how it affected their reactions to stimuli.
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