The ability to sense the internal state of the body, known as interoception, may be linked to our mental health, and macaques appear to have similar capabilities to us
Rhesus macaques appear to be as sensitive to their own heartbeats as human babies are, suggesting the monkeys have an awareness of their own bodily systems.
The findings could open doors to a better scientific understanding of certain neurological and mental conditions in humans, says, the capacity to detect the internal state of the body.Previous studies have suggested that, at least in humans, individual variations in our sensitivity to internal signals and how they are interpreted in the brain might be linked to our emotions, as well as to certain mental and neurological conditions.
Rhesus macaques have certain structures in the brain and nervous system that suggest they are capable of interoception, but this hasn’t previously been experimentally tested, says Bliss-Moreau. She and her team came up with a way to test the hypothesis after hearing about a study that found evidence that human babies are sensitive toThey monitored the heartbeat of four captive-born adult rhesus macaques while they watched videos that showed a blob-like image bouncing with a rhythm that was either slower, faster or the same as each monkey’s own heartbeat. The team repeated the tests until each monkey had voluntarily completed 100 trials in exchange for sips of fruit juice.
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