Recent work has found, for instance, that two-thirds of the brain is involved in simple eye movements; meanwhile, half of the brain gets activated during respiration. In 2019, several teams of scientists found that most of the neural activity in “perception” areas such as the visual cortex was encoding information about the animals’ movements rather than sensory inputs.
Source article: https://www.quantamagazine.org/mental-phenomena-dont-map-into-the-brain-as-expected-20210824/