The doctrine holding that mental activities are simply epiphenomena of the neural processes of the brain .
副现象论认为思想活动不过是大脑神经作用的副现象的学说。
Physical events can cause other physical events and physical events can cause mental events , but mental events cannot cause anything , since they are just causally inert by-products ( i.e. epiphenomena ) of the physical world .
