However, it is fair to ask whether a human brain, if it could be kept alive in isolation, receiving no sensory inputs and able to generate no behavioural outputs at all, could “cause” (or be directly associated with) a mind. The answer is probably “no”, just as an isolated cell would cease to live if it were deprived of all signals from the environment and rendered incapable of specific outputs. Several well-known experiments have shown that sensory deprivation quite rapidly disorientates human subjects; in effect, they begin to lose their minds. Minds are “caused” by brains that are actively processing sensory inputs and generating outputs, not by brains in isolation.
on Human Evolution, p. 207