The human brain is a constant. The ability of it has not changed any time in recorded history, only the knowledge of man has changed, and this knowledge is invested in the computer anyway. The computer has altered drastically for the better in such a short period of time that it is incredible. The compu ter has had improvements added to it almost non-stop, from a simple calculation device into a marvel of modern science, whilst the human brain cannot do anything but just stays there, not changing, not improving. Emotions can, too, be a liability as well as an asset.
Emotions make the mind dangerously unstable, performance subject to moods and emotional disruption.
The computer suffers no such problems. The human brain is easily stressed out by events and loses effectiveness when tired. Emotions blur the human brain's capacity to make clear, logical decisions, even when they are thrown before its eyes, and impair problem-solving capabilities. Age also has a devastating effect on the function of the human brain. Once senility sets in, the brain is of little use to anyone, and the person becomes a liability.