The mechanism of the unconditional reaction is, under ordinary
circumstances, almost automatic. It is evolved on the background of
general protoplasmic characteristics, combined with structural polarity,
symmetry[, etc.], and is not efficient enough for the survival of higher organisms.
Under more complex conditions, the adjustment for survival must be
more flexible: a similar direct stimulation must, under different conditions,
result in different reactions, or different stimuli, under other conditions,
produce similar reactions, resulting, ultimately, not only in direct responses
to stimuli, but also in the equally important holding in abeyance of the
reaction, or even the abolishing of it. Let us assume that the direct response
of a cat to a mouse would be clawing and chewing. If that given cat would
just claw and chew when the mouse was some distance away, I am afraid
such a cat would soon starve, for such an immediate response would not be a
survival response, and this characteristic could not become hereditary. The
cats which have survived and perpetuated their characteristics are, as a rule,
different. When they see, hear, or smell the mouse at a distance, they flatten
out, keep still, crouch[, etc.], and get ready, until they are in such a position that a
jump will procure the victim, and not merely frighten it away.
We see that, under more complex conditions, the nervous mechanism
must produce not only direct responses to the stimuli but also equally
important delays and temporal or permanent abolishments of these direct
responses to stimuli.
—Alfred Korzybski (1933)