srah blah blah

If someone shouts at you, "Look out!" and you jump just in time to avoid being struck by a car, you owe your escape from injury to the fundamental cooperative act by which most of the higher animals survive: namely, communication by means of noises. You did not see the car coming; nevertheless, someone did see it and made certain noises to communicate the alarm to you. In other words, although your nervous system did not record the danger, you were unharmed because another's nervous system did. You had, for the time being, the advantage of an extra nervous system in addition to your own. [italics as in the original]