Vigilance--Motivation--Emotion-- Purposive Behavior
The auditory system, as described in chapter 2, was characterized as an instrument for detecting and localizing a distant acoustical disturbance, and as a contributor to the identification of the disturbing event. These tasks were said to be performed within an action-oriented behavior. At the end of the chapter it was understood that the end result of the examination of the disturbance does not altogether depend on the relationship between the physical properties of the stimulus and the efficiency of the activated auditory system. The stimulus as a releaser of a purposive behavior (definition below) is weighed by the organism not only by means of auditory capacity in analyzing an acoustical event, but through a simultaneous evaluation of the event's significance as well.
The action-oriented behavior of the organism is determined by its genetically prescribed, species-bound program, linked to the actual space occupied by the species. The neural representation of the stimulating event therefore largely depends on the environmental pressure on the organism within this niche. Any action- oriented behavior involves modulating forces adding to the motor-sensory capacity of the organism when evaluating the external world: attention, emotion, volition, memory, and learning. On