As already indicated, no portion of the cortex, not even the sensory areas, is directly connected with any sense organ.
Training does not increase the sensitiveness of a sense organ.
Here the stimulus is distorted by the sense organ and so may easily be taken as the sign of an unreal fact.
But by means of which sense organ was it received by the horse?
The axons of the sensory nerve divide into fine branches in the sense organ, and thus are more easily aroused by the stimulus.
Time is no force that could conceivably act as a stimulus to a sense organ.
Typically, the stimulus is an external force or motion, such as light or sound, striking on a sense organ.
It is a general rule of the nervous system that no nerve cell extends without a break from any sense organ to any muscle fiber.
A perception, then, results from the stimulation of a sense organ.
A nervous activity which consists of the passage of a disturbance from a sense organ to a muscle is called a reflex.
sense organ n.
A specialized organ or structure, such as the eye, ear, tongue, nose, or skin, where sensory neurons are concentrated and which functions as a receptor. Also called sensor.