Sense Organs
Sense Organs, in humans and other animals, faculties by which outside information is received for evaluation and response. This is accomplished by the effect of a particular stimulus on a specialized organ, which then transmits impulses to the brain via a nerve or nerves. Aristotle classified five senses as follows: 1. Hearing , a sense by which sound waves are perceived by the organ of hearing—the ear —in vertebrate animals. The process of sound perception is called audition. The physical stimulus of auditory sensation is the vibration of some material object. The vibration is transmitted from the object to the ear, under ordinary conditions, by a wave movement of air particles. 2. Sight (vision ) , is the ability to see the features of objects we look at, such as color, shape, size, details, depth, and contrast. Vision is achieved when the eyes and brain work together to form pictures of the world around us. Vision begins with light rays bouncing off the surface of objects.