Contrary to the common belief it is through vital energy (not electricity) sensory perceptions are experienced. This process is a dialectical one between brain and sensory organ in which vital radiations spread from brain to the concerned organs are very important.
Eyes : - Even while light rays don’t reach retina, there will be resting potentials is rods and cones of retina because of the vital radiations reaching there from the central nervous system when a person is fully awake (in conscious state)When light rays reach there the rate of ionization is changed (action potentials). Message of these changes are gone to brain through optical nerves. These changes are perceived and analyzed in the optical areas of the brain and then the idea about color, from etc of the object is got to the viewer.
Ears : - Resting potentials are present in the hair cells and cochlea in the ear, as mentioned above. When sound waves touch there, rate of potentials are changed and message goes to the auditory area of the brain. This process helps to derive the perceptions of sound.
Nose:- The olfactory neurons and olfactory epithelium are normally having resting potentials. When chemical substances (odorous molecules) touch these parts, rate of ionization changes and action potentials are created. The messages are gone to brain through nerves and one gets idea about the smell.
Toungue:- Nerve endings in taste buds, taste receptor cells, papille (squanmous) epithelium etc are normally having resting potentials. When different objects having different tastes touches these parts the chemical molecules in the objects cause change in the rate of ionizations. Action potentials are created and the messages are gone to the brain through nerves, and idea about taste is got.
Skin :- Nerve endings in the skin are normally having resting potentials. Touching with an object cause change in the rate of ionization and idea of touch is got in the brain.
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