First, light reflects off an object to the eye.
Taste and Smell Are Linked Taste gustation and smell olfaction are related senses. Mantis shrimps can perceive both polarized light and multispectral images and have twelve distinct kinds of color receptors, unlike humans which have three kinds and most mammals which have two kinds.
What are the 7 Senses? This part is made of cartilage and skin. There, the auditory ossicles — three tiny bones called the malleus hammerincus anvil and stapes stirrup — vibrate. Something salty or sweet, however, often meant the food was rich in nutrients.
Researchers believe that opsins in the skin can sense different wavelengths of light and help the creatures choose a coloration that camouflages them, in addition to light input from the eyes. For example, pain receptors in your gums and teeth may be stimulated by temperature changes, chemical stimulation, or pressure.
Taste Taste, or gustation, refers to the capability to detect the taste of substances such as food, certain minerals, and poisons, etc. Spiders have been shown to detect electric fields to determine a suitable time to extend web for 'ballooning'. In the second type of sensory transduction, a sensory nerve ending responds to a stimulus in the internal or external environment: this neuron constitutes the sensory receptor itself.
Here is a great diagram of the eyeball. Reptiles like snakes and monitor lizards make extensive use of it as a smelling organ by transferring scent molecules to the vomeronasal organ with the tips of the forked tongue.