Back
Home
4.4 identify that there are three types of cones, each containing a separate pigment sensitive to either blue, red or green light
identify that there are three types of cones, each containing a separate pigment sensitive to either blue, red or green light
- The cones contain three different photopigments. The trichromatic theory of colour vision suggests that each is sensitive to a different range of wavelengths, corresponding to the three primary colours red, blue and green. The sensitivity of these photopigments is broad enough to allow them to cover the full spectrum of visible light. Each pigment is thought to be located in different cones, and different colours are perceived in the brain from the sensory input from combinations of the three cone types. Thus the brain builds up a colour picture according to the number of impulses received from the three types of cones.