Homework 3 key

Homework 3 key - Homework # 3: Color Vision Absorbance A B...

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As we saw in lecture, human retinas have three different types of cones, each with a different visual pigment in the discs of the outer segment. The three pigments have different, but overlapping, spectral sensitivities. The spectral sensitivity of one cone type is shown above. Any single cone type cannot tell us much about what wavelength of light is present in the stimulus, because the response of the cone depends on both the wavelength and the intensity of the stimulus. So if we look at a single cone, light at wavelength A will produce a response as shown below. Homework # 3: Color Vision A B Absorbance Wavelength A single cone cannot tell whether it is being stimulated by a weak stimulus at its preferred wavelength or a strong stimulus at another wavelength. This is why we cannot see color at night when we have only one kind of photoreceptor (our rods) activated by the low light levels available. Cell’s response to light of intensity X at wavelength A
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This note was uploaded on 09/08/2010 for the course NPB NPB 100 taught by Professor Campbell during the Spring '10 term at UC Davis.

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Homework 3 key - Homework # 3: Color Vision Absorbance A B...

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