1. How are sensation and perception different? Give a specific example.

2. What is an absolute threshold? How was the concept changed by signal detection theory?

3. Explain how lateral inhibition enhances edges or how it accounts for Mach bands.

4. How are the receptive fields of retinal ganglion cells created? Be specific in your answer.

5. In humans, night vision is poorer than daytime vision. Explain why.

6. Explain why the number of colors we can see exceeds the number of wavelengths in the visual spectrum.