Racial and ethnic stereotypes can sometimes bias our perceptions of others' behaviors. This best illustrates the impact of: 

• retinal disparity
• interposition
• top-down processing
• perceptual adaptation

The fact that perceptions involve more than the sum of our sensations best illustrates the importance of: 

• top-down processing
• interposition
• retinal disparity
• visual capture

Which of the following is true?

• Humans cannot sense stimuli below the absolute threshold.
• Humans cannot be affected by stimuli below the absolute threshold at all.
• Stimuli presented below the absolute threshold can have a subtle, brief effect on behavior.
• Stimuli presented below the absolute threshold exert a strong, powerful effect on behavior.

If you move your watchband up your wrist an inch or so, you will feel it for only a few moments. This best illustrates: 

• parallel processing
• accommodation
• sensory adaptation
• Weber's law

As we look at a flower, the intensity of the color we see is related to the light wave’s:

• amplitude
• hue.
• length.
• placement on the spectrum.

The eye’s “blind spot” is related to:

• light rays focusing too far in front of the retina.
• light rays focusing too far behind the retina.
• a cluster of cells around the fovea which contains cones, but no rods.
• an area without receptor cells where the optic nerve leaves the eye.

Rather than saying a person is “colorblind,” it would be more accurate to say that the person:

• has a blind spot.
• lacks red- or green-sensitive cones.
• is experiencing an overstimulation of the red- and green-sensitive cones.
• has an excess of blue-sensitive cones. 

The hammer, anvil, and stirrup are found in the:

• middle ear.
• inner ear.
• cochlea.
• outer ear.

What is umami?

• a savory, meaty taste sensation for which researchers recently discovered receptors on the tongue
• receptors on the tongue that respond only to bitter tastes
• receptors on the tongue that allow us to taste nutrients in food, such as proteins and vitamins 
• a condition in which there is a loss of the sensation of taste

As you talk with a friend at a party, her voice is distinct from all the other voices you hear.  This illustrates the perceptual principle of: 

• grouping.
• proximity.
• closure.
• figure-ground.