If a researcher finds that one drop of perfume diffused through a three-room apartment is the minimum amount of stimuli needed to notice the scent, then this would be a test of one's

The _____ is the lowest level of stimulation that a person can consciously detect 50 percent of the time that the stimulation is present.

The tendency of the brain to stop attending to constant, unchanging information is known as

Many people believe that some stimuli act upon the unconscious mind and influence behavior, a process called

_____ is the way the brain deals with unchanging information from the environment.

"Packets" of light waves are referred to as

Color is largely determined by the

Light bends as it passes through substances of different densities, a process known as

As your lens hardens through aging, you may have trouble with