Alicia is talking on her cell phone to her friend Maya. If Maya is in a crowded subway terminal, Alicia finds that she has to nearly shout for Maya to be able to hear her. However, when Maya is in a meadow on her grandparents’ farm, she can easily tell what Alicia is watching on TV as they talk. This is one illustration of __________.

The __________ is a small circular opening that allows light to enter the eye.

Research on human pheromones should have what impact on a person’s decision to purchase pheromone-based products to make themselves more attractive and desirable to others?

The authors mentioned the interesting correlation between natural red hair and lower pain thresholds compared to persons with other natural hair colors. This is most likely to be due to the fact that __________.

The somatosensory system responds to sensory information about __________.

Jan can see objects well up close, but they appear blurry from afar. She is probably __________.

The average human being has more than __________ olfactory genes.

The gate control theory of pain suggests that the __________.

Which of the following occurs in people who suffer from hyperopia?

Lanny has worked as a radio personality for the local professional baseball team for more than 20 years. Though he has gotten older, fans marvel at the fact that his “silky sweet voice” has remained almost unchanged. This quality to Lanny’s “radio voice” is best described as its __________.