As we move around the world, the image that falls on our retinas changes every single moment.  As you walk around a table the shape, size, color, brightness of that table changes every moment.  However, do no perceive the table as changing every single moment.  Choose the option that best describes why this is the case.

The image above is ambiguous and could be perceived as either a 13 or a B.  If the image were surrounded by an A and a C we would immediately interpret it as a B.  However, when we are not given context, we have to rely solely on the sensation of the image, looking for clues in the shapes, spacing, etc.  This type of processing where we rely more heavily on the information from the sensory receptors is known as processing.

Match the class of drugs with its mode of action.

Which of the following depicts the largest correlation?

The in the brain regulates the activity of the gland, which is often referred to as the master gland of the endocrine system.

The Suprachiasmatic Nucleus (SCN) serves as the body’s clock and controls the circadian rhythm.  The SCN does this by responding to changing levels of __________ throughout the day.

As you are sitting taking this test there are many sounds around us, such as the hum of air conditioners, the sound of fans and lights.  We are rarely aware of all these constant background sounds.  Choose the option below that best describes why we aren’t always aware of all of these sounds around us.

A researcher is conducting a survey of political opinions of people living in Weatherford.  The researcher is sampling the population of Weatherford by putting up flyers around town asking people to fill out the survey.  The researcher, however, is worried that the characteristics of the people who choose to fill out the survey will be different from the overall population.  Which term below best describes the situation in which the people who choose to participate differ significantly from the population?

Use the example below of Jane being classically conditioned to identify the variables involved.   Every Saturday during the summer, an ice cream truck would drive by Jane’s house playing a specific song.  Each time the ice cream truck came by, she would get an ice cream cone, which made her very excited every time.  This weekend, she was watching a movie and the ice cream truck song started playing in the background and she immediately got excited.  (note: some answers may be used more than once and others may not be used at all)

In class, we said that an action potential is an all or none process, and will only be produced if the voltage of the axon reaches the threshold.  What happens to the voltage of the axon when the threshold is NOT reached?