Researchers wanted to determine the brain waves present when individuals were sleeping. They placed electrodes on the scalps of 100 volunteers, and then asked the volunteers to sleep in the laboratory each night for one week. The researchers obtained recordings of the electrical activity across the volunteers’ brain surfaces. Which of the following represents the operational definition of the dependent variable in this study?

Dr. Ultrone uses a technique to measure glucose consumption as an indicator of brain activity. What is the name of this technique?

Zoey did a report on the brain’s ability to change in response to both experience and damage. What was her report about?

When Amita is in a car accident, her neurologist, Dr. Lang, suspects she has sustained an injury to the back of her brain. “Can you check with an EEG?” asks Amita’s brother. Dr. Lang explains that an EEG is not the best method for assessing this injury, because

Dr. Translucent measures the brain’s electrical activity via magnetic fields, using a(n)

Dr. Ludwikowski was interested in studying effects of stress on the brain. She randomly assigned 10 middle-aged participants to experience stress by placing them in a room with a loud, unpleasant noise. The other 10 middle-aged participants were placed in a room with no noise. She then used an fMRI to compare participants’ brain activity.

In this study, what was Dr. Ludwikowski’s operational definition of her dependent variable?

Dr. Ludwikowski was interested in studying effects of stress on the brain. She randomly assigned 10 middle-aged participants to experience stress by placing them in a room with a loud, unpleasant noise. The other 10 middle-aged participants were placed in a room with no noise. She then used an fMRI to compare participants’ brain activity.

In Dr. Ludwikowski’s study, the participants in the room with no noise served as the