The $\underline{\hspace{1cm}}$ variable measures effects of the independent variable.
experimental
dependent
independent
confounding
is a technique often used in studies investigating sleep patterns. Researchers place electrodes at various locations on a person's head in order to record brainwaves.
electroencephalography (EEG)
magnetic resonance imaging (MRI)
positron emission tomography (PET)
functional magnetic resonance imaging (fMRI)
The $\underline{\hspace{1cm}}$ nervous system is responsible for responses such as pupil dilation, increased heart rate, and increased respiration.
parasympathetic
autonomic
sympathetic
somatic