What Does It Indicate If a Sleeper's EEG Shows Long,slow,high-Amplitude

Multiple Choice

What does it indicate if a sleeper's EEG shows long,slow,high-amplitude waves?​

A) The muscles are tense and ready for vigorous activity.
B) ​More than the usual number of neurons are producing action potentials.
C) ​Most neurons are active in synchrony with one another.
D) ​Neurons in the left hemisphere are more active than those in the right hemisphere.