Electroencephalography (EEG) Has Been Used to Characterize Different Patterns of Sleep

Multiple Choice

Electroencephalography (EEG) has been used to characterize different patterns of sleep. Stage 1 and 2 of sleep is characterized by high frequency activity. What causes the EEG signal?

A) Cortical and thalamocortical neurons fire synchronously.
B) Cortical and thalamocortical neurons fire independently.
C) Cortical and thalamocortical neurons fire at high frequencies.
D) Cortical and thalamocortical neurons fire in bursts of activity.