Final answer:
Electroencephalography (EEG) is the procedure that records electrical impulses of the brain to measure brain activity, providing a chart that shows frequency and amplitude of brainwaves.
Step-by-step explanation:
The procedure that records electrical impulses of the brain to measure brain activity is electroencephalography (EEG). This non-invasive method involves the placement of electrodes around a person's head. These electrodes detect the electrical activity in the brain and produce a chart called an EEG, which shows the frequency and amplitude of the brainwaves.
This technique is crucial for researchers, particularly when studying sleep patterns among individuals with sleep disorders, as it provides the temporal resolution needed to monitor the dynamics of brain activity.