They were monitored each night using an electroencephalograph ( eeg ) , which records the electrical activity of the brain .
他们每晚接受脑电图(eeg)监控,记录受试者大脑的电子活动。
The system released last year used a desktop computer , but the new system uses a portable electroencephalograph commercially available , and made it possible to bring the system to the subject 's home .
The electroencephalograph , or eeg , is a machine commonly used by doctors and researchers who want to know what the brain is doing without having to open up someone 's head and look inside .