The suffix "-gram" refers to a recording, while "-graphy" refers to the process of recording
- Electroencephalogram (EEG): Recording of the electrical activity of the Brain
- Electrocardiogram (ECG/EKG): Recording of the electrical activity of the Heart
- Electromyogram (EMG): Recording of the electrical activity of Muscles
- Electroretinogram (ERG): Recording of the electrical response of the Retina to light
Therefore, an Electroencephalogram is obtained from the bioelectrical signals of the Brain