Registered Electroencephalographic Technologist (R. EEG T.) Practice Exam

Artifacts in an EEG recording are typically unwanted signals that can interfere with the interpretation of brain activity. Patient movement is a significant factor that can introduce artifacts into an EEG. When a patient moves, the electrical connections between the electrodes and the scalp can be disrupted. This can produce noise in the signal, leading to artifacts that may mimic or obscure genuine brain activity, making it challenging to obtain accurate readings from the EEG.

Beyond movement, factors like calculated impedance also relate to the quality of electrode attachment but do not in themselves cause artifacts. A photoparoxysmal response is a reaction of the brain identified by specific patterns in the EEG, often due to light stimulation, rather than an artifact. Sleep spindles are also normal brain wave patterns observed during specific sleep stages. Each of these other options reflects either a physiological response or a technical aspect of EEG recording that doesn't introduce artifacts in the same manner as patient movement does.