How to eliminate artifacts caused by magnetic stimulation (do not confuse with MRI artifacts):
The magnetic stimulator could induce a current to flow in the (for example) EMG leads. A possible solution might be to twist the EMG recording leads in a tight spiral so the effects of the external magnetic field are minimized.
Another method would be to shield the leads using a highly magnetically conductive material (like permalloy). This material requires no electrical connection. A permalloy cable wrapped around the leads could help reduce artifact. Normal shielded leads would not help in this situation if a magnetic field looks to be the primary culprit. The shielded leads only work to minimize impacts of electric fields, not magnetic fields.
Finally, it may be possible to reduce or remove the noise in post-processing or real-time.
Electrodermal Activity (EDA) is an objective index for understanding emotional states. Researchers measure EDA to gain insights on psychological or physiological response, leading them down the path of scientific discovery. Because EDA is so important to research, BIOPAC has created tools to optimize event-related EDA analysis. Topics include: how to identify skin conductance responses, convert stim events from E-Prime SuperLab, Presentation, Vizard, etc., into AcqKnowledge events that can used for analysis, and score skin conductance responses using the AcqKnowledge automated EDA analysis tool.
NIRS and CNAP—Pairing great tools for great data Cerebral hemoglobin concentration (blood mass in the brain) is frequently measured in the prefrontal cortex, and systemic arterial blood pressure is known to be a variable factor based on the hemoglobin concentration. A leg pressure cuff was used to constrict and release blood flow to create a […]
BIOPAC’s just released Introductory ECG Guide addresses fundamental to advanced concerns to optimize electrocardiography data recording and analysis. Topics include: ECG Complex; Electrical and Mechanical Sequence of a Heartbeat; Systole and Diastole; Configurations for Lead I, Lead II, Lead III, 6-lead ECG, 12-lead ECG, precordial leads; Ventricular Late Potentials (VLPs); ECG Measurement Tools; Automated Analysis Routines […]