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.
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