stimulus artifact
Electrical interference in neurophysiological recordings caused by stimulation devices, requiring recognition and filtration.
Full Definition
Stimulus artifact refers to electrical interference that appears in neurophysiological recordings as a direct result of electrical stimulation used during testing procedures. Common in nerve conduction studies, evoked potential testing, and intraoperative monitoring, these artifacts appear as high-amplitude, brief deflections at the moment of stimulation. The artifact can obscure early components of evoked responses and must be distinguished from physiological responses. Modern equipment includes artifact suppression techniques, but recognition of residual artifacts is essential for proper interpretation. The timing, morphology, and amplitude characteristics help differentiate artifacts from genuine neural responses.
Usage
Usage note: Critical to distinguish from physiological responses; timing relative to stimulus is key identifier.
In Context
- "The initial deflection represented stimulus artifact rather than a neural response." — Evoked potential report
- "Stimulus artifact obscured the early components of the somatosensory response." — Intraoperative monitoring note