Threshold Tracking Tms
Threshold Tracking Tms - Related Videos
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FAQs
The adaptive tracking algorithm makes the measurement responsive to each recorded trial. When the evoked muscle response is compared with the predefined target, the algorithm changes the next stimulation intensity upward or downward according to whether the response meets that criterion. This estimates the stimulation level associated with the selected response rather than relying on one fixed setting.
Electromyography provides the response signal that drives threshold tracking. The recorded motor-evoked potential is compared with the predefined muscle-response criterion, allowing the algorithm to determine whether the next stimulation intensity should increase or decrease. Because the criterion is tied to a measurable response, the resulting threshold can indicate corticospinal excitability and changes in it over time.
Unlike a protocol that repeatedly applies one fixed stimulation intensity, Threshold Tracking TMS adapts intensity during testing. This design reduces dependence on how well a selected fixed level represents the participant’s current motor response. It is therefore suited to detecting short-term shifts and longitudinal changes in motor system function, including changes associated with pharmacological or rehabilitative interventions.
Testing combines stimulation over the motor cortex, electromyographic recording from the selected muscle, and an adaptive rule for changing intensity. Stimulation provides the input, electromyography captures the motor-evoked response, and the algorithm updates the next level according to whether that response satisfies the target. Together, these components produce a response-linked measure of motor-system excitability.
Researchers can use Threshold Tracking TMS when they need to examine cortical plasticity or neural excitability. The method also supports investigations of disease-related dysfunction and evaluations of pharmacological or rehabilitative interventions. In these settings, changes in the tracked measure provide a way to compare motor-system function across experimental conditions or during an intervention.
Repeated measurements can quantify longitudinal changes in motor system function, rather than describing only a single response at one time point. This makes the approach relevant to studies of evolving cortical plasticity, disease-related dysfunction, and responses to treatment or rehabilitation. Comparing tracked thresholds across assessments can show whether corticospinal excitability changes during the study period.
The predefined criterion establishes the response level that the adaptive procedure seeks to track. Each motor-evoked potential is evaluated against that target, so the algorithm can adjust stimulation and estimate the corresponding threshold. Using a consistent response criterion helps organize comparisons of corticospinal excitability across short-term measurements, longitudinal assessments, and intervention-related conditions.