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05. Motor Threshold Hunting

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Umair Hassan edited this page Dec 25, 2019 · 1 revision

Motor Threshold Hunting function of the BEST Toolbox, trigger the stimulating device on trial by trial basis in a given inter-trial-interval and measures the Amplitude of MEP and then adapt the stimulation intensity for next trial on the basis of current MEP amplitude. It also presents you online results of MEPs and Stimulation Intensity traces in order to visualize the MEP shape and its threshold stability throughout the procedure.

Setting Stimulation Parameters

  1. Input Device: Select the input device using drop down menu from previously added devices
  2. Output Device: Select the output device using drop down menu from previously added devices
  3. Display EMG Channels: Type the channel name as a string in order to visualize its online results e.g. 'APBr'. Note that the channel name must resolve to the name in your streaming data
  4. Motor Threshold: The motor threshold in mili volts. In case of active motor thresholding it can be 0.1 mV and in case of resting state Motor thresholding it can be 0.05 mv.
  5. Starting Stimu. Inensity: Stimulation intensity to start from for the threshold titration e.g. 25 or 30
  6. No. of Trials: Total number of trials e.g. 100
  7. No. of Trials to Avg.: Last N number of trials to average for calculation of Motor Threshold e.g. 10
  8. Inter Trial Interval: ITI scalar, or a range in seconds e.g. 4 or [4 6]
  9. MEP onset (ms): The lower and upper limit of MEP search window in ms. MEP is searched using this update-able window and its amplitud and other measures of spread are stored in the data
  10. Pre-Post Stim Extract (ms): The lower and upper limit of EMG data to extract and save in the backend in ms
  11. Pre-Post Stim Plot (ms): The lower and upper limit of EMG data to plot online in ms
  12. Y Axis Max/Min: Limites of plot's Y axis [Lower Upper] in micro-volts
  13. Font Size: Font size of annotations on plots
  14. Trial No for Mean MEP Amp: The no of last N trials to avg and annotate on plot

Starting the Measurement

To start a particularly filled measurement, just press the "Run" button. The measurement can be stopped, paused/unpaused and some of the editable parameters such as Font and YAxis limits can be updated on the runtime.

An instance of the completed filled stimulation parameters panel is shown below.

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