QtracW Threshold Tracking Software

QtracW Threshold Tracking Software

£2,000.00£4,000.00 exc. VAT


  • Stimulus response software for nerve, muscle or cortical excitability
  • Optional QTMS protocol extension for solo TMS operators
  • Acquisition via National Instruments DAQ interfaces
  • Compatible with the Digitimer DS5 and DS4 isolated current stimulators
  • Licences for 3 years, discounted for non-commercial users
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Introduction to QtracW Threshold Tracking Software

QtracW Threshold Tracking Software is a flexible, stimulus-response data acquisition program with averaging, threshold-tracking and latency-tracking facilities, originally written for studies of human nerves in vivo, but also used for microneurography, muscle excitability testing and cortical excitability testing with transcranial magnetic stimulation.

It is most appropriate for experiments in which the excitability or response of the preparation varies slowly with time, either due to programmed changes in the stimulus or to an externally initiated treatment, and the data of primary interest are the changes in selected parameters (threshold, amplitude, latency, etc.) of the response with time. All or selected raw response waveforms can also be recorded, enabling the time course of additional response parameters to be calculated after the recording is finished. QTrac (which became QtracW when adapted for Windows) comprises separate stimulation and plotting programs, QTracS and QTracP, both written in Visual Basic 6.0, which have the same mode of operation and share many of the same facilities.

The Digitimer DS5 Bipolar Constant Current Stimulator was specifically designed to work with QtracW software for human studies of nerve/muscle excitability. The major components of a human nerve excitability setup include a PC running QtracW software, a nerve stimulator (e.g. Digitimer DS5), an isolated EMG amplifier (e.g. Digitimer D440-2) and a compatible DAQ interface. We also strongly recommend the Digitimer Humbug Noise Eliminator or D400-2/D400-4 to remove mains interference, as many QtracW systems are mobile and used in electrically noisy hospital environments.  For animal-based studies, our DS4 Biphasic Stimulator is a suitable alternative to the DS5 and compatible with QtracW.

For those unfamiliar with the application of QtracW software in studies of nerve excitability, we recommend the recent article by Prof. Matthew Kiernan and colleagues (Kiernan et al. 2020), which provides guidelines for the measurement of axonal excitability and provides a state of the art review of axonal excitability research.

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Product Information

QtracW Software

QtracW Operator’s Manual

Typical Equipment Setup for DS5/QtracW Installation

Publications which cite use of QtracW can be found on Google Scholar.




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    Additional information

    User Type

    Commercial User, Academic/Hospital User