StimTracker can detect the onset of these events and send them to several recorders simultaneously.


Know precisely when events are happening.

Keep recorders in sync.


The biometric data that you collect, e.g. from EEG or eye tracker, is vastly more useful when it includes markers that tell you exactly when certain events occurred.

Types of Events

There are two StimTracker models: Duo and Quad. The Quad adds support for vocal response onset (voice key) and more light sensors; see table below for details.

The onset of events is detected autonomously by StimTracker to avoid operating system delays.

Onset of Visual Stimuli

Fast light sensors included.

Onset of Auditory Stimuli

Pass the audio via StimTracker, set threshold, and let it do the rest.

Event Codes via USB

Send event codes from your stimulus presentation computer for added information.

Onset of Key Response

Compatible with RB response pads (Quad model also accepts TTL input).

Onset of Vocal Response

It’s like getting a free voice key device (Quad model only).

Plug-and-Play, Flexible Output

StimTracker uses m–pod to deliver its signals. This means it’s compatible with more than a dozen popular recorders.

It also means that you can choose which types of events are sent to the recorder.

The Quad model adds direct TTL output and the option to install a Raspberry Pi board.

Models Available For


AD Instruments

ANT Neuro



Brain Products






Parallel port


Tobii Spectrum

Jitter Free USB

When sending event markers via USB, StimTracker delivers them with jitter free precision when used with SuperLab 6 or with our open source Python or C++ libraries. Delay is guaranteed to be 2 milliseconds exactly, every time.

Power Packed

The combination of powerful 32-bit microprocessors and our software makes possible the following features:

Async Output

To send, say, a 10ms long event marker with other I/O devices, an app needs to raise the output line, wait 10ms, then lower the line. With StimTracker, all the software needs to do is send a command and resume its work while microprocessors take care of delivering the pulse.


Pattern Generator

A truly unique feature: tell StimTracker when to send pulses at a later time, e.g. to mark emotional points during a movie presentation.

Use StimTracker as a signal generator on an output line or as a more complex pattern generator.

The Family


Marks onset of visual stimuli

Number of light sensor inputs

On Quad model, you can use 3 light sensors and a microphone (for voice key), or 4 light sensors and no microphone.

Marks onset of auditory stimuli

Marks onset of RB-x40 response pads key presses

Marks onset participant vocal response via microphone

Accepts external TTL input

Time-stamped output via USB

Number of simultaneous m–pod outputs

Direct TTL output

m-pod delivers TTL output as well.

Optional Raspberry Pi support

StimTracker Quad

3 + 1


StimTracker Duo



Software Support

Some software packages can deliver jitter free performance, but not all.

Jitter Free Software Support

SuperLab 6

C++ Library

Python Library

Version 6 will be a free upgrade to all SuperLab 5 license owners.



We offer an E-Basic code sample. Precision is 5 to 8ms.


Related Products

Stay in Touch

Stimulus Presentation

Stimulus Presentation

Response Pads for fMRI

Voice Key

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