Overview

The second generation StimTracker can connect directly to an RB-x40 response pad model via a DisplayPort cable (available in the store). Earlier RB-x30 models are not compatible. The cable connects the response pad to StimTracker’s “Response” connector.

The response pad must still be connected to the computer via a USB cable. This is needed for power, but also provides a dual output capability: when a key is pressed on the response pad, that information goes out simultaneously to StimTracker for precise marking and also goes out via USB to the stimulus presentation software, e.g. SuperLab.

How Event Markers Are Delivered

The most common application is to use m-pod. m-pod takes the multiplexed signals that StimTracker delivers and converts it into TTL output. By default, the output is “reflective”. This means that if the participant presses a key for, say, 1000ms, the width of the TTL output pulse will also be 1000ms. It is possible to change this behavior so that a shorter pulse is delivered on onset and another one is delivered on offset.

StimTracker can detect key presses on all keys. When used with m-pod, you can have each key press correspond to one output line, or you can have all keys map to a single output line; see m-pod’s Configuring Pin Assignments page.

StimTracker can also deliver time-stamped event marker information via USB; this is turned off by default but you can easily enable it.

On StimTracker Quad model only, event markers are also delivered via the “TTL Output” connector. Unlike with m-pod, output on this connector is always in “reflective” mode and cannot be changed.

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Last Revision: Apr 29, 2020