Tiny matlab script to register a keystroke in the keyboard and send a marker to the LabStreamingLayer (LSL) Lab Recorder.

The aim of this script is to enable synchronisation of data recordings across multiple devices. Although, the Lab Streaming Layer (LSL) framework enables time-synchronisation, it requires acess to the api of each device. Unfortunately, some physiological measurement hardware do not provide direct access to their API.

So this, matlab script provides a simple workaround: it listens for the key press and if it detects a key code (currently F4 but you can change it) it will send a marker to the LabStreamingLayer (LSL) Lab Recorder.

We plan to use this to support an EDA (skin conductance) experiment, to register a marker in the Biopac Acknowledge software, and concurently send a marker in the LSL stream. Therefore, we will have to manually to import the rest of the markers for EDA in post-processing.

The rest of the data collection uses PsychoPy3 for stimulus presentation and the LSL Lab Recorder for data aquisition.

The script relies on having a working installation of:

• PsychToolbox
• LabStreamingLayer

Since I do not yet have access to the Biopac, I have not tested this solution: https://github.com/esdalmaijer/MPyDev