Understanding Event Markers in EmotivPRO

Event markers in EmotivPRO are essential for identifying and segmenting key moments during EEG data collection. These markers allow users to analyze specific events and their corresponding brain activity. Event markers must be added during the recording process and synchronized with the experimental design.

EmotivPRO provides flexible options for adding event markers into the data stream during your EEG recording sessions. This feature is essential for experimental setups where you need to synchronize stimuli with brain activity or mark specific events during your data collection.

You can manually enter markers into the data stream through several methods including serial port markers, keystroke markers and USB markers.

Lab Streaming Layer (LSL) Integration

EmotivPRO supports the Lab Streaming Layer (LSL) protocol, which facilitates high-precision data synchronization between EmotivPRO and third-party software. This feature is ideal for research projects that require sub-millisecond timing precision or for scenarios that involve communication between multiple devices or software platforms.

With LSL, you can ensure seamless data synchronization and interaction with other applications, enabling more complex experimental setups and improving the reliability of your data collection. This two-way communication is especially useful in advanced neuroscience research, where precise timing and accurate data transfer are critical.

More Resources

For more detailed information on using markers and the LSL protocol in EmotivPRO, you can refer to the following resources:

Lab Streaming Layer (LSL) Overview

Emotiv GitHub: Lab Streaming Layer

Event Markers: Baseline Markers

Event Markers: Serial Port Markers

Event Markers: Keystroke Markers

Event Markers: USB Markers

Event Markers: Emotiv Extender Triggering

Can I add event markers after recording?

Currently, EmotivPRO does not support manually adding event markers to EEG recordings after data collection. The software requires event markers to be incorporated in real-time, typically through:

• EmotivPRO Event Marker Tool: While recording, users can manually click or use keypress markers to insert events.

• Synchronized Experimental Design: Event markers can be programmed in advance through platforms like the EmotivPRO Builder or third-party tools integrated with the experiment like PsychoPy. 

What to do if event markers were not added during recording?

If your original recording does not include event markers but you have event timestamps logged in some other form, you can still analyze your data using below steps:

1. Export the recording:  In EmotivPRO, export your EEG recording as an aggregated .CSV or .EDF file.

2. Create your own event marker file: Using applications like Excel or Google sheets you can create your own event marker file.