Dear all
I am currently conducting an experiment that would require whole-brain EEG, eye-tracking system, and biofeedback signals recording.
Besides, participants in this experiment would be asked to conduct a task. Hence, I am wondering if there is a way for me to synchronize the three systems I used, since the precise time would be crucial for the following data analysis.
The equipment I planned to use are EEG (32 channels, Neuroscan), Tobii eye glass ( or eyelink2000), and Procomp Infiniti.
The program I used to present stimuli is E-prime.
I recently read some articles that would report how precise their time recordings are (ex: the time lag between different equipment is within 20 ms). I am wondering if there is a way for measuring the value and to synchronize the equipment. Thanks!
Dear Hsing-Hao Lee,
you may want to take a look at lab streaming layer (LSL) which is a open-source software framework allowing time-synched recording of data streams from multiple modalities, such as EEG, eye tracking etc.
https://github.com/sccn/labstreaminglayer
Cheers,
Jonas
Hi Hsing-Hao,
Are your primary questions answered by the EEG data? If so, are you using eye tracking as a control, or are you interested in diving into eye tracking metrics? The Tobii Pro Spectrum samples up to 1200 Hz and is a great hardware option for setting up an environment where it is necessary to synchronize multiple systems. It has a large tolerance for head movement and the best accuracy/precision metrics on any of Tobii Pro's hardware. The software, Tobii Pro Lab, sends out TTL pulses, which can be accepted by the EEG software to synchronize timing. The Pro Spectrum hardware can also accept TTL pulses to ensure accurate timing. You can use E-Prime in this environment as well, if you prefer, or LSL as Jonas mentioned.
In full disclosure: I do work for Tobii Pro now, but I used some of the now discontinued eye trackers in my own work (T120 and T60XL). I hope this is a testament to my experiences with the technology, employees, and company as a whole! I'm attaching a product brochure for the Pro Spectrum, as well as one of my articles using our Tobii T60XL system for reference.
Please feel free to reach out to me directly if you have any questions!
Is there way to synchronize data from portable EEG and protable eyetrackers
Magda Nikolaraizi - hello! Are you asking about a portable screen-based system, or portable/wearable eye trackers? The short answer is yes to both, but it might depend on the EEG manufacturer. For instance, the Tobii Pro eye trackers work a little better with some systems vs others, depending on ports and software. If you want to chat more, you can email me: [email protected]. Looks like you're based in Greece, but I can connect you to one of my colleagues in Europe!
Hi Hsing-Hao Lee and Magda Nikolaraizi ,
The iMotions platform (https://imotions.com/) does all of that, and allows LSL communication as well. It integrates with almost all Tobii devices (as well as a range of other screen-based eye trackers, and portable eye tracking glasses), as well as a range of EEG devices, and almost anything can be connected through either LSL or the open API. (As a sidenote, as a standard it also allows integration with other biosensors, such as GSR/EDA, ECG etc). My disclosure - I work for iMotions, but we do provide software that has been designed to meet these exact needs, so I thought it worthwhile to let you know. Just let me know if you need any more information of course.
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