[Eeglablist] importing biopac data into eeglab

[Cedric Cannard]

Hi Simone,

I don't know abou thte biopac plugin, but .mat is MATLAB format so you can simply drag and drop into MATLAB or load via the MATLAB interface. But then you'll need to know the EEGLAB structure to convert that into EEGLAB. 

An easy alternative I have often used is to save your data as .EDF instead (in the Acknowledge software). Then, load it in EEGLAB using the biosig or import_edf plugins. The latter can be installed via EEGLAB's extension manager. 


Cedric



On Monday, June 24th, 2024 at 9:40 AM, Simone Sulpizio via eeglablist <eeglablist at sccn.ucsd.edu> wrote:

> Hi,
> 
> I'm a new Biopac user and I'm trying to import some emg data acquired with
> Biopac MP160 system (wireless system) into eeglab.
> 
> The data come from an experiment programmed with eprime, I present written
> stimuli and record participants manual responses. I also have markers
> signaling the presentation of each stimulus and the participant response.
> 
> On the biopac side, I'm recording emg from both participants' hands (one
> channel per hand), at a sampling rate of 2000 Hz.
> I've saved the data into 2 file formats: .mat and .acq (which should be the
> biopac format).
> I want to import these data into eeglab - I'm using the matlab version
> r2023b and the latest version of eeglab. I've also installed the biopac and
> the biosig plug in.
> 
> I first tried to import the .acq file, via the biosig extension, but I
> receive an error saying that the data format is unsupported.
> I then tried to import the .mat file, always using the biosig extension. In
> this case, I could import the data, but I received a warning saying that
> the sample rate is unknown. The data are thus automatically imported with a
> sampling rate of 125 Hz and there is no way for me to specify a different
> sampling rate. The result is that the latencies/timing of my markers are
> all out of scale (but they would be correct if the sampling rate was
> correctly read).
> Note that if I open the .mat file in Matlab without passing through eeglab,
> the sampling rate is correctly read.
> 
> Does anybody have any suggestion on how to read the .acq file in eeglab or
> how to fix this issue in the sampling rate so that I can correctly read the
> .mat file in eeglab?
> 
> Thanks!
> 
> 
> 
> 
> --
> Simone Sulpizio, PhD
> Department of Psychology
> University of Milano-Bicocca
> Piazza dell'Ateneo Nuovo, 1
> 20126 Milano, Italy
> Ph. +39 0264483714
> simone.sulpizio at unimib.it
> https://urldefense.com/v3/__https://sites.google.com/view/simonesulpizio/home__;!!Mih3wA!FjuV5d-00fyOR4OHZF4dPBiXJA3QvbFVLPeoGxhjB8ebVD3UC5MtMi5dD33HQdnu0aLUVkhnZjDNvJSAuBxqIRXhjFHBKKAoVw$
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