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mickcrosse / mTRF-Toolbox

A MATLAB package for modelling multivariate stimulus-response data
https://cnspworkshop.net
BSD 3-Clause "New" or "Revised" License
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Time index for input data #6

Open Trang0412 opened 4 years ago

Trang0412 commented 4 years ago

Hello, I am now trying to use mTRF toolbox for auditory related EEG signal data. I'm quite confused about the time index of input. How can I identify the time index of EEG as input for mTRcrossval or mTRFtrain? For example, we got the EEG data recorded from -500ms to 2500 after the stimuli onset. In this case, which ranges of data should I put as input for the model? Or just put the signal recorded from 0ms after stimuli onset time? If in this case, then we can not get results at -200ms time lag, is it right?

mickcrosse commented 4 years ago

Hi, From your description, I'm assuming that your EEG trials are 3 seconds long, correct? And your stimuli are less than that? The time-lags you input should reflect a window of temporal delays between your stimulus and EEG response - think of the timecourse of an ERP for example. So a safe bet would be to use something like tmin=0 and tmax=300 (milliseconds). Make sure that the onset of your stimulus corresponds to the start of the EEG data though (so I think you would remove the first 500 ms of EEG?). Does that make sense? Mick