[Eeglablist] Synchronization of EEG data with auditory stimulus

[Tarik S Bel-Bahar]

Hello Ali, some thoughts below, best wishes.


A simple method is to use an experimental software such as psychtoolbox,
and have it "synch up" with your eeg amplifier, and generate events with
each beep.
Another more principled/accurate way to do this is to have a audio sensor
that picks up the sound and records it's time. Of course the sensor also
needs to be fully aligned with eeg time.

If you trust your beep event times, and they are aligned with the EEG, then
you might be good as you are, just import your event list into eeglab (into
the eeg file).

One thing to be careful of here is that your eeg and time signal are
properly aligned (find a way to make sure that 0 time is 0 time in both the
eeg record and the beep events record).
Also watch out for jitter (e.g., inaccurate event timing info, unevenly
spaced beeps), and for "uncoupling or drift" of your eeg time and beep time
over the whole period of the recording.
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