[Eeglablist] Synchronization of EEG data with auditory stimulus

[ali zahedi]

Dear Tarik,

Thank you very much for the information you have provided, and sorry for my
late reply.
Can you please give me the detail on how I can use psychtoolbox and sync it
up with my EEG amplifier?
(I am really new in working with EEG hardware...).


I tried to find GUI in psychtoolbox but I only found a demo to produce an
audio.
Actually I do not have any idea to work with psychtoolbox and use it to
sync the beeps with my EEG data.
My beep generator (written in c#) works in real clock time and I get the
beep times in real clock time. However, my EEG data does not work with real
clock time and it has its own timer starting from 0 anytime I start
recording.

I really appreciate your support and I would be very grateful if you could
guide me to use psychtoolbox with more details.

Thank you very much.

Regards,
Ali


On Tue, 10 Apr 2018, 00:14 Tarik S Bel-Bahar, <tarikbelbahar at gmail.com>
wrote:

> 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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