[Eeglablist] How many epochs to average for the ERP

[IMALI THANUJA HETTIARACHCHI]

Thank you Tarik and Tom for your guidance and input.

I have already started reading on Steve Luck¡¯s book and it provides a whole lot of information. I understand that the process is not straight forward, but a bit tricky.

All the support given answering my question including David and Makoto too  is very much appreciated.

Best regards
Imali

From: Tom Campbell [mailto:tom_campbell75 at hotmail.com]
Sent: Friday, 31 August 2012 6:35 AM
To: tarikbelbahar at gmail.com; IMALI THANUJA HETTIARACHCHI
Cc: eeglab list
Subject: RE: [Eeglablist] How many epochs to average for the ERP

Good call Tarik. P300 seems a good high amplitude component to start testing a lab out with on one healthy young adult using some form of oddball paradigm, before making adjustments to the lab. Trying out the real macoy is a good place to start. The right number of trials to get a the signal:noise needed will depend on your lab and how you set it up. In practise, not every factor that causes noise can be always be identified, controlled, or eliminated. Various tests involving a bucket or even a melon can be revealing about sources of external noise if this becomes a concern. T.




________________________________
From: tarikbelbahar at gmail.com<mailto:tarikbelbahar at gmail.com>
Date: Wed, 29 Aug 2012 17:56:25 -0700
Subject: Re: [Eeglablist] How many epochs to average for the ERP
To: ith at deakin.edu.au<mailto:ith at deakin.edu.au>
CC: eeglablist at sccn.ucsd.edu<mailto:eeglablist at sccn.ucsd.edu>; tom_campbell75 at hotmail.com<mailto:tom_campbell75 at hotmail.com>

I f you're just starting off for the first time,
please do yourself a favor and read the whole
ERP bible, not just the ten commandments.

hope this helps you a bit.

search your topic on google scholar.
read and depend on multiple
articles in high-level journals
by the experts on your topic.
This is a necessary step in designing any study
and making your research effective in possibly
contributing to current questions or problems.

searching p300 number of trials on Google Scholar gives:

Please read  the articles below closely...

On the number of trials needed for P300<http://www.sciencedirect.com/science/article/pii/S016787609600743X>
J Cohen, J Polich - International Journal of Psychophysiology, 1997 - Elsevier

Event-related potentials in clinical research: guidelines for eliciting, recording, and quantifying mismatch negativity, P300, and N400<http://www.sciencedirect.com/science/article/pii/s1388-2457%2809%2900518-5>
CC Duncan, RJ Barry, JF Connolly, C Fischer¡­ - Clinical ¡­, 2009 - Elsevier

On the number of trials needed for a stable feedback©\related negativity<http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8986.2010.01152.x/full>
J Marco©\Pallares, D Cucurell, TF M¨¹nte¡­ - ¡­, 2011 - Wiley Online Library

Also please note that there is a movement in EEG/ERP research to explode the ERP,
and understand topics such as single-trial variability,
variability within subjects, and even more simply,
visualizing single-trial EEG via tools such as eeglab's erpimage.


last, if you want to test your EEG system,
I suggest you read Steve Luck's Chapter
on Setting up a Lab, and that you do
testing to check your hardware, connections,
stimulus timing, etc...
Good luck and let the list know
how things go!


















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