[human-electrophysiology] Re: Any ideas about summing ERPs?

  • From: "Atlanta Flitton" <a.flitton@xxxxxxxxxxxxx>
  • To: human-electrophysiology@xxxxxxxxxxxxx
  • Date: Mon, 6 Aug 2007 14:46:58 +0100

Yes, we are looking at the divergence between the 'simultaneous' and 'sum'
ERP, that is correct.

But, what I need to be clear on is how to obtain the 'sum' ERP for the two
unimodal conditions.  I can get a sum wave (of sorts) by just taking my
epochs for Auditory stimulation and Visual stimulation and averaging them
together like that, but I wondered if I did it this way or if I some how add
the Grand Averages together by doing a peak analysis and then re-plotting on
the basis of that.



indicated auditory-visual (AV) neural response interactions.

-----Original Message-----
From: human-electrophysiology-bounce@xxxxxxxxxxxxx
[mailto:human-electrophysiology-bounce@xxxxxxxxxxxxx] On Behalf Of T Elliman
Sent: 06 August 2007 10:54
To: human-electrophysiology@xxxxxxxxxxxxx
Subject: [human-electrophysiology] Re: Any ideas about summing ERPs?

So shouldn't the formula be something like:

D = Y - (A + V)

Y = the response to audiovisual stimuli,
A = response to audio only,
V = response to visual only, and
D = the difference between presenting the stimuli together, and the sum of 
presenting them apart

I don't know too much about processing the ERPs, so can't answer the second 
part. It was the equation that threw me, because it seemed to be a circular 


--On 06 August 2007 09:48 +0100 Atlanta Flitton <a.flitton@xxxxxxxxxxxxx> 

> AV = (A+V)-AV

T Elliman

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