[Eeglablist] p300 convention

[Steve Luck]

Mehmet-

The polarity conventions in ERP research are arbitrary and partially reflect historical accidents.  You can plot negative upward if you mainly want to communicate your results to people who are used to looking at ERPs with negative upward.  You should plot positive upward if you mainly want to communicate your results to the 99.999999% of scientists who use the Cartesian convention of plotting positive upward.

Steve


> 
> From: mehmet ali <theretinaguy at gmail.com>
> Date: June 16, 2011 5:29:38 AM PDT
> To: eeglablist at sccn.ucsd.edu
> Subject: [Eeglablist] p300 convention
> 
> 
> Hi all,
> 
> p300 is conventionally plotted on an inverted axis( positive potentials to down), is there a reason to end up with this convention?
> 
> Best,
> 
> 
> 
> 
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Steven J. Luck, Ph.D.
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