The calculation given for computing the LRP seems to be incorrect, I believe that for left hand responses the activity at C3 is subtracted from C4, rather than the reverse which is stated here. Coles (1989) used C4-C3(LH), as did Eimer (1998) where he represented Coles as using C4-C3 (LH). 

Thank you for these comments. Could you please alter the article citing the references that you have. Dr Joe Kiff (talk) 11:01, August 19, 2013 (UTC)

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