[Eeglablist] [eeglablist] topoplot of condition difference STUDY in special range of oddball task

[elnaz ensafi]

Dear all,

I'm working on creating some topoplots of condition differences. I
know I should use the topoplot() function which only needs a list of
amplitudes (one per channel) and a list of channel locations. However,
I'm not sure how to create a data vector of amplitude for each channel
and how to use 'for' loop correctly to open and process each
participant file in each channel. by searching, I found that my data
vector should be a 99*1 vector (because I have 99 participants).

could you please help me in this regard?

following ths the code that I used to extract the peaks at special
range for 'Pz' electrodes.

MEAN_each= erpdata{1,1}- erpdata{2,1}; %Difference for Oddball-Control
for each subject
MEAN_Differece_all= mean (MEAN_each,2); % mean of difference for all subjects
plot(erptime, MEAN_Differece_all, 'k-') % plot the grand average
difference waveform for all subjects
N200= mean(MEAN_each(44 : 58,:)); % average +/- 25 ms for each sunject at N200
P300= mean(MEAN_each(93 : 106,:)); % average +/- 25 ms for each sunject at P300


Best,

Elnaz