對數化繪製P值地形圖

正常使用topplot繪製P值圖是這樣的，P值越大，圖片越亮

但是因爲P值本身的原因，P值需要越小越好，這就需要改變繪圖的思路，可以對P值求一個log值再求負數，畫在地形圖上，就對顯著的區域一目瞭然

分享繪圖代碼如下

% Written By  Yizhou
% Using the code without proper understanding the code and relevant background
% of EEG may lead to confusion, incorrect data analyses,or misinterpretations
% of results.
% The author assumes NO responsibility for inappropriate or incorrect use
% of this code.
% WX：         17373158786
plog = -log10(P_ttest);
topoplot(plog, EEG.chanlocs,'maplimits',[0 3], 'electrodes' ,'off',   'verbose' ,'off', 'style' ,'map'); % 'electrodes' ,'off',是去除電極點，'style' ,'map'是去除等高線
colorbar('YLim',[0 3], 'YTick',[0,1,2,3],'YTickLabel',{'1','0.1','0.01','0.001'});
title('負性刺激vs中性刺激','fontsize',15); %改變標度爲log值