What are the important points to be taken care of while using Emotiv Epoc + headset to acquire SSVEP data?

I am using Emotiv Epoc + headset to acquire my raw EEG data. I am using matlab software to generate flickering on the computer screen. My flickering frequencies are 6.75 Hz, 15 Hz and 20 Hz....

03 March 2016 7,400 4 View