Hi There, 

I want to simultaneously record EMG (to record left and right index finger movements) and EEG activity using biosemi equipment. 

So far I take two external electrodes usually used for EOG recordings. Place one on the upper and one on the lower end of the FDI muscle. Here you get a negative deflection with a finger tap and a positive deflection with a thumb tap. On the surface this looks like it is recording what I need. 

My (perhaps silly) question is whether this is the correct protocol? Is there actually a difference between the electrodes used for EOG and EMG? Or is it OK to use the external channels for this purpose? 

Thanks in advance!