[Eeglablist] Visual Artifact Rejection

[Brett DeMarco]

Hi everyone,
I just signed-up to this list last week, I am relatively new to the 
field and I have a question. In the literature and the EEGLab 
documentation there is mention of "visual artifact rejection". I'm not 
exactly sure what this entails...I understand that too high or too low 
(i.e. out of range) values should be rejected but are there any other 
techniques or guidelines that y'all follow to visually remove artifacts? 
If there's a short answer please let me know, if the answer is too long 
can someone point me toward a resourse I might be able to use?

Thanks very much in advance and Happy New Year!
bd