== Can the lead be explained in layman's terms? == 

 Is it possible to rephrase much of the lead section to be understandable to people without a background in the subject?  

 I realize that this is an article about a specialty within a field and that it can't be expected to be all at the layman's level.  However, even having read quite a bit about psychology the lead is nearly meaningless even after reading the leads of the articles it is linked to.