Dictionary and Assertion rules for the Aggregate Plaintext Processor

[digital paula]

Hell again cTakes Community,
 
I think this will be an easy question.     Okay I've decided to start simple by 
first exploring the Aggregate Plaintext Processor without ULMS.   Since it's 
not using ULMS, where  is the dictionary and the assertion rules being defined? 
 Can these be modified easily?   For example,  I see that 'pain' and 'aspirin' 
gets annotated in text or if text states 'family history'  this will be noted 
as well.   Can someone enlighten me as to how cTakes generates this and if it's 
easily customizable?   
 
Thanks.
 
Regards,
Paula