What are the rules behind sentiment coding in TextiQ?

I'm just starting to dabble in TextiQ and am interested in understanding the basic 'rules' behind how the tool determines the sentiment score. While I'm sure there is much complexity, are there basic rules, such as a negative word like 'no' or 'not' within X words of a key word would lead to a negative sentiment score. I could not find anything that provides this type of information.