Apologies for the necro, but I spent  a good while searching for this info before eventually deciding to poke the BHAVs and get it myself, and it seems like it'd be a Good Thing if other people don't have to do the same. Since syberspunk never posted this anywhere public, here's the list of skills and their associated interests:

Logic: Paranormal, work, school, sci-fi
Body: Crime, health, sports, travel
Creativity: Money, culture, food, fashion, toys
Charisma: Politics, environment, entertainment, weather, animals

If your sim has the same number of points in two interest groups, the first one (in order of the list) will determine his/her base skill.