As with all modern ECU's, they do indeed have a learning capacity.
All the ecu contain a base map for ignition and fuelling, the learning bit to which people refer, is merely a programme built in to the ecu to fine tune the running parametres of the car, it does NOT adapt to driving style at all, but to the engine and it's needs, the trouble is it can also adapt to certain faults and mask them, making them harder to find.
The learnt setting will be stored as trim values + or - in a seperate chip which are then added or subtracted from main map memory, which is burnt in on the "CHIP", that som many refer to, so is permanent, in the sense that it cannot be altered by disconnection of the power source, but can of course be adjusted with software.
These trim values can be deleted, normally with taking out a fuse marked "KAM" or Keep Alive Memory.
tabetha