Examing our Bernese traditions, it becomes clear there is a very close connection to the log building traditions of the neighboring Alpine regions. It's hard to say just how connected they are. Is timber framing in Switzerland in fact descended from log building? If it is, the two styles diverged so long ago that we can't really say anything for certain.
Swiss timber framing all used to be of the frame and plank variety, where heavy uprights would contain horizontal planks set into grooves. Unless these structures are immensely large, bracing is unnecessary in the walls (even then, it's probably unnecessary) It is very easy to see how this is derived from the stacking of logs. In fact, a very common and very old shortcut in the log building cultures is to place stout uprights at the corners, saving the need of cutting the complex corner joints.
Most importantly, where space is not so limited outside of the mountains you often want to build large structures. With all of this in mind, I see the heavy frame and plank construction common to much of Switzerland north of the Alps to be a very natural evolution away from the more limited methods of log building. It is simply a case of adapting the methods to the needs presented.