Once you get the hang of some basic idea generation, it could be a plus if you read up on some simple psychology. Why ? Because it helps us get some depth when we get into GP topics that concern shaping society (either by the government, business community, the media, religions etc. ) if we know what motivates people to do things and what modifies their behaviour.
Here are somes links (all from the same useful site) that puts some theory across in a very digestible way :