Flight of Ideas
Characteristic of mania; rapid speech with frequent shifts in topic (the changes are generally based on cogent associations).
Example: A man starts talking about his business, but quickly shifts to discussing the economy, the government, and other countries.
Grinnell, R. (2008). Flight of Ideas. Psych Central. Retrieved on April 29, 2016, from http://psychcentral.com/encyclopedia/flight-of-ideas/