Geotagging your photos? Old hat -- Neurowear wants to geotag your mood. The folks that brought animated cat ears to the human race is now using NeuroSky's brainwave-reading headgear to suss out your emotional state and share it with your friends. We dropped in on the group at Tokyo Game Show to take a look at an early prototype. After strapping a familiar Mindwave mobile headset to this editor's skull, a companion iPhone app sprung to life, reading off relaxation levels and assigning cartoon faces to the user's mood. The reading could then be recorded on a map, tagging how the user felt at a given location and time and allowing them to share that information with their friends. Had a great time at a new coffee shop? Now you can prove it, and encourage your social contacts to join you. It's an interesting idea, but its still a long way from hitting the app store -- the demo we were given was only a concept app, and the geotagging portion of the demonstration was simulated. It may be awhile before you can tweet your feelings directly. Need another way to express yourself? Don't worry -- Nerosky is adding a brainwave controlled tail, dubbed Shippo, to its line of cranium controlled animal parts. Check it out (as well as our quick neurotagging demo) after the break.