They will keep using animals because we know fuck all about how actually brains work and you cannot slice human brains and probe them to see electrical properties all the time since they are supply-constrained. This study is using a information channel of very very high-level, top-down approach.
Even for non vegetarians, MSG (monosodium glutamate) is a pretty cool addition to the kitchen toolbox, just order some and start experimenting!
Do some controlled ones, for example split a portion into two, ask a 2nd person to sprinkle some onto one of them and try both of them and guess which one has MSG on it.