My Neuropsych is a little rusty, but as I recall, GABA itself is inhibitory, so a drug that inhibits GABA will actually increase firing. And yes, GABA is implicated in a bunch of different processes. I can't answer as to whether you could generate a vegetative state like that, but my guess would be that it would be unlikely, as a medication is likely to change the global level of GABA, rather than the level in the particular areas discussed here.
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My Neuropsych is a little rusty, but as I recall, GABA itself is inhibitory, so a drug that inhibits GABA will actually increase firing. And yes, GABA is implicated in a bunch of different processes. I can't answer as to whether you could generate a vegetative state like that, but my guess would be that it would be unlikely, as a medication is likely to change the global level of GABA, rather than the level in the particular areas discussed here.