If I had to guess, I'd say our minds are easily manipulated.
The goal though (speculating) is probably to change our emotions, as they're more powerful. After all, we have brains in our guts. The problem is IMO that the mind rejects a lot of unpleasant things for its survival. Yet, the gut senses horror and knows and records.
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The Enteric Nervous System: The Brain in the Gut
The gut has a mind of its own, the "enteric nervous system". Just like the larger brain in the head, researchers say, this system sends and receives impulses, records experiences and respond to emotions. Its nerve cells are bathed and influenced by the same neurotransmitters. The gut can upset the brain just as the brain can upset the gut.
http://www.psyking.net/id36.htm