3. We can use brain implants to steer animals left and right.
Several years ago, neuroscientists invented a little rat-sized brain implant that sent directional signals to the rodent's brain. Using a handheld remote, scientists sent electrical signals to the parts of the rats' brains connected to right and left whisker sensations - and could induce the rats to turn right or left at the press of a button. Dubbed the "robo-rat," the creatures could be used for complicated search and rescue efforts that require crawling into small places. Or they could be the beta version for a more nefarious technology implanted into humans' brains that would allow a corporation like the Dollhouse to remote-control an active's every move, right down to which street they turn on.

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4. Infrared brain scans can predict what people want.
As we reported last week, researchers have discovered that a simple infrared brain scan can reveal patterns in brain activity that show simple preferences. Ask a person whether they'd rather have a dog or a cat, and this scan will give you the answer. This is the first step towards knowing how to shape people's preferences. If scientists could trigger a reaction in your brain that reversed the pattern, they might be able to turn a cat person into a dog person and vice versa.

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5. Human-computer interfaces link human brains directly to computers.
You may have heard of BrainGate, a technology that uses electrodes sunk into your gray matter to convert electrical impulses from your brain into computer commands. It is currently used by people who are profoundly paralyzed to communicate by moving a cursor around. If we can open up communication between brain and computer like that, it stands to reason that the communication might be two-way. Who is to say there is no secret organization using a BrainGate-esque technology to reprogram people's thoughts?