You, Rewired: How New Technologies Can Impact Your Sense of Self

Our sense of self is one of the deepest and seemingly immobile expressions of brain activity. If something as innocuous as a magnetic field can change it then, who are we, really?

At some time during our toddler years, we start to understand that we’re a distinct person with free will and a constant internal monologue, distinct from everyone else around us, and (unless we’re struck with a neurodegenerative disease) our sense of self is the bedrock upon which we interact with the world for the rest of our lives.

But the sense of who we are, is the result of neural activity, no different from less abstruse aspects of our personalities like whether we like broccoli or not. Deeper, self-referential philosophy about who we are might recruit more mental maps than the simpler stuff, but it’s all still just bioelectric sparks in the synaptic void.

Now imagine we could somehow isolate or read those neurological impulses that make up the dream you had last night, the memory of your first pet, or your feelings for your spouse, and even affect them.

In fact scientists already have — albeit in very basic terms. In 2015 researchers at the National Institute of Neurological Disorders and Stroke implanted a remote-controlled device into the brains of mice that delivers drugs and can shine a light source on individual neurons. The technology could not only reveal neural circuits very precisely, it lets the scientists determine the path the mouse walked by — to some extent — controlling its behavior by turning neurons “on” and “off” at will using the light source.

Back in 2010, headlines were made by an even more sensational experiment when scientists at MIT induced mild electrical currents in the scalps of subjects using a technology called transcranial magnetic stimulation (TMS). The currents slightly disrupted a brain region called the right temporo-parietal junction not enough to destabilize the subjects’ sense of their personality — but when tested on their moral understanding of other people’s intentions, they found their moral reasoning impaired.


If such technology is possible, what else might we use it to alter? Could every aspect of our sense of identity — from our moral beliefs to our love of our families — be simply zapped by some machine, changing us into a fundamentally different person from the one we woke up as?

Dr. James Giordano is a professor of neurology and biochemistry and chief of the Neuroethics Studies Program at Washington D.C.’s Georgetown University Medical Center, and says technologies like TMS (transcranial magnetic stimulation) and TES (transcranial electrical stimulation) can certainly affect patterns of node and network activity of our brains. “[These technologies] can induce ‘back and collateral propagation’ effects to alter the activity of linked brain networks that are involved in a number of cognitive and behavioral functions.”

However, Giordano adds that the tools we have today tend to modulate activity of neuron networks rather than switch them on or off, or generate them. “The analogy is that they function more like a dimmer switch to ‘adjust,’ increasing or decreasing neurological nodes and networks that are in a particular activity state.” In other words (thankfully so, many might think) that means we don’t have the technology to make you think of a boat when asked to picture a dog, make you a believer after a lifetime of atheism, or convince you that killing is a good way to settle a dispute with a neighbor.

“Use of [these technologies] can affect the ‘disposition’ to visual imagery, or be clearer in our interpretation of certain visual images, but not to imagine a specific object or event,” Giordano says. “That said, use of TMS can make us somewhat more susceptible to certain patterns of thought and emotion, and perhaps increase suggestibility. But current forms of transcranial neuromodulation can’t be used to completely alter existing beliefs or moral convictions or implant ideas.”

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  1. ⇧: Our brain is subject to Theseus’s paradox, where every part of a ship is thought of as being the same ship even though every part is gradually replaced. Our sense of self is the constant expression of a primitive survival drive that actually shifts

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