Controlling devices with thoughts is no longer science fiction. Brain–computer interfaces (BCIs), emerging at the intersection of neuroscience and artificial intelligence, are opening the door to a new era of human–machine interaction.
The Next Great Invention in Human History?
What do you think is the greatest invention in human history? Take a moment to think about it. Was it writing, the wheel, the steam engine, electricity, or the Internet? Perhaps one of these—or perhaps another invention that comes to mind.
Now, set all of them aside for a moment and consider a technology that allows you to control electronic devices using nothing but your thoughts: the brain–computer interface (BCI). Imagine how such a technology could reshape the future.
Without a doubt, the two terms we hear most frequently today are neuroscience and artificial intelligence. One seeks to unravel the mysteries of the human brain, while the other aims to develop technologies capable of replicating its remarkable abilities. Today, we stand on the threshold of a technological revolution that brings these two fields together.
A World Controlled by Thought
Imagine controlling your smartphone with your thoughts; technologies that enable your phone to communicate with and operate all of your wireless devices; software that allows you to send messages while driving without lifting a finger; or neurorehabilitation robots that help people with paralysis regain mobility.
These are just a few of the many applications of brain–computer interfaces. Although they may still sound like science fiction to many people, this technology is rapidly transforming ideas once confined to fantasy into reality. In many ways, it resembles concepts that seemed impossible decades ago, such as the character Krang from the 1980s Teenage Mutant Ninja Turtles cartoon.
Whether we realize it or not, companies dedicated to developing BCI technologies have already been established, and many have made remarkable progress. Within the next few years, we are likely to witness BCI products becoming commercially available and gradually entering everyday life.
How Did Brain–Computer Interfaces Emerge?
The development of BCIs gained momentum during the 1990s, primarily to improve the quality of life of individuals with neurological disorders such as amyotrophic lateral sclerosis (ALS). In these conditions, brain function remains largely intact, but communication between the brain and the muscular system is severely impaired, often resulting in paralysis.
The success achieved in these clinical applications soon demonstrated that healthy individuals could also benefit from BCI systems, greatly expanding the range of potential applications.
One of the key factors behind this progress has been electroencephalography (EEG), a non-invasive, painless, and relatively inexpensive technique for recording neural activity. However, because EEG measures brain signals through the scalp at the microvolt level, the recordings are susceptible to environmental noise and physiological artifacts, which can reduce system performance.
This limitation remains one of the greatest challenges, particularly for developing reliable BCI applications intended for healthy users.
From Reading the Brain to Writing to the Brain
Driven by the belief that "Nothing is impossible—it may simply take more time," researchers have made remarkable advances in BCI technology. By implanting biocompatible microelectrode arrays directly onto or within the brain, they have succeeded in recording neural signals with exceptionally high signal-to-noise ratios.
At the same time, scientists are working to reduce the risks associated with invasive surgical procedures by developing safer and more practical hardware solutions. Recent years have witnessed significant progress toward less invasive and even minimally invasive neural interfaces.
Even more remarkably, research is no longer limited to systems that merely read information from the brain. Scientists are now developing technologies capable of writing information back into the brain. In other words, questions that once belonged solely to the realm of science fiction—such as, "Could we one day transfer knowledge, or even a foreign language, directly into the human brain?"—are increasingly being approached from a scientific perspective. While many technical and ethical challenges remain, the answer is no longer an unequivocal "impossible," but perhaps, "Why not?"
As impressive as it may appear, the brain–computer interface is far more than a single technology. It represents a multidisciplinary field that integrates neuroscience, biomedical engineering, computer science, artificial intelligence, signal processing, robotics, electronics, psychology, and ethics.
Alongside Opportunities Come Risks
So far, we have focused on the remarkable and highly beneficial aspects of BCIs. However, beneath the surface lies another side of the technology—one that presents profound ethical, social, and security challenges.
The possibility of transforming human beings into individuals who merely consume information without independent thought, or whose perception and free will could be manipulated, cannot simply be dismissed. If the brain can be influenced from the outside, then those who possess such capabilities might one day use them not only to read neural activity but also to influence thoughts, preferences, or decisions.
Just as sponsored content appears prominently in internet search results today, it is theoretically conceivable that future neurotechnologies could subtly bias certain thoughts or preferences while a person is interacting with the world. Imagine walking past a café and suddenly feeling an unusually strong desire to stop for coffee—not because of your own spontaneous decision, but because that thought had been artificially stimulated. Although such scenarios remain speculative, they illustrate the transformative power these technologies could eventually possess.
Beyond influencing individuals, broader societal manipulation may also become possible. More advanced scenarios involving cognitive influence and behavioral engineering are already being discussed in academic and ethical circles. It is equally plausible that organizations developing these technologies have already begun considering such possibilities.
These concerns make ethical governance, privacy protection, cybersecurity, and robust legal regulations more critical than ever before.
Brain–Computer Interface Research Around the World and in Türkiye
Globally, several companies are investing billions of dollars in brain–computer interface technologies. Among the most prominent are Neuralink, Synchron, and Blackrock Neurotech, each pursuing different approaches to developing next-generation neural interfaces.
In Türkiye, BCI research at Technology Readiness Levels (TRL) 6 and 7 is being conducted at the Neurophysiology Engineering Laboratory within the Medical Device Design and Manufacturing Application and Research Center (METAM) at Karadeniz Technical University.
The laboratory carries out master's and doctoral research, publishes scientific articles, develops research projects, organizes hands-on BCI training programs, and presents its findings at national and international scientific meetings.
A Technology That Will Shape the Future
One fact is undeniable: technological progress cannot be stopped—and history has shown us that it should not be.
Today, more than ever before, we must invest in scientific research, innovation, and technological development. To remain competitive in the global technology race, countries must strengthen their domestic innovation ecosystems and support pioneering research capable of generating internationally competitive technologies.
Not only in neuroscience but across every discipline shaping the future, there will be an increasing need for researchers who can understand, explain, and responsibly manage both the visible benefits and the less obvious implications of emerging technologies.
Conclusion: The Future May Be Shaped by Our Thoughts
Viewed from an optimistic perspective, brain–computer interfaces have the potential to transform numerous sectors, including healthcare, communication, transportation, defense, entertainment, and education.
The future appears destined to become far more fascinating—and far more extraordinary—than we can imagine today.
So, what do you think?
Could brain–computer interfaces become the next great invention to change the course of human history?
