Science
Monday, October 19, 2026
Discoveries · Innovations · Research
Technology that controls the brain awarded a Nobel
The Nobel Prize in Physiology or Medicine for 2026 was awarded to Karl Deisseroth, Peter Hegemann and Georg Nagel for discoveries that enabled the development of optogenetics, a technology that uses light to control neuronal activity.
The Nobel Assembly at the Karolinska Institute announced that the discoveries of the three scientists have created new opportunities to study how the brain works, allowing researchers to activate or inhibit specific neurons within milliseconds.
Optogenetics combines genetics with the use of light. Through light-sensitive proteins known as opsins, scientists can influence the electrical activity of nerve cells. This enables them to control neuronal activity on the millisecond scale.
The road to this technology began with the study of organisms that respond to light. Peter Hegemann and Georg Nagel played a decisive role in the discovery and characterization of channelrhodopsins, proteins that act as light-activated ion channels.
When exposed to appropriate light, these proteins open channels in the cell membrane and alter ion flow, affecting its electrical signals.
Karl Deisseroth and his collaborators later demonstrated that these mechanisms can be used to control neurons. By introducing light-sensitive proteins into nerve cells, researchers can activate them with light pulses.
This method gave neuroscientists a new tool to determine not only which parts of the brain are activated during a given process, but also whether the activity of a specific group of neurons causes a particular behavior or response.
In this way, researchers can activate or inhibit specific neural circuits and observe almost immediate effects on movement, perception, memory, emotions, and behavior.
The technology has become one of the most important tools of modern neuroscience and is used in laboratories worldwide to understand the organization and function of neural circuits.
Beyond its importance for basic research, optogenetics has also opened possibilities for developing new methods against neurological diseases and for restoring lost functions of the nervous system. However, many of the potential therapeutic applications remain in the research phase.
The discoveries of Deisseroth, Hegemann and Nagel have changed how scientists can study the brain: from observing neuronal activity to directly and precisely intervening in their activity using light.
Source: Nobel Prize
The Nobel Assembly at the Karolinska Institute announced that the discoveries of the three scientists have created new opportunities to study how the brain works, allowing researchers to activate or inhibit specific neurons within milliseconds.
Optogenetics combines genetics with the use of light. Through light-sensitive proteins known as opsins, scientists can influence the electrical activity of nerve cells. This enables them to control neuronal activity on the millisecond scale.
The road to this technology began with the study of organisms that respond to light. Peter Hegemann and Georg Nagel played a decisive role in the discovery and characterization of channelrhodopsins, proteins that act as light-activated ion channels.
When exposed to appropriate light, these proteins open channels in the cell membrane and alter ion flow, affecting its electrical signals.
Karl Deisseroth and his collaborators later demonstrated that these mechanisms can be used to control neurons. By introducing light-sensitive proteins into nerve cells, researchers can activate them with light pulses.
This method gave neuroscientists a new tool to determine not only which parts of the brain are activated during a given process, but also whether the activity of a specific group of neurons causes a particular behavior or response.
In this way, researchers can activate or inhibit specific neural circuits and observe almost immediate effects on movement, perception, memory, emotions, and behavior.
The technology has become one of the most important tools of modern neuroscience and is used in laboratories worldwide to understand the organization and function of neural circuits.
Beyond its importance for basic research, optogenetics has also opened possibilities for developing new methods against neurological diseases and for restoring lost functions of the nervous system. However, many of the potential therapeutic applications remain in the research phase.
The discoveries of Deisseroth, Hegemann and Nagel have changed how scientists can study the brain: from observing neuronal activity to directly and precisely intervening in their activity using light.
Source: Nobel Prize
Ad space
When Intense Light ‘Ignites’ the Brain’s Electrical Activity
Every second, the human brain converts the surrounding world into electrical language. One of the clearest examples of this process is vision itself. What we call “light” is not initially experienced by the brain as brightness or color — it is transformed into electrical activity the moment it reaches the retina.
This has led scientists and neurologists to study an important question: what happens when the brain is exposed to intense and continuous light for long periods of time?
Retina: The Brain’s Biological Electrical Converter
The eye is not simply a camera. The retina functions more like a living neural sensor directly connected to the brain.
Inside the retina are specialized cells called rods and cones, whose role is to detect photons (particles of light) and convert them into electrochemical signals through a process known as phototransduction.
These signals are then transmitted through the optic nerve to the central nervous system. The brain never actually “sees” light directly. It experiences electrical interpretations of it.
Continuous Light Means Continuous Neural Activity
Under normal conditions, this system functions continuously and efficiently. However, exposure to very bright or uninterrupted light increases the workload on the neural pathways of both the retina and the brain.
Intense light increases the firing frequency of neurons, stimulates alertness and wakefulness systems, activates the autonomic nervous system, reduces melatonin production, affects circadian rhythm, and increases metabolic demand in the brain’s visual regions.
For this reason, prolonged exposure to intense light can overstimulate the nervous system and trigger symptoms such as mental overload, headaches, visual fatigue, irritability, insomnia, dizziness, exhaustion, and heightened sensory sensitivity.
Many people describe this as a sensation of the brain being “electrified,” but the actual mechanism involves ion exchange, neurotransmitters, and synchronized neural signaling.
Why Some Brains React More Strongly
Not every nervous system tolerates intense light in the same way.
In certain conditions, intense light can overstimulate already sensitive neural pathways. Researchers believe this is linked to hyperactivity of the visual cortex, trigeminal pain pathways, the autonomic nervous system, and inflammatory signaling.
Light sensitivity is a common symptom in many neurological and neuro-ocular conditions. In migraine, intense light can trigger or worsen pain through overstimulation of visual and trigeminal pathways in the brain. In traumatic brain injury, the brain often becomes more sensitive to sensory stimuli after trauma, causing bright light to provoke mental fatigue, dizziness, or headaches.
Inflammatory conditions such as encephalitis and meningitis may cause severe photophobia due to irritation of neural structures and hypersensitivity of the central nervous system. Even dry eye syndrome, although primarily ocular, continuously sends irritation signals to the brain, increasing sensitivity to light.
In epilepsy, particularly photosensitive epilepsy, flashing or intense light can trigger excessive synchronized electrical activity in the brain, potentially provoking neurological episodes or seizures.
Scientifically, intense light does not “shock” the brain with electricity. However, it forces the nervous system to continuously generate electrochemical activity through visual pathways and alertness mechanisms.
Continuous and intense light forces the brain into persistent electrical signaling from the retina to the cortex, overstimulating sensitive neural systems.
This has led scientists and neurologists to study an important question: what happens when the brain is exposed to intense and continuous light for long periods of time?
Retina: The Brain’s Biological Electrical Converter
The eye is not simply a camera. The retina functions more like a living neural sensor directly connected to the brain.
Inside the retina are specialized cells called rods and cones, whose role is to detect photons (particles of light) and convert them into electrochemical signals through a process known as phototransduction.
These signals are then transmitted through the optic nerve to the central nervous system. The brain never actually “sees” light directly. It experiences electrical interpretations of it.
Continuous Light Means Continuous Neural Activity
Under normal conditions, this system functions continuously and efficiently. However, exposure to very bright or uninterrupted light increases the workload on the neural pathways of both the retina and the brain.
Intense light increases the firing frequency of neurons, stimulates alertness and wakefulness systems, activates the autonomic nervous system, reduces melatonin production, affects circadian rhythm, and increases metabolic demand in the brain’s visual regions.
For this reason, prolonged exposure to intense light can overstimulate the nervous system and trigger symptoms such as mental overload, headaches, visual fatigue, irritability, insomnia, dizziness, exhaustion, and heightened sensory sensitivity.
Many people describe this as a sensation of the brain being “electrified,” but the actual mechanism involves ion exchange, neurotransmitters, and synchronized neural signaling.
Why Some Brains React More Strongly
Not every nervous system tolerates intense light in the same way.
In certain conditions, intense light can overstimulate already sensitive neural pathways. Researchers believe this is linked to hyperactivity of the visual cortex, trigeminal pain pathways, the autonomic nervous system, and inflammatory signaling.
Light sensitivity is a common symptom in many neurological and neuro-ocular conditions. In migraine, intense light can trigger or worsen pain through overstimulation of visual and trigeminal pathways in the brain. In traumatic brain injury, the brain often becomes more sensitive to sensory stimuli after trauma, causing bright light to provoke mental fatigue, dizziness, or headaches.
Inflammatory conditions such as encephalitis and meningitis may cause severe photophobia due to irritation of neural structures and hypersensitivity of the central nervous system. Even dry eye syndrome, although primarily ocular, continuously sends irritation signals to the brain, increasing sensitivity to light.
In epilepsy, particularly photosensitive epilepsy, flashing or intense light can trigger excessive synchronized electrical activity in the brain, potentially provoking neurological episodes or seizures.
Scientifically, intense light does not “shock” the brain with electricity. However, it forces the nervous system to continuously generate electrochemical activity through visual pathways and alertness mechanisms.
Continuous and intense light forces the brain into persistent electrical signaling from the retina to the cortex, overstimulating sensitive neural systems.
In this section
Science
Elon Musk's Neuralink restores paralyzed patient's voice through artificial intelligence
Brad Smith, the third patient to receive a Neuralink brain implant and the first with amyotrophic lateral sclerosis (ALS), has reached a milestone: he can now communicate solely through his thoughts. Although he is nonverbal and uses a ventilator to breathe, Smith controls a computer with his mind, types, navigates apps and even speaks using a version of his voice cloned through artificial intelligence.
Neuralink's implant, called "Link," consists of 1,024 electrodes connected by very thin wires that are inserted into the motor cortex of the brain. The device connects to a MacBook Pro via Bluetooth, and by training the system to recognize neural signals, Smith has created personalized tools like a virtual keyboard and shortcuts for faster communication. To improve his typing speed, he has collaborated with Neuralink to develop a chat app that uses AI to suggest ready-made responses, which he selects simply by thinking. Notably, the AI-generated voice is based on recordings made before Smith lost the ability to speak, giving his communication a more personal feel. This development marks a major step forward for brain-computer interface technologies and opens up new horizons for helping people with severe motor disorders, offering them a new and more dignified way to interact with the world. Neuralink, the company founded by Elon Musk in 2016, aims to develop direct interfaces between the human brain and electronic devices. Through innovations in the miniaturization of electrodes and robotic surgeries, Neuralink aims not only to help patients with neurological disorders, but also to combine artificial intelligence with human intelligence in the future. The “Link” implant project is the first concrete step towards realizing this ambitious vision.
Neuralink's implant, called "Link," consists of 1,024 electrodes connected by very thin wires that are inserted into the motor cortex of the brain. The device connects to a MacBook Pro via Bluetooth, and by training the system to recognize neural signals, Smith has created personalized tools like a virtual keyboard and shortcuts for faster communication. To improve his typing speed, he has collaborated with Neuralink to develop a chat app that uses AI to suggest ready-made responses, which he selects simply by thinking. Notably, the AI-generated voice is based on recordings made before Smith lost the ability to speak, giving his communication a more personal feel. This development marks a major step forward for brain-computer interface technologies and opens up new horizons for helping people with severe motor disorders, offering them a new and more dignified way to interact with the world. Neuralink, the company founded by Elon Musk in 2016, aims to develop direct interfaces between the human brain and electronic devices. Through innovations in the miniaturization of electrodes and robotic surgeries, Neuralink aims not only to help patients with neurological disorders, but also to combine artificial intelligence with human intelligence in the future. The “Link” implant project is the first concrete step towards realizing this ambitious vision.
Science
Insomnia Linked to Development of Alzheimer's, According to New Research
A recent scientific study has found a strong link between lack of sleep and an increased risk of developing Alzheimer's. People who sleep less than 6 hours a night, especially in middle age, have a greater chance of developing dementia later in life. Deep sleep and the REM phase are essential for clearing the brain of toxic proteins such as beta-amyloid, which is closely linked to the development of Alzheimer's.
A single night without enough sleep can cause a sudden increase in levels of beta-amyloid in the brain. This protein forms plaques that damage nerve cells and affect memory and other cognitive functions. Furthermore, people who enter REM sleep late may be in the early stages of neurodegenerative disorders, even before classic symptoms appear.
For this reason, experts recommend that sleep be treated as a priority for maintaining brain health. Regular sleep schedules, avoiding electronic devices before bed, and creating a quiet environment are simple but powerful steps to protect the brain from long-term damage.
A single night without enough sleep can cause a sudden increase in levels of beta-amyloid in the brain. This protein forms plaques that damage nerve cells and affect memory and other cognitive functions. Furthermore, people who enter REM sleep late may be in the early stages of neurodegenerative disorders, even before classic symptoms appear.
For this reason, experts recommend that sleep be treated as a priority for maintaining brain health. Regular sleep schedules, avoiding electronic devices before bed, and creating a quiet environment are simple but powerful steps to protect the brain from long-term damage.