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Human biology has been thoroughly explored, yet the capabilities of our eyes still manage to surprise even the experts. While adults struggle to perceive their full environment, some children possess vision akin to dolphins. Humans can even see things that are invisible or be deceived by their eyes, missing things right in front of them.
10. Creative Minds Perceive the World in Unique Ways
Creativity can be understood as the ability to recognize endless possibilities. A more technical term for it is 'openness to experience.' This openness allows creative individuals to extract more information and innovative ideas from an object or concept than the average person.
In 2017, researchers sought to explore if there was a physical factor driving creativity. This trait was undoubtedly both emotional and mental, and could even be nurtured. To test whether creativity had a physical foundation, they gathered a group of volunteers and had them look at different colors. Specifically, the participants were asked to observe a green patch on the left and a red one on the right simultaneously.
Interestingly, individuals who lack creativity would often switch their attention between the two colors or briefly experience a blending of them. People with greater openness, however, tended to see the blend more frequently and for longer periods of time. This strongly suggested that creative individuals perceive the world in a fundamentally different way, in a physical sense that goes beyond emotional and mental artistic inspiration. Additional tests also revealed that creative people notice details that others often overlook, even when they're directly staring at something.
9. The Blind Experience More Nightmares
Can blind people see in their dreams? Yes, but only those who lost their sight later in life. Intriguingly, those born blind also experience nightmares, but their dreams consist of emotions, sounds, and sensations, rather than visual elements.
A recent study brought together volunteers from three different groups to investigate dreams. The first group was born blind, the second group lost their sight later in life, and the final group had normal vision. While anxiety is known to trigger nightmares, none of the participants had more anxiety than others. Despite this, a significant difference was observed: the majority of nightmares occurred when the sight-impaired individuals went to sleep.
The group born blind experienced the most nightmares (around 25 percent of their dreams), while the sight-impaired group showed a peculiar decline in visual content. The longer they had been blind, the fewer visuals appeared in their nightmares. However, the frequency of unpleasant dreams remained higher for them compared to those with normal vision.
The study reinforced the idea that nightmares are closely tied to our waking experiences. After all, when someone must move through life in complete darkness, they develop an increased awareness of potential threats and heightened feelings of vulnerability.
8. Babies Perceive Everything Around Them
Infants are able to see the world in its entirety, unlike adults who lose the capacity to notice every single detail. Adults can no longer see all the lines, cracks, and hairs in their visual field, but there’s a reason for that. Noticing every minute detail would cause sensory overload. Babies, however, need to observe everything because their world is brand new, and their brains are still determining what’s important and what can be ignored.
In 2016, Japanese researchers showed infants pictures of snails. Previous studies had already confirmed that babies tend to stare longer at new things, so the scientists used this knowledge to test whether infants could see differences that adults no longer noticed. The images appeared similar to adult volunteers, but the researchers knew which ones had subtle distinctions—and the babies found them.
This ability was most noticeable in babies aged three to four months. However, this unusual attention to detail seemed to fade between five and eight months. By that age, the infant brain learns to filter out certain things and starts focusing on more significant details, like recognizing their mother’s face.
7. Children with Dolphin-Like Vision
The Moken are a group of nomadic sea-dwellers living along Thailand’s coastlines and the Andaman Sea. While adults use spears to hunt, the children dive to gather food, and their remarkable ability to effortlessly find sea cucumbers and clams sparked curiosity. What caught scientists’ attention was that Moken children were able to navigate underwater without squinting.
To investigate further, the researchers enlisted European children vacationing in the area and Moken volunteers. After several tests, it became clear that the local children could see underwater with crystal clarity, whereas the Europeans saw nothing but blur. Astonishingly, the Moken divers taught the visitors how to do it, but when asked, the European kids couldn’t explain how they managed—it was simply that they ‘saw better.’
This discovery led to physical examinations. In a surprising twist, the Moken could adjust the shape of their eye lenses and make their pupils shrink, thus eliminating the blurry vision that others typically experience underwater. This remarkable ability has only been observed in dolphins and seals. The mechanism behind it, or why it fades as they grow older, remains a mystery.
6. The Woman Who Sees 100 Million Colors
The human eye is remarkably skilled at differentiating between shades, enabling the average person to distinguish up to 1 million colors. Even those with color blindness can perceive around 100,000 different hues. The extreme end of this spectrum was uncovered in 2007 when neuroscientists discovered a woman who could see a staggering 100 million colors.
The unidentified doctor from the UK was a “tetrachromat.” She was born with an extra cone cell in her eye, giving her the ability to see a wider range of colors. Individuals with this additional fourth cone are so rare that it took researchers 25 years to find and confirm her as a genuine tetrachromat. Their existence has been speculated since the 1980s, and her color perception was mathematically calculated.
A few more women were later identified with this ability, but no one knows exactly how many tetrachromats exist or why it appears to be a trait exclusive to females. Why don’t these women, who represent about 12 percent of the population, reveal their condition? Scientists speculate that many true tetrachromats are unaware of their gift because they never use their extra cone. This could be because the world’s color usage is designed for “normal” vision, potentially deactivating the ability.
5. Motion-Induced Blindness
The human eye functions much like a camera with a slow shutter speed, which causes moving objects to leave streaks in our vision. To protect us from these distracting streaks, the brain triggers a phenomenon known as motion-induced blindness. Typically, this phenomenon blurs the lines, but it can also make stationary objects disappear when they are obscured by moving ones. For example, a fire hydrant may be visible one moment, but as a car drives by at night and the brain removes the streaks of the taillights, the hydrant vanishes from sight.
This intriguing illusion doesn’t indicate a major flaw in our vision. Humans evolved to be highly sensitive to movement—both predators and prey needed to be spotted quickly in order to survive, and neither tended to stay still. As a result, scientists believe that motion-induced blindness evolved to help us focus on what’s moving, sharpening our perception of moving objects while simultaneously blurring out stationary ones that aren’t relevant at that moment.
4. The Unexpected Discovery of BARM
When researchers in Germany tested a group of volunteers, they were largely expecting their findings to confirm an old hypothesis. The study was designed to definitively prove the connection between blinking and tOKN, an automatic reflex that’s a well-established part of our eye’s function. Supposedly, this reflex resets the eye muscles when a person looks at a rotating object, preventing the muscles from overcompensating.
However, the 2016 study uncovered something entirely unexpected—a previously unknown eye movement was responsible for resetting the muscles. Because this movement occurred automatically with every blink, it was named blink-associated resetting movement (BARM). While the connection to tOKN was confirmed, it was also through this that BARM was discovered.
As the volunteers observed rotating objects, tOKN frequently occurred, but the eye muscles’ movement became inefficient. They twisted to a maximum limit of three to eight degrees of rotation. At that point, BARM activated and completely untwisted the muscles.
3. The Eye Detects Patterns Beyond the Brain’s Capability
At first glance, it seems like the brain would always outperform the eyeball. After all, the eyes are designed to see, whereas gray matter has many other functions. However, the eyes outshine the brain in one unexpected way, leaving even experts surprised.
Enter ghost images—random patterns embedded within other images. Previously, it was believed that only computers had the capability to detect these hidden images. But in 2018, the complex calculations required to uncover these ghost images were found in the human eye. While the brain fails to notice these hidden patterns, the eye picks them up, processes the information, and pieces it all together.
This may not seem particularly impressive until you understand the complexity of ghost images. Creating one is like taking a photograph in reverse, with a laser scanning multiple points on the surface to reconstruct the image. Similarly, the eye captures the light points reflecting off a ghost image and uses them to form a coherent picture.
2. We Can See Infrared Light
Open any science textbook, and it will tell you that humans cannot perceive certain wavelengths, such as radio waves, X-rays, ultraviolet, and infrared light. However, it turns out those textbooks are outdated. In 2014, scientists discovered that humans can actually detect infrared light.
The discovery came when several researchers reported seeing green flashes while working with infrared lasers. These flashes were not like the lasers depicted in movies or boardroom presentations—infrared lasers are supposed to be invisible.
To explore the unexpected possibility of perceiving light in the invisible spectrum, an international research team examined the eye cells of mice and humans. During the experiments, they exposed different areas to infrared light pulses. The results were astonishing. The human retina could detect this wavelength when exposed to a particularly intense dose of infrared energy. The concentrated light particles expanded the retina’s visual spectrum, allowing the human eye to temporarily perceive light beyond the visible range.
1. There Are People Who Can See Calendars
We all recognize a calendar—just glance at the wall, and there it is, a square-shaped paper filled with blocks and dates. But a small fraction of the population—around 1 percent—can actually visualize a calendar in their mind. While most people need an external source to view a calendar, these individuals can see a vivid grid of dates and days, even those far in the future.
This phenomenon is known as “calendar synaesthesia.” Hearing people recount their experiences with this ability is truly captivating. One woman described seeing the months unfold in a V-shaped pattern. Another’s calendar appeared as a massive ring, with December always passing through her body, no matter the time of year.
Both women provided compelling evidence that this wasn’t just a mental image. In 2016, they participated in tests designed to challenge their claims. If they were truly seeing calendars, the ability would withstand scrutiny. Not only did they pass the tests with ease, but their results also became the first direct proof that calendar synaesthesia isn’t a mental trick, but a phenomenon rooted in the brain. Similar to other synaesthetes who might taste words or hear colors, their brains activated multiple sensory and neurological pathways to create a tangible experience—seeing a real calendar.
