All Perception is Fundamentally an Illusion

Most people who stare at the image below will believe the dark oval in the middle is growing larger. But, believe it or not, it is just an illusion – a static image.

According to a study published in the journal Frontiers in Human Neuroscience, this illusion has something to teach us about how our brains and eyes collaborate to see the world. Researchers tested the illusion on 50 men and women with normal vision and found that those participants who had eyes with the strongest pupil dilation response had the greatest response to the illusion; while those with poor dilation response could not see it.

The pupils in the human eye are designed to automatically adjust to the surrounding light, dilating when it is dark so they can capture more light, and constricting when it is bright to prevent overexposure. Even though the hole in this illusion is not darkening, the perception or expectation in our mind that it should be darkening is enough to make our pupils respond.

Bruno Laeng, a psychology professor at the University of Oslo and an author of the study, says: “There is no reason that the pupil should change [while looking at this image], because nothing is changing in the viewers world, but something clearly has changed inside the mind.”

The researchers hypothesize that the illusion is deceiving because the gradient on the central hole makes it look to the viewer as if they are entering a dark hole or tunnel, which prompts the participants’ pupils to dilate. Our brains are making assumptions about what it sees based on past experience and is trying to predict and prepare our senses for what it thinks will happen next.

It takes time for light to reach our sensory organs and send the image to our brain. The brain then takes more time to process the image, make sense of it, and decide what actions to take based on the collected information. By the time our brain catches up with the present, time has already moved forward, and the user’s environment has most likely changed.

To minimize this image collection and processing delay, the brain may be constantly trying to predict a little bit into the future so that it can better perceive the present. Being fooled by this expanding hole illusion is not a flaw of the human species, but a feature. It is most likely built up from evolutionary history to help humanity survive.

The information we get from our senses is spotty and incomplete, so the brain has evolved over time to try to guess what is happening in the uncertain and ever-changing world – and to make decisions based on what is most likely to happen next.

People who possessed brains with the best ability to adapt and predict what is happening at any given moment most likely had an advantage over those that lacked the capacity to adapt. When the illusion image is communicated to the brain, it anticipates that the body will soon be entering a dark place and it responds by telling the pupils to begin dilating (so the body will be able to react sooner in case there is danger lurking inside that black hole).

Researchers tell us that everything we perceive is inconsistent with the physical reality of the world. It is not just that the information taken in by our senses can be misunderstood, it is also that there is a universe of information available in the physical world that is imperceptible to the human senses.

Consider light itself. The light our human eyes can detect is only a sliver of the total amount of light that’s out there. The 0.0035% of the electromagnetic spectrum we can see is referred to as visible light, but the other 99.9% percent of the spectrum consisting of radio waves, microwaves, infrared radiation, ultraviolet rays, X-rays and gamma rays are all undetectable by our eyes.

Electromagnetic Light Spectrum

Humans have cone-shaped cells in our eyes that act as receivers specifically tuned to the wavelengths in the narrow visible light band of the spectrum. Other portions of the spectrum have wavelengths too large or too small and energetic for the biological limitations of our perception.

Evolution has not endowed us with the ability to see beyond the visible region of the electromagnetic spectrum; although it is possible to feel infrared radiation as heat and employ other parts of the electromagnetic spectrum for practical uses, such as X-Ray medical imaging.

But we carry on with our lives, oblivious to the huge spectrum of electromagnetic waves present all around us. Humans have managed to survive and reproduce despite our limited view. It’s a good thing that visible light was adequate to help our ancestors detect predators that would do them harm.

But imagine if our eyes were able to detect other parts of the electromagnetic spectrum — our universe would be unrecognizable. We could glean so much more visual information if we were able to see in the radio, infrared or even X-ray regions of the electromagnetic spectrum.

Bees and butterflies are examples of organisms that can detect Ultraviolet radiation. Some flowers have special markings that can only be seen in UV light. Bee and Butterfly eyes are able to view this electromagnetic radiation like lights on an airport runway, to find their way to the flower’s nectar. Snakes have special sensory organs on the front of their heads that let them ‘see’ infrared waves, which they put to use with particular effectiveness when hunting for warm-blooded prey.

Consider our sense of sound. Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz, though the upper limit in average adults is closer to 15–17 kHz (because humans lose some high-frequency sensitivity as they mature).

That range of sounds allows humans to hear many of the sounds produced in nature, but not all. Any frequency that is below the human range is known as infrasound. It is so low that it may be detected only by a creature with big ears, such as an Elephant or by specialized instruments designed by scientists to detect the low frequency sounds that precede avalanches and earthquakes. Any frequency that is above the human frequency range is known as ultrasound. Bats and Dolphins use ultrasound frequencies as high as 200,000 Hz to help them navigate via echolocation.

Most dogs can hear sound frequencies as high as 47,000 to 65,000 Hz which is far too high-pitched for humans to hear. That is why dogs can be trained to detect when their owner is about to experience a seizure. Dogs ears are also much more sensitive to loud sounds than ours, which is probably why fireworks, thunderstorms and vacuum cleaners send them scurrying for cover.

Consider our sense of smell. Humans have 396 olfactory receptors which are employed to help us pick up scents. Almost all animals, however, have a larger number of olfactory receptors than humans (rabbits have 768 olfactory receptors) which provides them with an excellent ability to smell. 

Among the animals with the greatest sense of smell are bears whose sense of smell is 300 times better than humans and is capable of detecting a deceased animal from up to 20 miles away; elephants who can smell water sources from up to 12 miles away; sharks who can smell the presence of a drop of blood in almost 100 liters of water; and bloodhounds whose sense of smell is 2,100 times better than that of a human’s and can detect trace amounts of drugs and explosives inside packages.

When you consider all these blind spots in our senses, it is obvious that humans live in a world in which many sights, sounds and smells exist that are beyond the ability of our limited senses to detect; and those that we can detect can be compromised by our overactive minds. It’s enough to make you think that all human perception is, fundamentally, just an illusion; or as Bob Dylan keenly observed “All the truth in the world adds up to one big lie“.

It could well be that we are each living in our own virtual reality world, bound by the limitations of our physical senses and the tricks employed by our minds. Dr Laeng believes we each do live in a virtual reality world. Much of what we see is an illusion, but we are not really being tricked – he believes the visual illusions help to reveal the mismatches between what our eyes see and what our mind’s eye thinks is happening.

So what lessons can we take away about how to live our lives knowing the limits of our senses and the tendency of our brains to trick us into seeing what it wants us to see.

One lesson is that we should remind ourselves that things are not always what they appear. It is possible for two people to witness the same event but still give contradictory descriptions of what they saw; even though they are certain their description of events are true. Knowing that our eyes are susceptible to being tricked should make the criminal justice system wary of judging guilt based solely on the testimony of eye-witnesses.

Another lesson is to be careful of letting our minds be swayed by our pre-conceived biases and political opinions. If we each live in our own virtual worlds then we need to be careful of falling into the trap of accepting information that matches our biases and opinions while discarding facts that don’t. If more people were careful to seek out an objective, agreed-upon, reality then maybe there would be less disagreement and discord in today’s society.

Finally, we should all be humbled and filled with wonder knowing that what our senses reveal to us is only a small portion of the great wide-world we live in. There is a whole universe out there beyond our human senses – a twilight zone if you will, a dimension not only of sight and sound but of the mind, one where there is so much more for us to discover.

We have a universe within ourselves

“Everybody has a little bit of the sun and moon in them… Everyone is part of a connected cosmic system. Part earth and sea, wind and fire, with some salt and dust swimming in them”

Suzy Kassem

Mankind has always possessed a deep curiosity about the ultimate existential questions of life: how is it that the world came to be and what forces in it led to my creation? Our ancestors, lacking scientific knowledge, made up supernatural creation stories to help them answer these questions and to explain the natural world that their limited human senses observed all around them.

Those of us living today are fortunate because we are on the threshold of becoming the 1st generation to ever know in great detail, and with some confidence, the answers to those great questions. In the past decade the results of several major observational studies have brought a level of clarity and coherence to our understanding of the universe that we have never had before.

The pace of recent cosmological discoveries has been truly breathtaking; especially considering that it was less than 500 years ago when man first learned that the earth revolved around the sun and less than 100 years ago when astronomer Edwin Hubble proved that the universe actually contained more than 1 galaxy.

Thanks to images taken by the Hubble Telescope over the last 30 years; and the first astonishing images produced by the recently launched James Webb Telescope – which sits a million miles away in space – astronomers now have the capability of looking back to the beginning of time – to see the actual birth of galaxies.

The Webb Telescope is 100 times more powerful than the Hubble, with six times more light collecting capability, enabling it to see objects in much finer detail. The increased clarity of the new images have led astronomers to increase their estimates of the number of galaxies in our universe from 200 billion to 2 trillion!

James Webb photo of galactic cluster SMACS 0723, the deepest infrared image of the distant Universe ever produced. The image covers a patch of sky approximately the size of a grain of sand held at arm’s length by someone on the ground. It reveals thousands of galaxies, some of which are as far away as 13.1 billion light years. The bluer galaxies are more mature ones, containing many stars and little dust. The redder galaxies contain more dust, from which stars are still forming. Courtesy of NASA.

What really sets the Webb Telescope apart is its ability to focus on the infrared portion of the light spectrum. Most telescopes are designed to see only the small sliver of visible light emitted by stars. The problem with the visible light spectrum is that it gets blocked by the abundant amount of dust and gas that is floating around the universe.

Infrared light is invisible to the human eye but makes up much of the light that comes our way from the universe. The infrared spectrum of light can see past all that dust and gas, which allows astronomers to look with unprecedented detail at some of the earliest and faintest celestial objects in the universe, ones that were born over 13 billion years ago.

Another incredible capability of the space telescope is its ability to detect exoplanets. An exoplanet is simply a planet that orbits a star outside our solar system. Exoplanets have been historically difficult to find because they are very far away, do not emit any light, and are typically much smaller than the stars they orbit.

But astronomers have discovered innovative indirect methods to detect these exoplanets by measuring the dimming of the light of a star that occurs as a planet passes in front of it or by monitoring the spectrum of a star for the tell-tale signs of a planet’s gravity pulling on it and causing its light to subtly Doppler shift.

Using these planet detection methods, astronomers have estimated that about 1 in 5 “sun-like” stars in the Milky Way Galaxy have an earth-sized planet located within its habitable zone. This would calculate to more than 11 billion potentially habitable Earth-sized planets in our own galaxy to discover!

Incredible as it may seem, Astronomers can detect not only the presence of an exoplanet, they can also employ powerful scientific instruments on the telescope, called spectrographs, to identify the unique signatures of specific molecules in their atmosphere.

When an exoplanet passes in front of its host star, a small fraction of the stellar light passes through the exoplanetary atmosphere, where different molecules absorb light of some wavelengths while light of other wavelengths can pass through unhindered. By measuring the fraction of stellar light able to penetrate the atmosphere at different wavelengths, the chemical composition of the atmosphere can be determined.

Turning the intensity of light measured at different wavelengths into graphical signatures allows scientists to measure the chemistry in the atmosphere of distant planets and detect the presence of water or methane molecules which, if found, could provide evidence that there is – or once was – life on the planet.

I had a passing interest in star gazing when I was a boy. I would set up my cheap telescope in my back yard and focus on different celestial objects, not really knowing what I was looking at. My interest in astronomy faded over time as I became busy with the business of life. After my retirement, however, I decided to pick up my old hobby by signing up for one of the science classes produced by the Great Courses called Cosmology: The History and Nature of our Universe. The course re-kindled my interest in the cosmos and stoked my imagination about the wonders of the universe.

Here are just a few of the the things the course covered that seem incredible to me and filled me with wonder:

We can travel back in time…

Even though Albert Einstein’s theory of relativity tells us that nothing can travel faster than the speed of light, the universe is so vast it still takes light from distant galaxies a long time to reach the earth. By observing light that originated far away we are travelling back in time to see how the Universe looked when it was younger (we can’t know for sure what distant objects in the universe look like today because their light is not yet observable to us).

Light travels at a speed of 186,282 miles per second, which equates to 5.88 trillion miles per year – which scientists define as the distance light travels in 1 light year. Light from any celestial object that is more than 5.88 trillion miles away from the earth takes more than 1 earth year to reach us. Earth’s average distance from our sun is 93 million miles, so its light only takes about 8.3 minutes to reach us.

The telescopes we have today are powerful enough to observe the first light that came from the hot glowing gas of the Big Bang itself, that moment in time approximately 14 billion years ago, when astronomers believe that our universe came into being.

The brilliant light from this hot gas is observable to scientists via what is called the cosmic microwave background and it shows astronomers a view of the Universe approximately 400,000 years after the Big Bang. Immediately after the Big Bang, the Universe was so hot that the gas was foggy and impenetrable, but as time passed expansion cooled the Universe, and after 400,000 years the temperature dropped enough for the fog to clear and for atoms to form.

So, looking outward (and back in time), our vision is limited by this bright, glowing wall of fog. As the light crosses the expanding Universe, its waves are stretched 1000-fold and arrive as microwaves. So the microwave background reveals the universe in its “pre-embryonic” state right after the Big Bang!

The Laws of the Universe are constant…

Einstein once famously said “The most incomprehensible thing about the Universe is that it is comprehensible.” How is it possible that humans could have developed the mental capacity to understand such a vast and utterly remote cosmic realm? How can something that emerged out of the atoms and evolutionary forces of Nature come to comprehend itself?

The answer is that we all are, in a sense, children of Nature. Much of the character of the universe is all around us here on earth. We’ve evolved in an astronomical setting that is itself beholden to the same laws of physics that span all of space and time. The laws of physics are the same everywhere, and there is much that is cosmic even here on Earth. For example, humans have evolved within Newtonian space and time, which is identical to 99% of cosmic space and time, and this has resulted in our ability to comprehend things like location, distance, size, light and speed.

As far as we know all objects in the universe obey the same universal laws of nature (gravity, motion, thermodynamics, electricity, energy). Because we have studied these topics here on earth for centuries, we can apply our understanding of these laws to everything we observe in the universe.

The nature of matter is constant…

Not only are the laws of physics the same throughout the universe, so is the nature of matter. As far as we know the atomic elements that make up all the matter on earth exists everywhere throughout the universe.

Us, and everything around us, are made of atoms. Atoms are incredibly tiny and numerous. There are about 100 kinds of atoms that we have discovered, each making a particular chemical element, such as hydrogen, carbon, gold, or uranium. The elements are ordered in a periodic table so that elements with similar chemical properties line up in columns.

The Thermonuclear fusion occurring inside stars causes them to become “atom factories.” The huge weight of a star makes a hot, dense core like a furnace: The star burns lightweight fuels into heavier ones. This fusion burning releases energy, which heats the core further and keeps the reactions going. Heat also moves up to the surface, which glows brightly. In the core, the ash from one reaction becomes the fuel for another.

For example, hydrogen burns to helium, which then burns to carbon, and so on. Reactions further down the sequence need ever-higher temperature, because nuclei with more protons repel more strongly. Ultimately, how far along this sequence a star gets depends on its mass; stars of higher mass
can make heavier elements.

How do these freshly made nuclei get out of the star’s core and into the matter that makes up our universe? The remarkable journey starts when the nuclei are brought to the surface in huge, hot currents of gas. On their way up, at lower temperature, the nuclei acquire their quota of electrons and become atoms. These atoms are finally ejected into space when the fuel runs out, the nuclear reactions cease and the star dies.

We are made of star stuff…

When the astronomer Carl Sagan said his famous line that each of us are made of star stuff, he was reminding people that much of the matter of our bodies was created within the stars long ago. He wanted people to know we are marvelous and our story is, too.

Modern cosmology doesn’t just deal with huge things like stars and galaxies; it must also consider the creation of atoms and the planets and people that atoms make. It is a story that takes us from the hearts of atoms to the hearts of stars, and out into the galaxy to watch the birth and death of stars and planets.

It is complemented by the the billion-year mechanism that slowly coaxes these tiny atoms into assembling plants and animals and people – and even the brain reading this sentence. We are no less a part of the Universe than any star or galaxy.

The atoms in you and me probably drifted around in the interstellar medium for 1 or 2 billion years before joining a denser cloud. Within such clouds, small pockets collapse to form stars, and around these stars, disks of dust and gas, which in turn form planets.

In the case of the Earth, some atoms ended up in a spherical ball, with a barren, cratered surface heaving with volcanism. During the next 4.5 billion years, an extraordinary transformation took place, enabled by atoms’ amazing ability to stick together and form molecules which can combine in complex ways.

It’s easy to feel small and insignificant when you consider the vastness of the universe and the timescale of celestial events, especially in comparison with our meager human lifespan. We become awestruck while looking at telescopic images and realizing that a single picture representing one minuscule sliver of the universe is filled with thousands of galaxies, each with billions or trillions of star systems and each of those with its own planets.

Deep field images like those produced by the Webb telescope show us spectacular moments frozen in time. We can see galaxies wrap around one another, colliding and tearing their dusty, star-riddled arms apart in a violent ballet. It’s no wonder that people all over the world stare in wonder at the majesty of it all.

Space exploration is one of the few things that our divided society can agree is overwhelmingly positive. It reminds us of our inherent connection with the universe, but it can also lead to feelings of a profound sense of insignificance – showing us, on a grand scale, just how small we are.

However, despite the vastness of the Universe and our small place in it, we should not feel insignificant. A diagram plotting mass versus complexity would show that living things are enormously more complex than astronomical objects. If objects shone with a brightness in proportion to their complexity, then galaxies would be dim light bulbs, while our brain alone would be a beacon of light visible across the whole Universe!

When you think about it that way, we are very special – and we should be grateful to the stars above that we are one of the most complex things the universe has ever made!

Industry is the Enemy of Melancholy

I was fortunate to retire from my traditional work career at the relatively young age of 56. Retiring early had become a goal of mine ever since I observed how much my father enjoyed his 30 year post-work life. My father was perfectly content to leave the working life behind and fill up his days with fishing, tending his vegetable garden, solving the daily crossword puzzle, taking naps and watching the home town Sports teams on his television.

When the time came for me to retire, I had an idyllic vision of spending my days in similar fashion. Finally, after 56 years, I was looking forward to being my own boss – thrilled to have the opportunity to wake up every day and do whatever it was that interested me. I believed that every day would feel like Christmas!

And those first few months of retirement really were magical. Gone was the stress of having to be available 24/7 to my company’s sales and management teams who were battling to close million dollar deals, gone was the daily 3 to 4 hour commute in bumper-to-bumper traffic, and gone was the chronic sleep deficit.

It was goodbye to all that. What replaced it was the pleasure of deciding which book to read from my list of “books I always wanted to read“, fly fishing in the beautiful rivers of New England, taking long rides on my electric bike, spending quality time with my grandkids, and attending stimulating concerts and plays with my wife.

Something begin to happen, however, that I was not expecting about six months into my retirement. As the novelty and thrill of being retired began to subside I began to notice that I was experiencing melancholy moods and moments of soul searching. I was spending time reflecting on topics like past loss, the certainty of my physical and mental decline, and the uncertainty of how future generations will deal with the big existential challenges the world is facing.

Without the rigors of work to occupy my attention, my mind was set free to wander where it wanted to go and to my surprise I discovered that it often wanted to contemplate dark and doleful topics. I was not that concerned about these sometime melancholy moods because I reasoned that it is one of life’s natural reactions to harbor feelings of both happiness and sadness; and I remembered the wise old grandmother who once said: “A good day is a laugh and a cry“. Still I wondered why my pensive thoughts were increasing in frequency at a time in my life when I expected to be most content.

Then I happened to read about a study conducted by Harvard psychologists Matthew A. Killingsworth and Daniel Gilbert which could help to explain the phenomenon I was experiencing. These researchers developed a smartphone app that allowed them to collect the thoughts, feelings, and actions of a broad range of people at random moments as they went about their daily activities.

Using the app, Killingsworth and Gilbert asked people what they were doing and how happy they were while doing it. They sifted through 25,000 responses from more than 5000 people and reported that 46% of the people were thinking about things other than what they were actually doing at the time (in other words, they were daydreaming about something other than what they were doing). They discovered that those people who were daydreaming typically were not happy; while those who were fully engaged in their activity were the happiest. 

The researchers wrote that unlike other animals, human beings spend a lot of time thinking about what is not going on around them, contemplating instead events that happened in the past, might happen in the future, or will never happen at all. This “stimulus-independent thought” or “mind wandering” appears to be the brain’s default mode of operation.

Although this ability is a remarkable evolutionary achievement that allows people to learn, reason, and plan, it apparently comes with an emotional cost. “We see evidence that a human mind is a wandering mind, and a wandering mind is an unhappy mind,” they said in their report. The bottom line is that we’re more likely to think negative thoughts when we let our minds wander.

Maybe that is why people who are waiting in line or stuck in traffic appear to be more irritable. And maybe my melancholy moods have increased in frequency since leaving work simply because my mind is no longer required to spend 10+ hours a day focused on the demands of my job.

This study confirms that many philosophical and religious traditions are on to something true when they teach that happiness is to be found by living in the moment, and by training their practitioners to resist mind wandering and concentrate on the here and now. Yoga teachers and those teaching meditation practices usually stress the importance of “mindfulness” or “being present” for a good reason — because when we do, it usually puts us in a better mood.

When I look back at my work career, I can see now that those moments when I felt most fulfilled was when I was in the middle of product development activities, being part of a team inventing electronic test solutions to solve complex manufacturing challenges. During those moments all the powers of my mind were fully engaged in solving the problem at hand and there was a sense that the results of the team’s collective work would have a positive impact on the company, our customers, and to a certain extent, society in general.

William F. Buckley put his finger on the unique ability that meaningful work has in preventing the onset of depressive feelings when he wrote “Industry is the enemy of Melancholy“. Simply put, if we are busy doing work that requires a focused mind it becomes difficult for the mind to wander and contemplate spirit dampening topics that are likely to cause the blues.

I happened to listen to an online homily about work that touched on a similar theme from a spiritual point of view that was given by Bishop Robert Barron. Bishop Barron made the point that our very being is deeply influenced by our actions and that the kind of work we do has a lot to do with the kind of people we become.

People who have no work usually struggle with depression because our sense of dignity often comes from work. Those who suffer from unemployment feel not just the financial burden of a lost paycheck, but also the loss of dignity brought about from the loss of their livelihood.

When you are feeling down one of the things psychologists recommend is to get to work on a project. It tends to make you feel better because work engages the powers of mind, will, creativity, and imagination and we become awakened when we give ourselves over to a project.

It doesn’t have to be a grand or complicated project. In fact, Bishop Barron mentioned that he found that one of the things that brings him the most satisfaction is doing the dishes. His day is usually filled with meetings and intellectual activities, so it is a relief for him to do some simple physical work at the end of the day. It brings him satisfaction to make order out of a dirty kitchen and to see everything clean and in its place when he is done.

The Bishop referenced this lyric from Bob Dylan’s song “Forever Young” to emphasize that work is a blessing and that souls can not fully prosper when their hands and feet are idle.

“May your hands always be busy, may your feet always be swift, may you have a strong foundation when the winds of changes shift”

Bob Dylan; Forever Young

Not all work is physical, though. Pope John Paul II categorized different kinds of work for the faithful. There is physical work (the work of the body), intellectual work (the work of the mind), spiritual work (the feeding of one’s soul), and moral work (charitable work on behalf of the poor and mistreated). When we are attentive to each of these categories of work in our daily life, it is then that we best fulfill our divine potential and become collaborators with the purpose of God.

I like that idea. May we all come to see our work, in all its different manifestations, as collaborating with the purpose of God and as bringing us into a more perfect union with a higher power.