Tag: encyclopaedia

Posted in Psychology & Medicine

Tetrachromacy

Posted on by Jinavie

They say that human imagination is infinite and limitless. But consider this: can you imagine a colour outside of the visible spectrum? Most likely, you are incapable of thinking of a new colour that cannot be mapped on a standard colour chart. Interestingly, a small proportion of people can see and understand colours beyond the range that the majority of us can see.

The physiology of vision is rather complex, but essentially boils down to the retina (inside lining of the eyeball) acting as a film for the image that you see. Cells known as photoreceptors convert the visual image into electrical signals that are transmitted to the occipital lobe of the brain via the optic nerve. There are two types of photoreceptors: rod cells, which sense movement, and cone cells, which sense colour and provide sharp images (visual acuity). Human beings typically see colour by combining three primary colours: red, green and blue (known as the RGB system). There are cone cells for each primary colour. The brain processes the signals sent by each cone cells and figures out what “colour” you are seeing. Therefore, you can only perceive colours made from a combination of red, green and blue. It is easy to visualise this by playing with colour palettes on computer programs such as Photoshop.

In recent years, it has been speculated that a certain percentage of women have an extra type of cone cell that senses a different wavelength of light. Ergo, they can theoretically sense a greater range of colours compared to someone who has three types of cone cells. This condition is called tetrachromacy (“four colours”). Tetrachromacy is the opposite to colour blindness, which is caused by a deficiency or fault in one or two types of cone cells. To these people, the average person (a trichromat) will appear “colour blind”.

According to one estimate, as many as 12% of women are tetrachromats. Although there are many theoretical barriers to true tetrachromacy, there have been several documented cases of women who perceive colour in much more depth.

The ability to see an extra primary colour is more significant than just a 25% increase in the person’s colour range. An average person can see about 1 million different hues (shades of colours), while a true tetrachromat can see 100 million hues – a hundred-fold increase in the range of colours they can see. One can only wonder what kind of amazing sights a tetrachromat sees when she gazes upon a field of flowers or even a rainbow. Unfortunately, even if a tetrachromat tried to explain the colours she saw to us, we would not be able to grasp the colours as our minds would be incapable of visualising the colours, much like how describing the colour red to a blind person is impossible.

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Posted in Life & Happiness

Simple Pleasures

Posted on by Jinavie

Consider this theory. People feel happy when they experience an upturn in life. A hungry person is happy when he receives food, a poor person is happy when she earns money, and a person seeking love is happy when they find love. But as people are highly adaptable creatures, they become used to such upturns very quickly. Even the happiness brought on by great food and luxurious lifestyles tend to fade over time, and the love between a couple who act like they cannot live without each other will eventually die away. To remedy this, people always seek excitement that will create an upturn in life, giving them happiness. This causes them to adventure, seek new experiences and sometimes make dangerous, risky decisions.

Everyone has a point in their lives that could be called the “peak”. But no matter how tall the peak is, as people will adapt to it soon, the height itself does not matter. What matters is the path to the peak. For example, if someone experiences their peak in life too early, every moment from then on will seem worse than the past. The person will continuously face disappointment and reminiscence the good times. The reason being, no upturn can beat the peak that they experienced, meaning they cannot feel the happiness of an upturn in life. According to this theory, the key to a happy life is delaying this peak as much as possible. When life is starting to get boring and dull, add just a little sprinkle of greatness in your life to continuously infuse it with happiness.

However, life is not as predictable and controllable as we want it to be, making this theory highly implausible. But the theory is not completely wrong. Although it is near impossible to artificially add little upturns throughout life, it is extremely easy to “feel” an upturn. All you need to do is change your perspective. The difference between a happy person and a miserable person is that the former finds joy in the smallest things. A miserable person will feel bored unless something exciting is happening, but a happy person leads what appears to be a boring life while enjoying every minute of it. Enjoying a warm cup of coffee on a rainy day, being astounded by the beautiful sky, smelling the roses on the path, singing and dancing when no one is looking… Finding and enjoying the simple pleasures of life is the most important skill one can have in life.

Who would you rather be: a miserable person who always seeks excitement and thrills or a happy person who enjoys a “boring” life?

Posted in Science & Nature

Wave

Posted on by Jinavie

One of the joys of going to a beach is listening to the breaking of waves. Waves are typically associated with the ocean, but can also form on lakes, rivers, canals or any body of water with a free surface. 

Waves are caused by wind blowing over the water surface, dragging it in a certain direction. As the wind only affects the surface, the water below rises to fill the space, causing a circular movement. This appears as a wave on the surface. The faster the wind blows, the more the surface is shifted and the bigger the waves become. Other factors that determine the wave size are: water depth, distance of water that the wind blows over (fetch), the width of the area of the fetch and the duration the wind blows over the area. Because of these factors, some lakes may be as wavy as the sea while others are completely tepid.

The waves formed by the wind merge to form bigger waves in the ocean. The resulting wave is known as a swell. When the swell reaches the shore, the depth of the water reduces, causing the wave to rise in height and become steeper. If the wave is high enough, the base becomes unstable and the wave collapses, which is what causes waves to break.

Although it sounds like a simple process, the consequences can be deadly. Wind waves can reach heights above 30m given that the conditions are right (usually during extremely serious storms). Such a wave can flip a cruise ship with ease like a rubber toy.

Posted in Psychology & Medicine

Berry Aneurysm

Posted on by Jinavie

Stroke is a disease often associated with the elderly, but this is not necessarily true. As much as 5% of the population carry a ticking time bomb in their brain, known as a berry aneurysm. An aneurysm is a weakening of the arterial wall, causing a localised ballooning of the vessel. A berry aneurysm is a common type of aneurysm where the ballooning resembles a berry. What is most troubling is that a large proportion of these aneurysms can present very early (usually congenital, meaning you are born with it), with one research suggesting that 1.3% of the population in the age group of 20 to 39 has a berry aneurysm. If this berry aneurysm was to burst, no matter how young and fit you are, you will bleed into the area around your brain (subarachnoid haemorrhage), suddenly develop a severe, crippling headache (“thunderclap headache”), become confused, show signs of stroke such as speech or movement problems, or simply drop dead.

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Fortunately, only 10% of people carrying a berry aneurysm suffer a ruptured aneurysm and subsequent brain bleed. The other 90% will carry on living their lives, without ever knowing that they had a time bomb in their brain.

Certain factors make the risk of the aneurysm bursting go up, such as high blood pressure, which can be caused by a stressful lifestyle or smoking. But in some cases, as explained above, even a healthy teenager could suddenly drop to the ground with a massive brain haemorrhage.

Berry aneurysms are only one of many ways death could strike unnoticed, no matter how young you may be. You could live a long and healthy life and die peacefully in your sleep when you are 90 years old, or you may have a stroke and drop dead in a few minutes’ time. For all you know, a bus might run you over tomorrow, with no warning whatsoever. Ergo, youth is not an excuse to waste the day you are given. You do not have to achieve something great, or be productive, but at least spend your day knowing that you are doing everything in your power to make yourself happy, without harming your health, your future or other people.

Carpe diem. Seize the day.

Posted in Philosophy

Carpe Diem

Posted on by Jinavie

Countless teenagers claim that “you only live once” and use that as an excuse to live a reckless, risky life. Although most adults have the sense to recognise how idiotic and juvenile that sounds, it seems that they live their life as if there is only one chance as well. Too many people give up everything after a big failure messes up their lives, thinking that their life is “over”. For example, if a person has trained to become a mechanical engineer and one day has an accident that prevents them from ever working as an engineer again, the most common response is to fall into a pit of despair. They believe that they are only trained to do the one thing, and not doing it contradicts their life entirely. They are afraid that their life is over – that they are “dead”.

According to a certain statistic, we are capable of learning and mastering something new in 7 years. This means that between the ages of 11 and 88, you have no less than 11 opportunities to be great at something. Ergo, even if one “life” is over, you still have 10 opportunities to start a new life. Some people are too afraid to let one of their lives die and cling to the past, never moving forward to live on. But you have many lives. You do not live once.

Spend a life writing poems, spend a life building things. Spend a life looking for facts, spend a life looking for truth. Be a doctor, a musician, a detective, a chef, a businessman or a wanderer. No life is wasted as long as you are doing what you truly want, while not hurting yourself or others. Never forget that you have numerous lifetimes that are waiting to be seized by you. There will be times in life when you are hit with misfortune, when your life seems to crumbling around you. But that is just life. Realise that you still have the chance to start anew. And in the meantime, enjoy the lifetime you are living. Seize the day, and all the other lifetimes that are lying ahead of you.

Carpe diem.

(Idea and image from: http://www.smbc-comics.com/index.php?db=comics&id=2722#comic)

Posted in Science & Nature

Dihydrogen Monoxide

Posted on by Jinavie

Many people know about the dangers of chemicals such as lead and dioxin, but there is lack of awareness of an even bigger killed chemical: dihydrogen monoxide. It is a colourless, odourless, tasteless chemical that is responsible for the death of hundreds of thousands of people around the world.

Most deaths caused by dihydrogen monoxide (DHMO) are by accidental inhalation, causing cerebral hypoxia. However, the dangers of DHMO do not end there. Its solid form can cause severe tissue damage after prolonged exposure, and both its gas and liquid forms can cause severe burns. It is possible to overdose on DHMO, with symptoms ranging from excessive diaphoresis and micturition, bloating, nausea, vomiting and body electrolyte imbalance such as hyponatraemia. For those who are dependent on it, withdrawal means certain death. DHMO has also been found in various types of tumours biopsied from terminal cancer patients.

Not only does DHMO have consequences on human health, it is also damaging for the environment. DHMO is the leading cause of the greenhouse effect (surpassing carbon dioxide), a key component of acid rain, accelerated corrosion and rusting of many metals and contributes to the erosion of natural landscapes. DHMO contamination is a real, global issue, with DHMO being detected in lakes, streams and reservoirs across the globe. DHMO has caused trillions of dollars of property damage in almost every country, especially in developing nations.

Despite the danger, DHMO is commonly found in the household, in the form of additives in food and drinks, cleaning products and even styrofoam. There are no regulation laws for DHMO and multi-national companies continue to dump waste DHMO into rivers and the ocean. It is astounding to see such a deadly chemical go unregulated.

If you have not caught on by now, dihydrogen monoxide’s chemical formula is H2O – also known as water. Technically speaking, there are no false statements in the above description. But even children know that water is not only (relatively) safe, but necessary for life. The report on “dihydrogen monoxide” originates from a 1997 science fair project by Nathan Zohner, who was 14 years old at the time. His project was titled “How Gullible Are We?” and involved presenting his report about “the dangers of DHMO” to fifty school students to see what their reaction would be. 43 students favoured banning it, 6 were undecided and only one recognised that DHMO was actually water. Even more surprising is that there are cases (such as in California in 2004), where city officials came close to banning the substance, falling for the hoax. This goes to show how gullible people can be in the face of what they do not know.

Posted in Psychology & Medicine

Stendhal Syndrome

Posted on by Jinavie

There have been recorded cases of people gazing upon a beautiful panorama of Florence or an exquisite painting and suddenly collapsing. The condition is known as Stendhal syndrome, alternatively called Florence syndrome or hyperkulturaemia (excess culture in blood). It has been described as causing tachycardia (rapid heartbeat), dizziness, confusion and fainting after being exposed to a particularly beautiful piece of art or scenery. It is named after French author Stendhal (penname of Henri-Marie Beyle), who upon visiting Florence in 1817 experienced the very condition.

Stendhal syndrome is most likely related to a very common phenomenon known as vasovagal syncope, where extreme emotions overwhelm the brain, induce a massive parasympathetic nervous response, causing the person to faint. There are two major nervous systems: the sympathetic and parasympathetic. The sympathetic nervous system is responsible for the fight-or-flight response and essentially prepares the body for physical activity. The parasympathetic nervous system does the complete opposite and is activated when you are resting or digesting food. Thus, a burst of parasympathetic nervous activity causes a sudden fall in heart rate and blood pressure, causing the brain to lose the oxygen supply needed to maintain consciousness. When the person faints, they collapse and blood flow is restored to the brain. Vasovagal syncope can be caused by anything from standing up very quickly, extreme emotions (e.g. stress, seeing blood or needles) and fatigue. It is the most common cause of collapse and is (usually) completely harmless.

When a person looks at a breathtaking view or a stunning work of art, their brain is overwhelmed by intense emotions of excitement and joy. In the case of Stendhal syndrome, this effect is so great the person is literally blown away by the sight.

The people of Florence have noted that this phenomenon is rather common in tourists visiting the beautiful city.

Posted in Psychology & Medicine

The Three Christs Of Ypsilanti

Posted on by Jinavie

On July 1, 1959, a social psychologist named Milton Rokeach began an experiment in Ypsilanti State Hospital in Michigan to explore the nature of delusions. He gathered three paranoid schizophrenics who each believed they were Jesus Christ and put them in one room. Technically, there can only be one Jesus Christ. So how did the three schizophrenics respond to each other’s claims that they were Jesus?

The experiment ran for two years, with the three patients meeting regularly with Rokeach (under the guise that it was a support group). The initial meetings were far from peaceful. One “Christ” would yell out that the other two were fakes, while another would decry that he would not worship the other Christ as he was the real Jesus. The third reasoned that there cannot be more than one Jesus, and that he was the Good Lord. The arguments escalated to the point of physical violence in many cases. No one would budge and accept that the other person could be Jesus, as they themselves were Jesus. It was the ultimate paradox and cognitive dissonance, as there can be only one Jesus.

Rokeach hoped that the patients would soon see the error of their delusions. He even went as far as sending each of them fake letters from the patient’s “wife” and “the hospital boss” to see if they would alter their routine as the letter advised. But instead of breaking down and accepting that they were deluded, the three patients each found an explanation to resolve the cognitive dissonance.

One patient declared that his fellow patients were actually dead but being controlled by “machines”, thus their arguments were not credible. The other two explained that the other patients were “crazy” people with mental health issues, thus they should not be believed.

This is not a surprising ending to the story, as the definition of a delusion is that it is a “fixed, false belief not amenable to reason”. By definition, a delusion cannot be “reasoned” or broken with logic. Even if you blatantly show the patient proof that their delusion is not real, the patient will not yield. Instead, they will find creative ways to work around the inconvenient truth. Ergo, no matter what evidence you put forward, those three patients would always, in their mind, be the one and only Jesus Christ.

Now let us assume that you met a doppelgänger who states that they are the real “you”, challenging your identity. How would you respond? Challenging one’s identity is the most vicious attack possible, as no person is secure enough with their own identity to be unaffected by the attack. Because people define themselves with a set identity, changing even a small portion of their identity causes extreme confusion and panic. To avoid such emotional turmoil, the brain does everything in its power to protect the identity it believes in. This is why people will respond with fury and anger when their identity is challenged.

People say that “I know myself the best”. But if we construct our identities around flimsy, false foundations, we would still cling to the idea that that is our true identity. If people were to suggest that we are not who we think we are, our brain would defend its identity at all costs. In that case, are our identities delusional? How do we know whether our identity is the real us, or a delusion our brain is clinging to?

Better yet, imagine that everyone around you claimed that you are a duck. Even though you know for sure that you are not a duck, everyone else sees you as a duck and defines you as a duck. An interesting thing about delusions is that the definition includes the phrase: “…and not in keeping with that person’s subculture”. This means that if everyone in your subculture were to say that your belief and your identity were wrong, you could be labelled “delusional”. In that case, are you crazy or is everyone else crazy?

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Posted in Life & Happiness

Delicacy

Posted on by Jinavie

A delicacy is a food considered highly desirable due to its unique taste and rarity. Every culture has a different delicacy, ranging from commonly found but peculiar foods such as raw oysters, to very rare foods such as flamingo tongue (a highly prized dish in ancient Rome). Some examples of culture-specific delicacies include: beondaegi in Korea (steamed silkworm pupae), fugu in Japan (blowfish, very poisonous if not prepared correctly), bird’s nest soup in China (made out of swiftlet nests which are made of various fish) and escamoles in Mexico (ant larvae). In the Western hemisphere, three foods have classically been called the “three great delicacies”. These are: foie gras, truffle and caviar.

Foie gras is French for “fatty liver” and it is the liver of a goose that has been fattened up. Because of the rich fat content, foie gras is extremely smooth, buttery and delicate and is highly sought after in gourmet cooking. However, there is much controversy around the preparation of the dish. To fatten the liver, geese are tied up and force-fed large amounts of feed via a funnel and tube. This method is known as “gavage”. Because the geese are held still and force-fed so much food, there is a risk of the oesophagus rupturing and killing the geese. But this death could almost be considered merciful given the horrendous gavage process that can only be considered as torturous.

Truffle is a type of mushroom that lives underground. It is difficult to find and cultivate, making it a rare and valuable ingredient. In fact, it is considered “diamond of the earth” because of that reason. Truffles come in black truffles and white truffles. Black truffles are more commonly used in French dishes, along with simple-tasting foods such as soup and veal. It is also eaten alongside foie gras sometimes. The white version is more common in Italian foods. It is eaten raw and grated over a dish or salad.

Caviar is a Russian delicacy consisting of salted sturgeon roe (fish egg). It is considered one of the most luxurious foods on the planet, with some connoisseurs describing it as the culinary equivalent of an orgasm. Because the roe is not cooked, it retains its unique fishy taste which might make it unpalatable at first. But then people become hooked on the unique, addictive taste that cannot be copied. The price of $8000~16000 per kilogram shows just how much people are willing to pay for the ultimate taste.

Posted in Science & Nature

Vision

Posted on by Jinavie

Consider this: if you see something that is not there, or not see something correctly, is that due to a problem in your eyes or your brain? An interesting anatomical fact is that the eyes are part of the brain. They originally evolved from the brain and drifted further and further forwards, connected to the brain by the optic nerves. If you lift a brain out from the skull, the eyes would be pulled backwards too. But technically speaking, eyes are distinct organs by themselves that have merely originated from a portion of the brain. It does not think or make decisions by itself. Just like a camera, an eye records things as it sees it and transmits it to the brain via the optic nerve via electrical signals. The brain then processes the signals in the occipital lobe, located at the back of the head (this is why you “see stars” when you bang the back of your head).

This means that vision can be altered anywhere along the pathway. If you have cataracts, where the lens of the eye becomes clouded, you lose portions of your visual field. If you have a large pituitary gland tumour, it presses on the optic nerve and causes double vision (diplopia) or vision loss. If you have a stroke in the occipital lobe, you can lose your vision. The brain’s role in producing vision can easily be demonstrated in the form of optical illusions. The eye merely records and transmits what it sees, but the brain becomes confused by what information it receives and tries to make sense of it. In the process, we experience bizarre illusions such as static images moving by themselves.

Because of this intricate pathway, some pathologies present with fascinating symptoms. A condition called Anton’s blindness (or Anton-Babinski syndrome) causes a patient to “see” despite being blind. Patients with Anton’s blindness are adamant that they can see perfectly clearly, and will even describe what they are seeing. However, what they “see” is completely different to what the object actually looks like. For example, if the patient looked at a blonde woman wearing a yellow blouse and a red skirt, they may describe her as a brunette woman wearing a blue shirt and black jeans.

The reason for their blindness is that their occipital lobe was damaged (usually by a stroke), leading to an inability to process the information from the eyes. Although the eyes are pristine and record what they see in perfect detail, the brain is incapable of interpreting the signals. The brain then goes on to confabulate, where the brain fills the gap by conjuring up false information. This makes Anton’s blindness quite hard to pick up on as the patient will not complain of it. It is only found when someone pays close attention to the patient and notices subtle cues like the patient bumping into furniture or talking in the direction where they think a person is at (even after they move). Ergo, the patient adamantly believes that they can see as their brain thinks it is seeing things (even though it is not receiving the information from the eyes properly).

Seeing is not believing. You see what you believe.