Tag: senses

Posted in Life & Happiness

Recipe For Happiness: Mindfulness

Posted on by Jinavie

(This is a three part mini-series on happiness. See the full series here: https://jineralknowledge.com/tag/arkhappyrecipe/?order=asc)

Mindfulness is the state of mind where you are aware of and attentive to the present, accepting it while not being judgemental. Simply put, it is “living in the moment”. It may sound easy, but in reality, we are not very skilled at sustaining attention to the present. We are easily distracted by regrets of the past or fears for the future. Even when we are aware of the present, we judge constantly. Thoughts such as “I can’t believe I said that, it’s so stupid” or “This person is annoying me so much, I hate it” are some examples.

When we are mindful, we can look into our brains and isolate what is really bothering us. Instead of being trapped within a maze of neurosis, you can look at your emotional response rationally. This allows you to try figuring out what is causing it and how you might fix it.

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For example, you might feel angry when your friend does not reply to your messages. Our default state is to feel angry and lash out at our friend. But from a mindful state, you might see that your anger stems from your belief that your friend does not care about you. Then, you might remember that your friend is very busy studying for an exam and realise that there was a fair reason for them not replying. By being mindful, you self-aborted the vicious cycle of negative emotions and prevented the unhappiness it could cause.

There have been numerous studies that have shown the benefits of mindfulness. Not only does it reduce stress and increase happiness, but it also improves your physical health. But unfortunately, mindfulness takes practice to develop.

Mindfulness is trained through meditation. During meditation, you enter a relaxed state where you can focus on your “mind’s eye” rather than worldly distractions. There are numerous types of exercises that are available, such as breathing exercises and guided meditation.

A mindfulness exercise you can try right now is the Five Senses Meditation.
First, focus on what you are seeing right now. Describe everything in detail: the pigeon flying away, the red-headed girl handing out pamphlets, the blue sky. Ignore your emotional response to what you see and focus only on what you actually see. Now, close your eyes and focus only on your hearing. Do you hear the twittering of birds, the chatter amongst people, the leaves rustling in the wind? Keep doing this one-by-one with your other senses: touch, smell and taste. With each sense, focus only on what you “see” through that sense, blocking out everything else. Focus on the feeling of your clothes on your body, the scent of the person sitting next to you, the aftertaste of the breakfast you just ate. Lastly, open your eyes.

You will now be able to see the little details of the moment you’re in, through heightened senses. Then you will realise that you exist in this moment. Not in the past or the future, but in the present that your senses are excitedly telling you about.
The key to happiness is not an epic quest to find the Holy Grail. All you need to do is pay attention and look around you.

Happiness is now.

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Posted in Psychology & Medicine

Synaesthesia

Posted on by Jinavie

What colour do you associate with the letter “E”? What sound do you hear when you feel the fluffiness of cotton? These sound strange to most people as we experience the senses in distinct ways. However, for 4% of the population, this is a completely normal experience.

Synaesthesia (“joined sensation”) is the neurological phenomenon where two or more senses are coupled together. This creates two kinds of synaesthesia: projection, where you physically sense something (such as seeing a purple circle when hearing piano music), and association, where you associate the sense with another sense (“that sounds quite orange”).

The most common form of synaesthesia that is reported is grapheme-colour synaesthesia, where certain people perceive letters and numbers as different colours. However, there are various kinds of synaesthesia, such as chromesthesia, where people associate sounds with colours (previously called “coloured hearing”). In fact, almost every combination of senses have been described, with some individuals experiencing multiple senses at the same time.

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The exact origin and mechanism of synaesthesia are yet to be fully explained. The most likely explanation is that in the brain of synaesthetes, the neural pathways for the various senses cross-over more than they should, causing the simultaneous activation. There are already some cross-overs between these pathways, as evidenced by various sensory illusions that the average person can enjoy. For example, a ventriloquist can fool the audience into thinking the puppet is talking as we hear speech and see the puppet’s mouth moving.

An alternative explanation is that there may be an element of ideasthesia – where concepts are paired with sensory experience. This would mean that synaesthetes are experiencing sensations due to the idea something represents, not because of the original sensory stimulus.

For example, when a synaesthete describes that the word “tree” tastes like brie cheese, it might not be the sound of the word, but rather the concept of a tree that triggers the sensation. We actually see examples of this in day to day life in the form of metaphors. We describe a wine having a round taste or a person being sweet.

There is much to learn about the phenomenon, but synaesthesia has already deepened our understanding of how we perceive the world, process it and commit it to memory through the use of associations and mnemonics.

Posted in Psychology & Medicine

A Sensational Experience

Posted on by Jinavie

We use our senses to interpret the world around us. Thanks to photography, video and sound recording, we are able to preserve what we see and hear in our lives. If you have the good fortune of seeing an incredible view such as a beautiful sunset, you can take a photo, look at it ten years later and remember what it was like watching it with your own eyes. If you miss the sound of your loved one’s voice, you can record the sound and play it again.

However, we are still unable to record senses such as taste, smell and touch. No matter how hard you try, you can never perfectly describe the taste of your mother’s cooking, the soft touch that you felt during your first kiss, or the scent of the person you love to another person using just words. This means that these sensations are only in your memories – and yours alone.

It is a shame that you cannot recall these experiences perfectly, as some of our best memories are associated with them. But perhaps you could think of it from a romantic point of view. You can share a photo or a sound clip with others to share your experience – even make it public so that everyone can know of it. However, with things like taste and smell, only you will know and remember that specific sensation. It is a truly unique experience that belongs only to you (and the few others who were lucky to have tasted your mother’s cooking).

Furthermore, as it is only in your memories, the moment you forget about it, the experience will disappear forever. Maybe that is why people cling to nostalgia of these senses – because it is a fragile yet precious thing that is worth treasuring and holding on to.

Posted in Simple Pleasures of Life

Simple Pleasures of Life #29

Posted on by Jinavie

Doing absolutely nothing.

I kinda mentioned this in a previous post, but that was more in the context of taking a break. Don’t get me wrong, I LOVE doing stuff. Especially right now where all I can think of is all the stuff I’m waiting to do as soon as exams are over. But there’s a real simple joy in doing absolutely nothing. Just…sitting there, you know?

Of course I don’t mean literally nothing where you switch off your brain. That’s what you do when you watch TV (which I heartily endorse). But I mean putting down the book you’re reading or pausing that video, sitting back and getting lost in your thoughts. Maybe you’ll ponder the deep philosophies of what it means to be alive, or create an imaginary world you can adventure in.

If you don’t feel like exploring the inner workings of your mind, then get lost in your surroundings. Have you ever really taken into account what you see, hear, smell, taste and touch? Bernard Werber talked about a relaxation technique called “Opening your senses” in his books, which involves you systematically saying out loud everything you experience in the moment with each sense. For example, close your eyes and say everything you hear, to the smallest detail. Then do the same with all your other senses, you’ll notice that you’ve been missing out a lot of things in this world.

Sherlock Holmes stated that there is a great difference between seeing and observing. Try this out sometime. Have a cup of coffee at a cafe by yourself and look around you. You might see a boy and a girl making idle chit chat, but you might observe the two showing various subtle body language signs of mutual attraction. See if you can figure out a person’s job or personality or health condition just from observation. People-watching can be very fun, as long as you’re not being…you know, creepy.

So go on, drop what you’re doing, go lie in a patch of grass or sit at a cafe or wherever and just do nothing.

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Posted in Psychology & Medicine

Viscera: Brain

Posted on by Jinavie

(Learn more about the organs of the human bodies in other posts in the Viscera series here: https://jineralknowledge.com/tag/viscera/?order=asc)

(NB: I have written MANY ARK posts about the brain and all the delightful ways it screws up. Some of them are probably the most interesting posts on my blog. Please click the hyperlinks to check out the various related articles! 😀 Alternatively, here’s a convenient list: https://jineralknowledge.com/tag/brain/?order=asc)

Among the many organs of the human body, no organ comes close to the magnificent complexity that is the brain. The brain acts as the command centre of the body. It receives massive amounts of information through the various senses, processes it and sends out electrical signals to control how the body operates. Not only does it control “basic” functions such as movement of muscles, controlling organ functions and regulating homeostasis, it is also responsible for the so-called “higher functions” such as consciousness, emotions and cognition. It is the true seat of the mind and soul.

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The brain is the only major visceral organ not located in the trunk (body). It is enclosed in the cranium of the skull, which acts as a protective casing. Because it is a closed box, even a small increase in volume (such as due to a bleed or a tumour) can cause extreme pressures to build, causing severe problems. The entire brain and spinal cord are bathed in a fluid called cerebrospinal fluid (CSF), all enclosed by a sheath made of three layers (dura, arachnoid and pia maters). The brain sends out nerves to the rest of the body, which act as electrical wiring transmitting signals. These include the cranial nerves and the spinal cord, which leaves the bottom of the skull down the spine. The spinal cord branches off into many nerves that supply every nook and cranny of the body. The brain itself is made up of two large hemispheres, which are connected by a bridge called the corpus callosum. Despite popular belief, the actions of the two hemispheres are much more complicated than “analytical vs. creative”. The brain also encompasses the cerebellum (the small stripey structure at the back), which controls coordination and speech articulation, and the brainstem, which is involved in autonomic control of life-sustaining functions such as breathing, and also the source of the cranial nerves.

In the last century, scientists have learned that specific parts of the brain play a specific role. This thought started with the field of phrenology, where small areas of the brain were mapped to a certain mental faculty, such as love, wit or destructiveness. Although this turned out to be complete hokum, the idea stayed and we now know the actual functions of each part of the brain. The brain is broadly divided into four lobes: frontal, parietal, temporal and occipital. The frontal lobe is the domain of thought, personality, motor function and other higher functions. The parietal lobe is related to spatial awareness and sensory functions (such as touch). The temporal lobe is linked to hearing, comprehension of language and storing new memories. The occipital lobe is primarily associated with vision. The brain can then be subdivided into more focussed areas, such as Broca’s area that governs speech and Wernicke’s area that governs listening. It should be noted that the four lobes only describe areas on the surface of the brain (cerebral cortex) where the higher functions belong. The inside of the brain is just as complicated and has many different parts, such as the hypothalamus that is involved in homeostasis, and the hippocampus that converts short-term memories into long-term memories.

How does a lump of cells weighing around 1.5kg produce such wondrous abilities such as philosophical thought, deduction, emotions and calculation? The truth is that we still do not know how the brain functions exactly. However, we know that the brain is composed of a large number of neurons (nerve cells) – about 100 billion of them. These neurons connect to one another via a synapse, which is a gap between two nerve cells where neurotransmitters travel to and fro (allowing electrical impulses to jump from one neuron to another). Using these connections, neurons form an unbelievably intricate and complex network of electrical activity. Because one neuron can connect to many more others, the number of synapses is estimated to be around 100~1000 trillion – significantly more powerful compared to any computer in the world. The number of synapses directly correlates to intelligence and it seems intellectual activities such as reading a book increases the number of synapses in the brain. We have yet to understand exactly how the brain uses this incredible computational power to produce cognition and self-awareness.

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(Video of neuronal activities in a zebrafish brain)

Because the brain uses electrical impulses for most of its functions, a common abnormality that is seen with the brain is when the electrical activity becomes disorganised and out of control – a seizure. This abnormal electrical activity may be due to a focal problem such as a tumour, or a generalised misfiring of neurons or altered regulation of electrical activity. When a seizure happens, the disorganised activity results in the brain not being able to function normally. For example, the most common consequence is a fit (tonic-clonic seizure) where every muscle spasms out of control, because the muscles are overloaded with chaotic signals. Focal seizures can cause fascinating symptoms depending on the location, such as temporal lobe seizures causing religious visions (hallucination). This also disrupts consciousness, which is why most epilepsy patients do not remember the event.

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Posted in Psychology & Medicine

Cranial Nerves

Posted on by Jinavie

Nerves can be divided broadly as spinal nerves and cranial nerves: the latter which is directly from the brain. There are 12 pairs of cranial nerves:

  1. CN I – Olfactory nerve (smell)
  2. CN II – Optic nerve (sight)
  3. CN III – Oculomotor nerve (eye movements, control of pupil and lens)
  4. CN IV – Trochlear nerve (eye movements)
  5. CN V – Trigeminal nerve (sensory information from face and mouth, chewing)
  6. CN VI – Abducens nerve (eye movements)
  7. CN VII – Facial nerve (taste, tear and salivary glands secretion, facial expressions)
  8. CN VIII – Vestibulocochlear nerve (hearing and sense of balance)
  9. CN IX – Glossopharyngeal nerve (taste, swallowing, parotid gland secretion, sensory information from oral cavity, information about blood)
  10. CN X – Vagus nerve (sensory and motor signals to and from many internal organs, glands and muscles)
  11. CN XI – Accessory nerve (movement of SCM and trapezius, which are neck/shoulder muscles)
  12. CN XII – Hypoglossal nerve (tongue movements)

As there are so many nerves and the names are all varied, there is a simple (yet very obscene) mnemonic to help medical students remember the names and order of nerves:

Oh, Oh, Oh, To Touch And Feel Virgin Girls’ Vaginas And Hymens
or
Oh, Oh, Oh, To Touch And Feel A Girl’s Very Soft Hands
(where vestibulocochlear -> auditory)

It is also worth noting the mnemonic for the types of nerves is:

Some Say Marry Money, But My Brother Says Big Boobs Matter More

Perhaps the only way to survive medical school is through humour.