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How the Brain Perceives Colors?

Color vision is the ability to distinguish different wavelengths of electromagnetic radiation. Color vision relies on a brain perception mechanism that treats light with different wavelengths as different visual stimuli (e.g., colors). Usual color insensitive photoreceptors (the rods in human eyes) only react to the presence or absence of light and do not distinguish between specific wavelengths.

We can argue that colors are not real—they are “synthesized” by our brain to distinguish light with different wavelengths. While rods give us the ability to detect the presence and intensity of light (and thus allow our brain to construct the picture of the world around us), specific detection of different wavelengths through independent channels gives our view of the world additional high resolution. For instance, red and green colors look like near identical shades of grey in black and white photos.

An animal with black and white vision alone won’t be able to make a distinction between, let’s say, a green and red apple, and won’t know which one tastes better before trying them both based on color. Evolutionary biologists believe that human ancestors developed color vision to facilitate the identification of ripe fruits, which would obviously provide an advantage in the competitive natural world.

Why certain wavelengths are paired with certain colors remains a mystery. Technically, color is an illusion created by our brain. Therefore, it is not clear if other animals see colors the same way we see them. It is likely that, due to shared evolutionary history, other vertebrates see the world colored similarly to how we see it. But color vision is quite common across the vast animal kingdom: insects, arachnids, and cephalopods are able to distinguish colors.

What kind of colors do these animals see?

Human color vision relies on three photoreceptors that detect primary colors—red, green, and blue. However, some people lack red photoreceptors (they are “bichromates”) or have an additional photoreceptor that detects somewhere between red and green colors (“tetrachromates”). Obviously, having only 3 photoreceptors doesn’t limit our ability to distinguish other colors.

Each photoreceptor can absorb a rather broad range of wavelengths of light. To distinguish a specific color, the brain compares and quantitatively analyses the data from all three photoreceptors. And our brain does this remarkably successfully—some research indicates that we can distinguish colors that correspond to wavelength differences of just 1 nanometer.

This scheme works in largely the same way in most higher vertebrate animals that have color vision. Although the ability to distinguish between specific shades varies significantly between the species, with humans having one of the best color distinguishing abilities.

However, invertebrates that have developed color vision (and vision in general) completely independently from us demonstrate remarkably different approaches to color detection and processing. These animals can have a exceptionally large number of color receptors. The mantis shrimp, for instance, has 12 different types of photoreceptors. The common bluebottle butterfly has even more—15 receptors.

Does it mean that these animals can see additional colors unimaginable to us? Perhaps yes. Some of their photoreceptors operate in a rather narrow region of light spectrum. For instance, they can have 4-5 photoreceptors sensitive in the green region of the visual spectrum. This means that for these animals the different shades of green may appear as different as blue and red colors appear to our eyes! Again, the evolutionary advantages of such adaptations are obvious for an animal living among the trees and grasses where most objects, as we see them, are colored in various shades of green.

Researchers tried to test if a more complicated set of visual receptors provide any advantages for animals when it comes to the distinguishing between main colors. The findings show that this is not necessarily the case, at least not for the mantis shrimp. Despite the impressive array of receptors detecting light in a much broader part of the electromagnetic spectrum compared to humans, the shrimp’s ability to distinguish between colors that great in comparison to us. However, they determine the colors fast. This is probably more important for practical purposes, as mantis shrimps are predators. A large number of photoreceptors allows for their quick activation at specific wavelengths of light and thus communicate directly to the brain what specific wavelength was detected. In comparison, humans have to assess and quantify the signals from all three photoreceptors to decide on a specific color. This requires more time and energy.

Apart from employing a different number of photoreceptors to sense light of specific wavelengths, some animals can detect light that we humans are completely unable to see. For example, many birds and insects can see in the UV part of the spectrum. Bumblebees, for instance, have three photoreceptors absorbing in the UV, blue, and green regions of the spectrum. This makes them trichromates, like humans, but with the spectral sensitivity shifted to the blue end of the spectrum. The ability to detect UV light explains why some flowers have patterns visible only in this part of the spectrum. These patterns attract pollinating insects, which have an ability to see in this spectral region.

A number of animals can detect infrared light (the long wavelength radiation) emitted by heated objects and bodies. This ability significantly facilitates hunting for snakes that are usually looking for small warm-blooded prey. Seeing them through IR detecting receptors is, thus, a great tool for slow-moving reptiles. The photoreceptors sensitive to IR radiation in snakes are located not in their eye but in “pit organs” located between the eyes and nostrils. The result is still the same: snakes can color objects according to their surface temperature.

As this brief article shows, we humans can see and analyze only a small portion of the visual information available to other creatures. Next time you see a humble fly, think about how different it perceives the same things you are both looking at!

References:

Skorupski P, Chittka L (2010) Photoreceptor Spectral Sensitivity in the Bumblebee, Bombus impatiens (Hymenoptera: Apidae). PLoS ONE 5(8): e12049. doi: 10.1371/journal.pone.0012049

Thoen HH, How MJ, Chiou TH, Marshall J. (2014) A different form of color vision in mantis shrimp. Science 343(6169):411-3. doi: 10.1126/science.1245824

Chen P-J, Awata H, Matsushita A, Yang E-C and Arikawa K (2016) Extreme Spectral Richness in the Eye of the Common Bluebottle Butterfly, Graphium sarpedon. Front. Ecol. Evol. 4:18. doi: 10.3389/fevo.2016.00018

Arikawa, K., Iwanaga, T., Wakakuwa, M., & Kinoshita, M. (2017) Unique Temporal Expression of Triplicated Long-Wavelength Opsins in Developing Butterfly Eyes. Frontiers in Neural Circuits, 11, 96. doi: 10.3389/fncir.2017.00096

Image: https://pixabay.com/en/butterfly-3d-blue-mushroom-forest-2049567/

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Chinese Premier Li Keqiang calls for crackdown on vaccine industry

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First malaria drug in 60 years given approval

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Richard Bacon: 'The most shocking moment of my life'

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Opioids: Why 'dangerous' drugs are still being used to treat pain

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Japan heatwave: Warnings issued amid scorching temperatures

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Blind dog gave autistic woman 'hope in life'

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Is Social Media the Bad Guy? Redefining Beauty in a Digital World

We’re living in an age of hyper-connectivity where social media is being widely used by almost every age group in the world. It’s connected people from all corners of the planet and given us the opportunity to have global conversations about practically any subject, event, or news piece.

However, many mental health and behavioral experts believe that social media has had a negative impact on the psychological well-being of those who use it because it gives people the illusion of being popular based solely on how many “likes” and “friends” they have on their profiles.

Psychologists have also observed that social media exacerbates the tendency for frequent users to develop a skewed impression of the world which is seldom accurate or healthy. Young girls and women, for example, may develop unrealistic standards when it comes to their looks and bodies based on what they see on social media.

But instead of labeling social media as the bad guy, I see it as a double-edged sword. The eventual effect that it has on your life really comes down to how you use it and for what purpose. The Internet is a neutral and open platform that levels the playing field when it comes to having access to knowledge that could help us live healthier, productive, and more fulfilling lives.

If anyone wants to avoid the negative impact that social media could have on her self-image, they need to become more conscious of their media diet. If they follow social media accounts and blogs run by people and institutions that are shallow and appearance-focused, such as Instagram models and celebrity fashion and gossip related profiles, it can hurt them if they aren’t mindful of its probable impact on them, especially on a subconscious level.

The negative impact of social media can be avoided if people are guided towards adopting a more empowering and all-encompassing standard of beauty which includes all aspects of being—intellect, aspirations, passions, talents and her morals.

In this way, they will be naturally drawn towards developing an identity that isn’t solely based on outward appearances but on character—this, in turn, will influence the use of social media for noble purposes that will expand the mind and provide a platform to express creative potential and to make a difference. In other words, we need to take an inside-out approach when it comes to combating the potentially harmful effects of social media, or any other forms of media.

Image via pixel2013/Pixabay.

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VIDEO: How Facebook Preys on Our Mental Health

In an ironic turn, the recent controversy surrounding Facebook and Cambridge Analytica eclipsed another controversy brewing months before. As 2017 came to close, the million-dollar question surrounding the company was, Does Facebook make us depressed?

Back in December, even Facebook itself posted an article on its official blog, titled, Hard Questions: Is Spending Time on Social Media Bad For Us? The post cites a number of studies that prove spending time on Facebook can threaten well-being.

One study from the University of San Diego and Yale found that people who clicked on four times as many links or liked twice as many posts as the average person reported decreased mental health in a survey. A broader study found that increases in “likes clicked,” “links clicked,” or “status updates” was associated with decreases in mental health.

But though these studies might prove that Facebook brings us down, they don’t ask the important question of how Facebook brings us down. For a more thorough dive into what truly addict us to the site, ultimately leaving us feeling unsatisfied, check out this video, which explains the subject in depth:

The video presents arguments from two former employees, Sean Parker and Chamath Palihapitiya, who claim that Facebook was designed to prey on its users’ neurochemical reward systems. Dopamine, the chemical released in the brain during certain activities, such as exercising, finishing tasks at work, and finding food, has also been found to surge during social interactions. The brain desires cooperation and connection, so it sends reward signals in the form of dopamine when this cooperation or connection occurs. It could be something as simple as carrying a couch up a flight of stairs with a friend, or as profound as telling your partner you love her.

Because the brain cannot distinguish between, an interaction in real life and one on Facebook in terms of dopamine release, these rewards systems are integral to Facebook’s interface. Even the little red notification, or the ping sound we’ve all become accustomed to, produce a similar dopamine release.

The key insight in the video is that Facebook knows these dopamine hits are essential to their business model, the main driving force bringing people back to the site over and over and over again. Knowing this, they’ve ramped up notifications over the years, spiking our dopamine levels for something as mundane and uninteresting as someone having gone “live” a few hours ago, or a belated birthday, or even just to tell you that you haven’t posted in a while.

What happens, then, is a uniquely modern phenomenon. Your brain is rewarding you with dopamine for a successful social interaction, but in reality, no genuine connection has occurred, creating a disconnect between the chemical reward system in your brain and your actual lived experience.

Obviously, Facebook can depress its users in a number of ways. People often assume others’ lives are happier than theirs because of how their friends present themselves online. Teen brains are now trained to be distracted based on the interface alone. But this feeling, the dopamine hit followed by immediate disappointment with the reality of a meaningless notification, seems central to the deflating feeling Facebook can produce.

References

Shakya, H., & Christakis, N. (2017). Association of Facebook Use With Compromised Well-Being: A Longitudinal Study. American Journal Of Epidemiology. doi: 10.1093/aje/kww189

Verduyn, P., Lee, D., Park, J., Shablack, H., Orvell, A., & Bayer, J. et al. (2015). Passive Facebook usage undermines affective well-being: Experimental and longitudinal evidence. Journal Of Experimental Psychology: General, 144(2), 480-488. doi: 10.1037/xge0000057

Image via geralt/Pixabay.

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Mental Health is Not Just the Absence of Mental Illness

In an increasingly globalized and mediatized world, in which mental illness is one of society’s most discussed cultural artifacts, Colleen Patrick Goudreau’s words ring out: “If we don’t have time to be sick, then we have to make time to be healthy”.

With the prevalence of mental health problems, it is clear why. Mental health issues are one of the leading causes of the overall disease burden globally, according to the World Health Organisation. One study reported that mental health is the primary source of disability worldwide, causing over 40 million years of disability in 20 to 29-year-olds.

Compared to previous generations, mental illness is now said to surpass the effects of the Black Death. The root causes of the unprecedented rise in people directly affected by mental illness, and the cost of this, can be considered across at least three levels of analysis.

If we don’t have time to be sick, then we have to make time to be healthy.

Colleen Patrick Goudreau

At the first level of analysis, the root cause of mental illness is an amalgamation of heredity, biology, environmental stressors, and psychological trauma.

Notions of specific genes being responsible for illness have been supplanted by those of genetic complexity, where various genes operate in concert with non-genetic factors to affect mental illness. That is, health-relevant biology and mental health impact each other in a complex interplay, which is inherently social.

Despite the importance of understanding the social underpinnings of biological risk factors for mental illness, there is a relative paucity of research investigating this topic. Research that does exist, is nevertheless engrossing. For example, one study, of many, found that social isolation leads to increased risk of coronary heart disease. Since low levels of social integration are related to higher levels of C-reactive protein, a marker of inflammation related to coronary heart disease, social integration is posited to be a biological link between social isolation and coronary heart disease.

Moreover, social support affects physical perception. In a landmark study, researchers demonstrated that people accompanied by a supportive friend or those who imagined a supportive friend, estimated a hill to be less steep when compared to people who were alone.

Mental health, like physical health, is more than the sum of functioning or malfunctioning parts.

At the second level of analysis, the complex bio-social interplay scaffolding mental illness points to the fundamentally chemical underpinnings of human thinking and emotion.

With recent advances in neuroscience like Clarity, we are now able to make the brain optically transparent, without having to section or reconstruct it, in order to examine the neuronal networks, subcellular structures, and more. In short, we can examine mental illness from a biological perspective.

The depth and complexity of the bio-social root of mental illness, however, paints a more nuanced picture than discussed thus far. With such pioneering work, there is an increasingly popular assumption that the brain is the most important level at which to analyze human behavior.

In this vein, mental illness perpetuates itself by virtue of the fact that people often consider it to be biologically determined. In turn, a ‘trait-like’ view of mental illness establishes a status quo of mental health stigma by reducing empathy. Such explanations overemphasize constant factors such as biology and underemphasize modulating factors such as the environment.

At the third level of analysis, the obsession with seeing mental health in terms of mental illness reveals the fallible assumption that mental health is simply the absence of mental disorder. However, the problematic landscape of mental health draws on a far wider set of working assumptions. That is, mental health, like physical health, is more than the sum of the functioning or malfunctioning parts. It is an overall well-being that must be considered in light of unique differences between physical health, cognition, and emotions, which can be lost in a solely global evaluation.

So, why do we as a society ponder solving mental illness, which should have been targeted long ago, far more than we consider improving mental health? In part, because when we think of mental health, we think of raising the mean positive mental health of a population, more than closing the implementation gap between prevention, promotion, and treatment.

Cumulatively, social environments are the lubricating oil to biological predispositions, which influence mental health, such that mental health and physical health should be considered holistically. In this vein, national mental health policies should not be solely concerned with mental disorders, to the detriment of mental health promotion.

It is worth considering how mental health issues can be targeted using proactive behavioral programs. To achieve this, it is pivotal to involve all relevant government sectors such as education, labor, justice, and welfare sectors.

In a diverse range of existing players, many nonprofits’, educational institutions’, and research groups’ efforts contribute to the solution landscape of mental health promotion. In Ireland, for example, schools have mental health promotional activities such as breathing exercises and anger management programs. Nonprofits around the world are increasingly seeing the value of community development programmes and capacity building (strengthening the skills of communities in so they can overcome the causes of their isolation). In addition, businesses are incorporating stress management into their office culture.

We think of raising the mean positive mental health of a population, more than closing the implementation gap between prevention, promotion and treatment.

The pursuit to empower people to help themselves joins up these social ventures to teach us that promoting mental health is optimized when it is preventative, occurring before mental illness emerges, and when it is linked to practical skills within a community. Furthermore, these social ventures exemplify how different types of efforts (government, nonprofit, business etc.) cater to different populations, from children to corporates.

While these social ventures bring hope to the future and underscore the importance of sustainable change, there are still too few programs effectively targeting people, who want to maximize already existent positive mental health not just to resolve or cope with mental health issues. If we continue to take such pride in our successful problem finding and solving of mental illness that we ignore mental illness prevention and mental health promotion, we are at risk of increasing the problem we are trying to solve.

References

Heffner, K., Waring, M., Roberts, M., Eaton, C., & Gramling, R. (2011). Social isolation, C-reactive protein, and coronary heart disease mortality among community-dwelling adults. Social Science & Medicine, 72(9), 1482-1488. doi: 10.1016/j.socscimed.2011.03.016

Lozano, R., Naghavi, M., Foreman, K., Lim, S., Shibuya, K., & Aboyans, V. et al. (2012). Global and regional mortality from 235 causes of death for 20 age groups in 1990 and 2010: a systematic analysis for the Global Burden of Disease Study 2010. The Lancet, 380(9859), 2095-2128. doi: 10.1016/s0140-6736(12)61728-0

Schnall, S., Harber, K., Stefanucci, J., & Proffitt, D. (2008). Social support and the perception of geographical slant. Journal Of Experimental Social Psychology, 44(5), 1246-1255. doi: 10.1016/j.jesp.2008.04.011

Image via Wokandapix/Pixabay.

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