Opinion
Immunity Blackout: The Conundrum of ‘Immune Amnesia’ in Humans
Just visualise the scenario where you spend years of your life building up a defence team in your body that remembers every invading enemy it has fought, from chickenpox to the flu, from pneumonia to skin infections and many, many, more. The body then goes on to build up a robust armamentarium to fight them the next time they attempt to cause trouble. This is what usually happens with our natural defence systems of the human body. The memory of the attackers is the thing that leads to war being declared on them subsequently.
Now, imagine a setting where disaster strikes in the form of some intruder who breaks in and erases those memories, leaving your body exposed and unprotected. We now know for sure that this is not a scene from a science fiction movie. It is a real thing that takes place in the human body, called Immune Amnesia; the word amnesia being a glorified term for forgetting something. It is a situation where the body “disremembers” how to fight off diseases it once defeated. This kind of immune memory loss leaves the body wide open to catching infections that one was previously protected against. It is not merely about getting sick again. It is about becoming vulnerable to a whole list of diseases, some of them serious, or even deadly.
The human immune system is like an army that defends the body against harmful invaders like bacteria and viruses. It has two main parts. One is the Innate Immune System, the first line of defence, a quick response team that is inherent in humans, which attacks anything unfamiliar. Humans are born with the capacity to direct this Innate Immune System to respond unreservedly to any harmful agent that invades the body. The second line of resistance of the human defensive army is the Adaptive Immune System, which is the smarter component that specifically remembers past infections and builds explicit and precise weapons to fight them off more efficiently when the perpetrators try to attack the body a second time. These weapons include antibodies and immune memory cells. Thanks to this adaptive immune system, if you had chickenpox as a child, your body remembers how to fight it. That is why one does not usually get it again. The flip side of the coin is that vaccines also work by training this adaptive memory system without one having to go through the actual disease. They are like military drills: safe practice sessions that teach the immune system to recognise and destroy certain pathogens before they get in and cause disease.
Think of your immune system as a vast library filled with records of every infection you have ever encountered. Each record contains information about the specific pathogen and instructions on how to fight it off. When you get a disease or receive a vaccine, new records are added to this library, ensuring that your body is prepared for future encounters.
This phenomenon of Immune Amnesia can occur after certain infections, most famously after contracting the measles virus. In recent years, scientists have come to understand this strange and troubling side effect of an illness that many once believed was simply “a childhood rite of passage.” Measles is not just a fever followed by a rash. It is one of the most contagious diseases known to man, and it can have long-lasting effects on the immune system, even after recovery. Studies in the last decade have shown that measles can erase 20% to 70% of the immune system’s memory. In other words, if you’ve had 100 disease-fighting memory cells, measles might destroy even up to 70 of them. As to how measles does it? Scientists believe that the virus attacks Immune Memory B cells and Memory T cells; these being the two types of specialised immune cells in the body that remember how to fight past infections. Once these cells are damaged or destroyed, your body has to start over from scratch, relearning how to fight infections it already knew how to handle before the “wiping out” of the process.
The really creepy part is that Immune Amnesia does not make you feel sick right away. You may feel perfectly fine after recovering from measles or a similar infection. But your immune system is now more vulnerable. A child who gets measles might recover from the rash and fever. But in the months or years that follow, they could get pneumonia, ear infections, or diarrhoea far more easily than before. These secondary infections can be dangerous, even fatal. In fact, before widespread vaccination, measles did not just kill children through the measles virus itself. Many died from other infections they caught in the months after measles had wiped out their immune memory. That is the reason why countries that introduced the measles vaccine not only saw a drop in measles cases, but also a drop in deaths from other diseases. It turns out that protecting against measles was protecting against a whole range of infections by safeguarding the memory of the immune system.
While measles is the best-known cause of immune amnesia, some scientists are exploring whether other infections might cause similar problems. There’s growing curiosity about whether certain viruses, like the flu viruses or even COVID-19, might temporarily reduce immune memory or even cause immune “confusion”, the latter term referring to a confused immune system attacking normal human tissues or exhibiting less effective responses against disease-causing organisms. While the research is still in early stages, one thing is clear: our immune systems are delicate. Some infections do not just challenge the body, they even rearrange the entire system.
This is where the conversation comes full circle. Vaccination is not just about avoiding a rash or a few days of fever. It is about protecting the long-term memory of your immune system. If you prevent measles through vaccination, you do not just avoid one disease. You also prevent your immune system from being reset and losing its ability to fight off dozens of others. This is why experts emphasise the importance of the measles, mumps, and rubella (MMR) vaccine. Despite its safety and effectiveness, some specific communities and groups of anti-vaxxers have become hesitant or sceptical about vaccines, often due to misinformation and disinformation. But studies have shown that in communities where vaccination rates drop, not only does measles come back, but so do many other infections. It is just like pulling a thread and watching an entire sweater unravel and disintegrate.
Immune amnesia also has consequences for entire populations, not just individuals. When a community is mostly vaccinated, herd immunity kicks in. This means that even people who cannot get vaccinated, like little babies or those with weak immune systems, are protected because the disease has nowhere to spread. But when vaccination rates fall and diseases like measles spread, immune amnesia weakens the immune systems of those who get infected. This creates a ripple effect where many other infections spread more easily, even to people who never had measles. In other words, immune amnesia can help fuel epidemics of other diseases. That is a very heavy price to pay for skipping a simple vaccine.
Immune amnesia is not just a curious biological fact. It is not just another strange scientific fact that might just blow away. It has very serious implications for public health. It could explain why some people get sick more often after recovering from certain infections, and it adds weight to the importance of vaccinations.
The good news is, immune amnesia can be prevented, and the solution is quite a bit straightforward. ONE CLEAR POSITIVE STEP IS TO GET VACCINATED AGAINST DISEASES, PARTICULARLY THOSE THAT ARE KNOWN TO INDUCE IMMUNE AMNESIA. This is particularly important against measles. We need to educate the general public, and this article is a committed attempt to do just that. The society at large should intensely support the public health measures undertaken to facilitate satisfactory vaccination initiatives. If the general public has some concerns regarding vaccines and vaccination, they should promptly ask relevant questions from the proper authorities. It would be most unwise to be guided by portals such as social media.
The World Health Organisation (WHO) recently reported that measles cases in the European region more than doubled from 2023 to 2024, reaching about 127,000, the highest number since 1997. The increase has been linked to a lack of vaccination coverage. It is estimated that half a million children across some parts of the world, which comprises 53 countries in Europe and Central Asia, missed their first dose of the measles vaccine in 2023. Children aged 5 years or younger accounted for about 2 out of 5 cases of the highly transmissible infectious virus.
Immune amnesia is a powerful reminder of how interconnected our health profile really is. One little bug can undo years of carefully crafted immune protection, making the body forget how to fight off old foes. Measles is the best-known example, but scientists are watching for other culprits. The takeaway message is very clear: diseases like measles are not harmless childhood illnesses. They can cause long-term damage, even after the obvious symptoms are gone. Vaccines protect us not just from the disease, but from its deeper and widespread consequences, including Immune Amnesia. So, the next time you think of measles as just a spotty rash, remember that it also can wipe the slate clean, leaving your immune system defenceless and your body at woeful risk.
BY Dr B. J. C. Perera
MBBS(Cey), DCH(Cey), DCH(Eng), MD(Paed), MRCP(UK), FRCP(Edin), FRCP(Lond), FRCPCH(UK), FSLCPaed, FCCP, Hony. FRCPCH(UK), Hony. FCGP(SL)
Specialist Consultant Paediatrician and Honorary Senior Fellow of the Postgraduate Institute of Medicine, University of Colombo, Sri Lanka.
Joint Editor, Sri Lanka Journal of Child HealthSection Editor, Ceylon Medical Journal
Opinion
Buddhist insights into the extended mind thesis – Some observations
It is both an honour and a pleasure to address you on this occasion as we gather to celebrate International Philosophy Day. Established by UNESCO and supported by the United Nations, this day serves as a global reminder that philosophy is not merely an academic discipline confined to universities or scholarly journals. It is, rather, a critical human practice—one that enables societies to reflect upon themselves, to question inherited assumptions, and to navigate periods of intellectual, technological, and moral transformation.
In moments of rapid change, philosophy performs a particularly vital role. It slows us down. It invites us to ask not only how things work, but what they mean, why they matter, and how we ought to live. I therefore wish to begin by expressing my appreciation to UNESCO, the United Nations, and the organisers of this year’s programme for sustaining this tradition and for selecting a theme that invites sustained reflection on mind, consciousness, and human agency.
We inhabit a world increasingly shaped by artificial intelligence, neuroscience, cognitive science, and digital technologies. These developments are not neutral. They reshape how we think, how we communicate, how we remember, and even how we imagine ourselves. As machines simulate cognitive functions once thought uniquely human, we are compelled to ask foundational philosophical questions anew:
What is the mind? Where does thinking occur? Is cognition something enclosed within the brain, or does it arise through our bodily engagement with the world? And what does it mean to be an ethical and responsible agent in a technologically extended environment?
Sri Lanka’s Philosophical Inheritance
On a day such as this, it is especially appropriate to recall that Sri Lanka possesses a long and distinguished tradition of philosophical reflection. From early Buddhist scholasticism to modern comparative philosophy, Sri Lankan thinkers have consistently engaged questions concerning knowledge, consciousness, suffering, agency, and liberation.
Within this modern intellectual history, the University of Peradeniya occupies a unique place. It has served as a centre where Buddhist philosophy, Western thought, psychology, and logic have met in creative dialogue. Scholars such as T. R. V. Murti, K. N. Jayatilleke, Padmasiri de Silva, R. D. Gunaratne, and Sarathchandra did not merely interpret Buddhist texts; they brought them into conversation with global philosophy, thereby enriching both traditions.
It is within this intellectual lineage—and with deep respect for it—that I offer the reflections that follow.
Setting the Philosophical Problem
My topic today is “Embodied Cognition and Viññāṇasota: Buddhist Insights on the Extended Mind Thesis – Some Observations.” This is not a purely historical inquiry. It is an attempt to bring Buddhist philosophy into dialogue with some of the most pressing debates in contemporary philosophy of mind and cognitive science.
At the centre of these debates lies a deceptively simple question: Where is the mind?
For much of modern philosophy, the dominant answer was clear: the mind resides inside the head. Thinking was understood as an internal process, private and hidden, occurring within the boundaries of the skull. The body was often treated as a mere vessel, and the world as an external stage upon which cognition operated.
However, this picture has increasingly come under pressure.
The Extended Mind Thesis and the 4E Turn
One of the most influential challenges to this internalist model is the Extended Mind Thesis, proposed by Andy Clark and David Chalmers. Their argument is provocative but deceptively simple: if an external tool performs the same functional role as a cognitive process inside the brain, then it should be considered part of the mind itself.
From this insight emerges the now well-known 4E framework, according to which cognition is:
Embodied – shaped by the structure and capacities of the body
Embedded – situated within physical, social, and cultural environments
Enactive – constituted through action and interaction
Extended – distributed across tools, artefacts, and practices
This framework invites us to rethink the mind not as a thing, but as an activity—something we do, rather than something we have.
Earlier Western Challenges to Internalism
It is important to note that this critique of the “mind in the head” model did not begin with cognitive science. It has deep philosophical roots.
Ludwig Wittgenstein
famously warned philosophers against imagining thought as something occurring in a hidden inner space. Such metaphors, he suggested, mystify rather than clarify our understanding of mind.
Similarly, Franz Brentano’s notion of intentionality—his claim that all mental states are about something—shifted attention away from inner substances toward relational processes. This insight shaped Husserl’s phenomenology, where consciousness is always world-directed, and Freud’s psychoanalysis, where mental life is dynamic, conflicted, and socially embedded.
Together, these thinkers prepared the conceptual ground for a more process-oriented, relational understanding of mind.
Varela and the Enactive Turn
A decisive moment in this shift came with Francisco J. Varela, whose work on enactivism challenged computational models of mind. For Varela, cognition is not the passive representation of a pre-given world, but the active bringing forth of meaning through embodied engagement.
Cognition, on this view, arises from the dynamic coupling of organism and environment. Importantly, Varela explicitly acknowledged his intellectual debt to Buddhist philosophy, particularly its insights into impermanence, non-self, and dependent origination.
Buddhist Philosophy and the Minding Process
Buddhist thought offers a remarkably sophisticated account of mind—one that is non-substantialist, relational, and processual. Across its diverse traditions, we find a consistent emphasis on mind as dependently arisen, embodied through the six sense bases, and shaped by intention and contact.
Crucially, Buddhism does not speak of a static “mind-entity”. Instead, it employs metaphors of streams, flows, and continuities, suggesting a dynamic process unfolding in relation to conditions.
Key Buddhist Concepts for Contemporary Dialogue
Let me now highlight several Buddhist concepts that are particularly relevant to contemporary discussions of embodied and extended cognition.
The notion of prapañca, as elaborated by Bhikkhu Ñāṇananda, captures the mind’s tendency toward conceptual proliferation. Through naming, interpretation, and narrative construction, the mind extends itself, creating entire experiential worlds. This is not merely a linguistic process; it is an existential one.
The Abhidhamma concept of viññāṇasota, the stream of consciousness, rejects the idea of an inner mental core. Consciousness arises and ceases moment by moment, dependent on conditions—much like a river that has no fixed identity apart from its flow.
The Yogācāra doctrine of ālayaviññāṇa adds a further dimension, recognising deep-seated dispositions, habits, and affective tendencies accumulated through experience. This anticipates modern discussions of implicit cognition, embodied memory, and learned behaviour.
Finally, the Buddhist distinction between mindful and unmindful cognition reveals a layered model of mental life—one that resonates strongly with contemporary dual-process theories.
A Buddhist Cognitive Ecology
Taken together, these insights point toward a Buddhist cognitive ecology in which mind is not an inner object but a relational activity unfolding across body, world, history, and practice.
As the Buddha famously observed, “In this fathom-long body, with its perceptions and thoughts, I declare there is the world.” This is perhaps one of the earliest and most profound articulations of an embodied, enacted, and extended conception of mind.
Conclusion
The Extended Mind Thesis challenges the idea that the mind is confined within the skull. Buddhist philosophy goes further. It invites us to reconsider whether the mind was ever “inside” to begin with.
In an age shaped by artificial intelligence, cognitive technologies, and digital environments, this question is not merely theoretical. It is ethically urgent. How we understand mind shapes how we design technologies, structure societies, and conceive human responsibility.
Buddhist philosophy offers not only conceptual clarity but also ethical guidance—reminding us that cognition is inseparable from suffering, intention, and liberation.
Dr. Charitha Herath is a former Member of Parliament of Sri Lanka (2020–2024) and an academic philosopher. Prior to entering Parliament, he served as Professor (Chair) of Philosophy at the University of Peradeniya. He was Chairman of the Committee on Public Enterprises (COPE) from 2020 to 2022, playing a key role in parliamentary oversight of public finance and state institutions. Dr. Herath previously served as Secretary to the Ministry of Mass Media and Information (2013–2015) and is the Founder and Chair of Nexus Research Group, a platform for interdisciplinary research, policy dialogue, and public intellectual engagement.
He holds a BA from the University of Peradeniya (Sri Lanka), MA degrees from Sichuan University (China) and Ohio University (USA), and a PhD from the University of Kelaniya (Sri Lanka).
(This article has been adapted from the keynote address delivered
by Dr. Charitha Herath
at the International Philosophy Day Conference at the University of Peradeniya.)
Opinion
We do not want to be press-ganged
Reference ,the Indian High Commissioner’s recent comments ( The Island, 9th Jan. ) on strong India-Sri Lanka relationship and the assistance granted on recovering from the financial collapse of Sri Lanka and yet again for cyclone recovery., Sri Lankans should express their thanks to India for standing up as a friendly neighbour.
On the Defence Cooperation agreement, the Indian High Commissioner’s assertion was that there was nothing beyond that which had been included in the text. But, dear High Commissioner, we Sri Lankans have burnt our fingers when we signed agreements with the European nations who invaded our country; they took our leaders around the Mulberry bush and made our nation pay a very high price by controlling our destiny for hundreds of years. When the Opposition parties in the Parliament requested the Sri Lankan government to reveal the contents of the Defence agreements signed with India as per the prevalent common practice, the government’s strange response was that India did not want them disclosed.
Even the terms of the one-sided infamous Indo-Sri Lanka agreement, signed in 1987, were disclosed to the public.
Mr. High Commissioner, we are not satisfied with your reply as we are weak, economically, and unable to clearly understand your “India’s Neighbourhood First and Mahasagar policies” . We need the details of the defence agreements signed with our government, early.
RANJITH SOYSA
Opinion
When will we learn?
At every election—general or presidential—we do not truly vote, we simply outvote. We push out the incumbent and bring in another, whether recycled from the past or presented as “fresh.” The last time, we chose a newcomer who had spent years criticising others, conveniently ignoring the centuries of damage they inflicted during successive governments. Only now do we realise that governing is far more difficult than criticising.
There is a saying: “Even with elephants, you cannot bring back the wisdom that has passed.” But are we learning? Among our legislators, there have been individuals accused of murder, fraud, and countless illegal acts. True, the courts did not punish them—but are we so blind as to remain naive in the face of such allegations? These fraudsters and criminals, and any sane citizen living in this decade, cannot deny those realities.
Meanwhile, many of our compatriots abroad, living comfortably with their families, ignore these past crimes with blind devotion and campaign for different parties. For most of us, the wish during an election is not the welfare of the country, but simply to send our personal favourite to the council. The clearest example was the election of a teledrama actress—someone who did not even understand the Constitution—over experienced and honest politicians.
It is time to stop this bogus hero worship. Vote not for personalities, but for the country. Vote for integrity, for competence, and for the future we deserve.
Deshapriya Rajapaksha
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