By Geewananda Gunawardana –

Dr. Geewananda Gunawardana

“Craving begets sorrow, craving begets fear. For him who is free from craving there is no sorrow; how can there be fear for him,” Dhammapada verse 216 states. The mental factor craving, Tanha in Pali, is central to Buddhist Teaching, as its ultimate goal is the cessation or extinction of it—tanhakkhaya. Even though Tanha is translated as craving here, it can sometimes mislead modern readers into thinking tanha only refers to extreme or physical addictions. Just as with any Pali term, it has broad meanings. Venerable Walpola Rahula describes it as “thirst” or unceasing wanting, one of the deep-rooted proclivities or latent tendencies (anusaya) of life (Rahula 1959), without which life as we know would not exist.

Even though the Buddha recognized this natural phenomenon two and a half millennia ago, it was only in the late twentieth century that science took note of it and gave it a captivating term—the Hedonic Treadmill. The advantage of this empirical investigation to us Buddhists is that it provides a way to gain penetrative, experiential comprehension (anubodha) of this concept using the vernacular of this technology-savvy age—an alternative to struggling with the language of a bygone era. These investigations have revealed that there are no hard-to-comprehend metaphysical or mysterious elements involved with this phenomenon; it is a biochemical process fundamental to sustaining life. What is more, an effort to grasp this concept would be well within the goals of Vipassana meditation described in the Sutta Pitaka, incorporating the four elements of investigation: body (kayanupassana), sensations (vedananupassana), mind (chittanupassana), and natural laws (dhammanupassana).

Vipassana and Modern Science

Vipassana meditation is an in-depth exploration of how humans perceive the world, gain knowledge, and interact with themselves and the environment. Knowing this with wisdom allows one to lead a harmonious way of life (samadhi), a condition conducive to curbing the “thirst” and achieving the Buddhist ideal. The goal of modern science is also to investigate life, but humanity has often used that knowledge to increase material wealth and comfort, providing only lip service to spirituality on the fringe. An attitude that tends to ignore the consequences of wanting more and more – thirst, potentially endangering the planet. However, that does not prevent us from using scientific information as and aid or a tool to grasp Buddhist concepts. The scientific method bears parallels to the Buddhist approach: it is based on causality (paticcasamuppada), empirical verification (ehipassiko), systematic observation (meditation), and rejecting dogma and beliefs. The primary difference is simply the vocabulary used.

The Process of Perception: Five Aggregates

Our five external sense organs receive data (vedana) containing information on the environment: Eyes: receive light, Ears: receive sound, Skin: senses physical contact and temperature, Nose & Tongue: sense chemical properties of substances. The data received by the sense organs is transmitted to the brain, where it is registered as neural networks (sanna). Neural networks, which are interconnected groups of nerve cells (neurons) can be viewed as mind-readable QR codes. The activity of the brain, or mind (mano), processes this data and converts them into actionable information (sankhara). Modern neuroscience and psychology have made great advances in understanding these processes at the molecular level. This process allows the individual to become aware of their environment, build an autobiographical memory or the notion of a self (atta), and take actions to protect and perpetuate life.

The Pali term vinnana refers to the collection of information committed to memory. Translating vinnana as “consciousness” can be confusing, as the latter often refers to all brain activities. All physical phenomena that sense organs encounter and the mental constructs (sankhara) are referred to as Rupa. This activity of mind forms the basis of all knowledge, representing the entire world as perceived by the individual. This process is what the Teaching refers to as the Five Aggregates (pancakkhanda). The critical takeaway is that the world we perceive is merely a mental construct. While an objective world exists, our sense organs have limitations in seeing it—a fact easily realized through the hundreds of illusions used for entertainment.

Evolution and Emotion

The evolutionary purpose of this data processing mechanism is to enable living beings to respond to environmental factors for survival. The psychological and physiological state that arises prior to acting is called emotion. Primarily, emotions can be of three kinds: desire (loba) – seeing a new phone causes an urge to buy it, even though the current one works fine; aversion (dosha) – encountering a vicious dog triggers a “fight or flight” response; delusion (moha) or illusion – an unanswered message to a loved one triggers worry or speculation. Thus, tanha or thirst represents how we connect to the world in its entirety; it can be desire, aversion, and delusion, not merely simple greed. Consequently, these are natural phenomena beyond our immediate control, which are intended to sustain life. In other words, emotions are the forerunner to volitions or intentions, which the Teaching defines as kamma.

The Biochemistry of Craving

Emotions result from the interaction between the nervous system and biochemicals known as neurotransmitters and neuromodulators (e.g., dopamine, serotonin, epinephrine, GABA, glutamate, acetylcholine, and endorphins). Just as the Buddha’s simile of two bundles of bamboo supporting each other describes, these two processes are interdependent and co-arising. Every thought or emotional state corresponds to patterns of neural firing. When neurons fire, they release these chemicals into synapses, influencing how one feels and acts. This release perturbs the body’s normal balance, or homeostasis. Once an action is complete, these chemicals are reabsorbed, and the body returns to its baseline.

Return to baseline is essential for survival. For example, if we stay satisfied with just one meal forever, we could not sustain life. Nature has developed another mechanism to prevent us from being satisfied – we also habituate. In the case of dopamine, the brain adapts by reducing the response to the same stimulus. To get the same level of satisfaction with repeated experiences, the amounts of neurotransmitters needed keeps increasing. This leads to the cycle of craving and dissatisfaction—the Hedonic Treadmill. You “run” toward happiness on the treadmill, but it does not take you anywhere, leaving you in the same emotionally unsatisfactory state, wanting more and more.

Breaking the Cycle

This explains why achievements and possessions do not bring permanent happiness, and lead to a cycle of struggle, addiction, crime, and other ills of society. For Buddhists, it also explains why we cling to meaningless rituals. The Dhamma captured this complex phenomenon in the Four Noble Truths: pleasant experiences are impermanent (anicca), leading to grasping (tanha) and unsatisfactoriness (dukkha). The remedy is the Eightfold Path that involves wisdom (panna), conduct (sila), and harmony (samadhi).

Neuroplasticity and the Point of Liberation

While we cannot stop the sense organs from receiving stimulation (vedana) and sending them to brain, the mind can be developed to prevent vedana from leading to tanha. This is the “point of liberation,” the seventh link in the paticcasamuppada formula. We may not have free will, but we have ‘Free Won’t’ or the ability to say no to the natural tendency to act upon stimuli. We can rewire our neural connections to do so. This ability can be cultivated by practice and repetition, and neuroscience refers to it as neuroplasticity—the brain’s ability to change with experience.

The natural tendency of brain is to strengthen frequently used neural networks while weakening and eliminating lesser used networks and building new ones as needed. This is known as neural plasticity or rewiring brain. As described in the Eight-fold Path, the way to weaken and eliminate dopamine-driven neural networks includes three aspects. First, the process leading to thirst must be understood. One must engage in sila – activities and thoughts that cultivate Metta: loving-kindness and goodwill, Karuna: compassion, Mudita: appreciative joy, and Upekkha: equanimity, emotional stability, calmness, and evenness of mind in the face of gain and loss, praise and blame, fame and disrepute, pleasure, and pain. That must be done with wisdom, ritualistic behavior does not strengthen the correct neural networks. These activities promote a “cocktail” of oxytocin, serotonin, and GABA, subduing the role of dopamine and helping us step off the Hedonic Treadmill. This leads to a tranquil state of mind and a harmonious existence – samadhi. Again, it is an interdependent, co-arising process that improves upon repetition. Using mind altering substances hijacks this process, thus the need for adhering to the Fifth Precept.

The goal of Vipassana is to understand this process and train the mind to say “no” to tanha. It is not just about sitting on a mat; it requires developing a lifestyle that maintains homeostasis or harmony, samadhi, at every moment. Pali term bhavana means the development of wisdom and insight. In modern vernacular – rewiring brain. This model must be assessed for its efficacy by the individual and realize the benefits by themselves –ehipassiko; knowledge without practice does not work. According to what the Buddha taught, that is the path to cessation or extinction of craving – tanhakkhaya, the supreme goal.