Đề dự đoán IELTS Reading Tháng 6/2026

The Elasticity of Time

A.  While clocks and calendars measure time in precise, unvarying increments, the human experience of time is profoundly subjective. A single hour spent waiting in a sterile clinical room can feel like an eternity, whereas a weekend spent with close friends can seemingly vanish in an instant. This phenomenon, which psychologists refer to as the “elasticity of time,” highlights a fundamental truth about human neurobiology: our brains do not possess a single, dedicated biological clock that perfectly synchronizes with mechanical time. Instead, our perception of duration is a complex illusion constructed by various neural networks working in tandem.

B.  A key biological driver behind this elasticity is the neurochemical dopamine, a neurotransmitter heavily involved in the brain’s reward and pleasure centers. Research indicates that when a person is engaged in a highly stimulating or enjoyable activity, dopamine levels surge. This neurochemical flood effectively accelerates the brain’s internal timekeeper. Consequently, the individual processes fewer “time frames” per minute, causing the external duration to appear as though it has passed much faster than it actually has. Conversely, during periods of boredom or discomfort, dopamine levels drop, prompting the brain to hyper-focus on the passage of time itself, making every second feel agonizingly prolonged

C.  This neurochemical mechanism is further complicated by how we store memories, a concept popularised by broadcaster and psychology writer Claudia Hammond as the “Holiday Paradox.” Hammond observed that when individuals take a vacation to a new and exotic destination, the days seem to fly by in the moment. However, when they return home and look back on the trip in retrospect, the holiday feels as though it lasted much longer than a few days. This paradox occurs because the brain relies on the volume of new memories to estimate past duration. A routine week at work generates very few novel memories; thus, it feels short in retrospect. A vibrant holiday, packed with unfamiliar sights, sounds, and experiences, creates a dense tapestry of new neural connections. When the brain later retrieves these dense memory banks, it misinterprets the sheer volume of data as a longer period of time.

D.  The relationship between memory formation and time perception also offers an explanation for why time seems to accelerate as we age. The “habituation theory” posits that children experience a world where almost everything is novel. Every train ride, new taste, and social interaction requires intense cognitive processing and memory storage. Because their brains are recording so much fresh data, childhood feels expansive. For older adults, however, most daily experiences are heavily routinized. The brain, seeking to conserve energy, stops recording mundane, repetitive events. With fewer new memories being laid down, the adult brain looks back on a month or a year and, finding remarkably little new data, concludes that the time must have passed rapidly.

E.   In extreme circumstances, such as moments of mortal peril, time perception can distort radically. For decades, survivors of car crashes and natural disasters have reported that the traumatic event seemed to unfold in “slow motion.” To test this, neuroscientist David Eagleman conducted an experiment where volunteers were dropped from a 150-foot tower into a safety net, experiencing a terrifying free-fall. After the drop, participants estimated their fall time to be significantly longer than the actual physical duration. Eagleman’s neuroimaging revealed that time does not actually slow down in the brain during a crisis. Instead, the amygdala—the brain’s emergency control center—kicks into overdrive, recording the traumatic memory with immense, high-resolution detail. When the survivor recalls the event milliseconds later, the density of the memory makes the event feel stretched out.

F.  Modern cognitive scientists are now investigating how the digital age is uniquely altering our internal clocks. With the advent of smartphones and social media, human attention is increasingly fragmented. Users rapidly shift their focus between short videos, text messages, and news alerts, creating a constant state of mild cognitive overload. Preliminary studies suggest that this continuous context-switching disrupts the brain’s ability to encode continuous memory sequences. As a result, heavy technology users frequently report a phenomenon known as “time blindness,” where large chunks of the day disappear without the individual being able to accurately recount how the hours were spent.

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