Campus Times | Lucknow

Why do lessons once memorised in classrooms fade as we grow older? Experts in Cognitive Science say the answer lies in how the human brain develops, stores, and prioritises information over time.

One of the primary reasons is Childhood Amnesia. In the early years, the brain—particularly the hippocampus, which plays a key role in memory formation—is still maturing. As a result, many memories formed during childhood fail to consolidate into long-term storage.

Another factor is the nature of early learning itself. Much of school education in the initial years relies on memorisation rather than deep understanding. Without repeated use or meaningful engagement, such information tends to fade, a process explained by Memory Decay Theory.

Experts also point to Neural Pruning—a natural process where the brain removes weaker or unused neural connections to improve efficiency. As individuals grow, the brain retains what is frequently used and discards what is not, leading to the gradual loss of early academic memories.

The learning environment plays a crucial role as well. When knowledge is not linked to real-life application or emotional context, it is less likely to be retained. Rote learning, still prevalent in many systems, often limits long-term memory formation.

Changing Memory Patterns

Recent studies in developmental neuroscience have added fresh insights to this phenomenon. Researchers note that rapid brain growth in children, including the formation of new neurons, can interfere with previously stored memories. This ongoing brain plasticity makes early memories more fragile.

At the same time, modern lifestyle changes are influencing how memory works. Increased screen time and reduced face-to-face interaction are affecting attention spans and deep learning abilities. Experts describe this shift as “cognitive offloading,” where reliance on digital devices reduces the need to store information internally.

Research also highlights the importance of “retrieval practice”—actively recalling information multiple times—to strengthen long-term memory, as opposed to passive reading or repetition.

Experts emphasise that active engagement remains the most effective way to retain knowledge. Techniques such as storytelling, discussion, teaching others, and real-world application significantly improve memory retention.

Forgetting what we studied in childhood, experts say, is not a sign of poor intelligence but a reflection of how the brain functions. It prioritises meaning over memorisation, experience over exposure. In essence, what stays with us is not what we merely studied, but what we understood, applied, and truly lived.