The Secret to How Human Memory Is Encoded

According to secondary research, the scientific study of memory did not begin with brain scans or modern psychology — it began with self-experiments. Hermann Ebbinghaus (1850–1909) is often called the father of memory research. Long before controlled lab studies became the norm, he used himself as a subject – laboriously memorizing lists of nonsense syllables to strip away the influence of meaning. Through the experiments, he discovered two of the most important principles of memory – the learning curve which defines how a person acquires new information and the forgetting curve, which reveals how quickly unreinforced memories fade. His experiments also showed that connecting new information to prior knowledge can help memorize things better. It is this finding that shapes the educational strategies today.

In the early 1900s – other pioneers expanded on Ebbinghaus’s foundation. Ivan Pavlov’s research on classical conditioning revealed that associations could be formed between unrelated stimuli that shapes memory. Again, Frederic Bartlett introduced the idea of schemas — mental frameworks that influence how we encode and recall information. He further added that people often reshape memories to fit prior knowledge, proving that memory is not a passive record but an active reconstruction. 

Around the same time – the Gestalt psychologists proposed that perception and memory are influenced by context – the whole is more than the sum of its parts, and memories are shaped by how stimuli are organized – not just by the stimuli themselves.

By mid-century, the focus turned to the brain itself. In the year 1949 – Donald Hebb crystallized a principle that became a cornerstone of neuroscience – “neurons that fire together wire together.” His insight into how repeated activity strengthens neural connections provided a biological explanation for how memories are encoded at the cellular level.

In the cognitive revolution of the 1950s and 60s – researchers began to model memory like information processing in computers. For example – George Miller discovered that short-term memory is constrained to about seven items, plus or minus two. This discovery further inspired psychologists Alan Baddeley and Graham Hitch to introduce the working memory model in 1974 – a central part that directs attention, a phonological loop for verbal and auditory information, and a visuospatial part for images and spatial data. This model was again expanded by Baddeley in 2000 by adding the episodic buffer – a temporary store that integrates information across systems into coherent episodes. Together, these pioneers transformed memory from a philosophical curiosity into a rigorous science – setting the stage for today’s neuroscience.