12 min • 1 lectures
This course provides an overview of the 1973 study by Bliss and Lømo, which established the concept of long-term potentiation. The experiment focused on the hippocampi of anesthetized rabbits, specifically looking at how electrical signals travel from the perforant path to the dentate gyrus. By applying a high-frequency burst of electrical stimulation—called tetanus—to the input pathway, the researchers discovered they could change how the receiving neurons responded for a long period. Instead of returning to baseline, the synapses stayed potentiated, meaning they produced a stronger electrical response to the same level of input for several hours. This discovery proved that synaptic connections are not static; they can be strengthened through their own activity. The material explains technical terms like excitatory postsynaptic potentials and population spikes in simple language, framing them as measures of synaptic communication and collective cell firing. Beyond the original data, the course connects these findings to broader neuroscience topics like neuroplasticity, prediction error, and learning. It also touches on how later research, such as the role of NMDA receptors and AMPA trafficking, built upon this foundational work. While the study uses an animal model under anesthesia, it remains the primary cellular mechanism used to explain how brains store information. Listeners will gain a clear understanding of why this specific paper transformed the study of memory from a psychological concept into a measurable biological process.
