21 topics with concise breakdowns: definitions, key facts, and class questions.
Memory is not merely an abstract concept, but a strict neurophysiological process. In this section, we examine how the nervous system encodes, stores, and retrieves information based on cellular and network mechanisms.
The material is structured logically: from classification (sensory, short-term, long-term memory and their stages) to deep neurobiology. We thoroughly analyze the brain structures involved in memory formation, including the Papez circuit. You will study the electrophysiological foundations (reverberation of excitation, post-tetanic potentiation) and modern theories of memory trace (engram) formation—morphological, glial, neurotransmitter, immunological, and molecular, with a focus on memory proteins and neuropeptides.
What is most frequently asked in class? During colloquia, instructors love to demand a detailed description of the Papez circuit and the mechanisms of transition from short-term to long-term memory (consolidation). Be sure to understand the essence of post-tetanic potentiation and the molecular theory—these are fundamental questions where half the class stumbles.
What is memory from the perspective of normal physiology?
This is the basic ability of living organisms to remember, store, and retrieve information about previously experienced events, which is inextricably linked with learning processes.
What is the mechanism of information selection in short-term memory?
Short-term memory evaluates the significance of data. If the information is important for meeting leading needs, it transitions into intermediate and then long-term memory. Unimportant information is quickly forgotten.
What successive stages does the memory process consist of?
The process includes four stages: 1) perception, encoding, and memorization, 2) storage, 3) retrieval of necessary information, and 4) forgetting.
Why do we not see darkness when we blink?
This occurs exclusively thanks to sensory memory, which holds the visual image for 50–500 milliseconds. This instantaneous imprint ensures a seamless and continuous perception of the external world during a brief blink.
What is the physiological basis of short-term memory?
Its basis is the reverberation of excitation — the process of nerve impulse circulation through closed circuits formed by pyramidal neurons and their collaterals connected to interneurons.
What is the concept of "neural traps"?
These are closed loop circuits of interconnected neurons described by Lorente de Nó. Through their collaterals, excitation returns to the original cell, ensuring prolonged impulse circulation.
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