PSYCH 050: Biology of Memory

This chapter explores how memory is encoded, stored, and retrieved within the brain - not as a static archive, but as a dynamic and evolving biological process.Memory begins with encoding, where experience is transformed into neural activity. This is followed by consolidation, during which fragile traces are stabilised through synaptic and systems-level changes. Retrieval then reactivates these traces, bringing them back into conscious awareness - but each act of recall subtly reshapes the memory itself.At a neurobiological level, memory depends on distributed networks. The hippocampus plays a central role in forming new episodic memories, while cortical regions store long-term representations. Emotional memory involves structures such as the amygdala, which modulate the strength and salience of encoding.A key theme is plasticity. Long-term potentiation and related mechanisms allow synapses to strengthen with repeated activation, forming the cellular basis of learning and memory. Yet this plasticity also means that memory is inherently malleable - vulnerable to distortion, reconsolidation, and forgetting.Clinically, this has profound implications. Disorders of memory range from amnesia to intrusive recollections, as seen in trauma-related conditions. Memory is not simply lost or preserved - it can be fragmented, amplified, or reshaped.This chapter reframes memory as an active process - one that continuously integrates past experience with present context.Key Takeaways* Memory involves encoding, consolidation, and retrieval.* The hippocampus is central to forming new episodic memories.* Long-term memory is stored across distributed cortical networks.* Synaptic plasticity underpins learning and memory formation.* Emotional arousal influences memory strength and salience.* Memory is reconstructive and can be altered with each retrieval.* Clinical disorders of memory reflect disruptions in these processes. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe