Overview
This lecture covers the types of memory, models and processes involved in memory storage, and distinctions between declarative and non-declarative memory, including retrieval mechanisms and examples.
Types and Processes of Memory
- Learning involves strengthening synapses and precedes memory formation.
- Memory formation requires encoding information into a memory trace within neural pathways.
- Storage of memory can be temporary (short-term) or permanent (long-term).
- Retrieval brings memory traces back to a usable form and can be explicit (conscious) or implicit (unconscious).
Memory Classification and Models
- Sensory memory is brief and tied to perception (e.g., iconic for vision, echoic for audition).
- Short-term memory is temporary, limited in capacity (about 4 to 7 items), and uses phonological coding.
- Working memory replaces short-term memory in modern models and includes visuospatial sketchpad, phonological loop, episodic buffer, and central executive.
- Long-term memory is potentially unlimited and stores information over extended periods, mostly in visual form.
- Consolidation is the process of transferring information from short-term to long-term memory.
Declarative and Non-Declarative Memory
- Declarative (explicit) memory: consciously retrievable, includes episodic (events) and semantic (facts) memory.
- Episodic memory is autobiographical, time-specific, and self-referential.
- Semantic memory stores general facts and knowledge not tied to specific events.
- Non-declarative (implicit) memory: retrieved without conscious effort, includes procedural memory, priming, classical conditioning, and non-associative learning.
- Procedural memory involves motor skills and habits, is slow to acquire, and highly resistant to forgetting.
Retrieval Mechanisms and Examples
- Explicit memory involves intentional recall, such as during exams.
- Implicit memory influences behavior without conscious awareness, such as priming or conditioned emotional responses.
- Amnesia case studies illustrate implicit memory functioning even without explicit recall (e.g., handshake example).
Key Terms & Definitions
- Encoding — Process of creating a memory trace from learned information.
- Consolidation — Conversion of short-term memory into long-term memory.
- Reconsolidation — Modification and restorage of reactivated long-term memories.
- Declarative Memory — Memory that can be consciously recalled (episodic and semantic).
- Non-Declarative Memory — Memory retrieved without conscious awareness (procedural, priming, conditioning).
- Working Memory — Active processing system with multiple components for manipulating information.
Action Items / Next Steps
- Review the distinctions between types of memory (sensory, short-term, working, long-term).
- Reflect on examples of declarative and procedural memories from personal experience.
- Prepare for potential quiz questions on the processes and types of memory discussed.