Chapter 6: Memory Processes, Storage, and Consolidation

Overview of Memory

• Memory: The ability to store and retrieve information over time.

  • Memory Aid: Like a computer entering, saving, and opening files.

• Constructive Nature: Memories are built by linking new information to what you already know, not recorded like a video.

  • Memory Aid: Building with Legos—attaching new blocks onto an existing base.

• Three Key Functions (ESR):

  • Encoding: Turning thoughts and perceptions into memories.

  • Memory Aid: Encode = Enter data.

  • Storage: Keeping information saved over time.

  • Memory Aid: Storage = Save data.

  • Retrieval: Bringing stored memories back to mind.

  • Memory Aid: Retrieval = Recall data.

Encoding Mechanisms

• Semantic Encoding: Connecting new information to existing knowledge based on meaning.

  • Memory Aid: Semantic = makes Sense.

• Visual Imagery Encoding: Storing ideas by turning them into mental pictures.

  • Memory Aid: Visual = Vision snapshot.

• Organizational Encoding: Grouping items into categories based on relationships.

  • Memory Aid: Organizing items into labeled folders.

Memory Storage Systems

• Sensory Memory: Holds sensory details for a few seconds or less.

  • Iconic Memory: Fast-fading visual memory lasting approximately $1\,\text{second}$.

  • Memory Aid: Icon seen with the eyes.

  • Echoic Memory: Fast-fading sound memory lasting approximately $5\,\text{seconds}$.

  • Memory Aid: Echo heard with the ears.

• Short-Term Memory: Holds nonsensory info briefly (under a minute).

  • Capacity: Holds about $7$ items.

  • Memory Aid: The "Lucky $7$" limit.

  • Rehearsal: Repeating information to keep it in mind.

  • Memory Aid: Rehearsing lines in a play.

  • Chunking: Grouping small bits into larger clusters (e.g., phone numbers).

  • Memory Aid: Taking bite-sized chunks instead of swallowing everything at once.

• Long-Term Memory: Stores information for hours, years, or a lifetime with no capacity limit.

  • Memory Aid: Long = Lifetime storage.

Consolidation and the Brain

• Consolidation: The process of stabilizing memories in the brain, reinforced by recall.

  • Memory Aid: Wet cement setting until it is solid.

• Reconsolidation: Recalling a memory makes it temporarily fragile, requiring it to stabilize again.

  • Memory Aid: Re-saving an opened file.

• Hippocampus Role: Critical for stabilizing long-term memories, but does not store them permanently.

  • Memory Aid: A librarian processing and cataloging books before sending them to the shelves.

Memory Disorders

• Anterograde Amnesia: Inability to make new long-term memories after trauma.

  • Memory Aid: Anterograde = cannot form memories moving Ahead.

• Retrograde Amnesia: Inability to recall memories from before an event or injury.

  • Memory Aid: Retrograde = cannot look back at the Retro past.