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Learning and Memory

Learning and Memory. Computational Cognitive Neuroscience Randall O’Reilly. Major Types of Memory. ?. Major Types of Memory. Weight-based (changes in synapses) Long lasting, persist over distraction, etc Very high capacity Activation-based (sustained neural firing)

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Learning and Memory

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  1. Learning and Memory Computational Cognitive Neuroscience Randall O’Reilly

  2. Major Types of Memory • ?

  3. Major Types of Memory • Weight-based (changes in synapses) • Long lasting, persist over distraction, etc • Very high capacity • Activation-based (sustained neural firing) • Transient, easily lost • Very flexible: mental arithmetic, etc.

  4. Major Types of Memory • Episodic Memory: events, facts, etc • Hippocampus • Familiarity-based recognition • Perirhinal cortex: you look familiar, but… • Weight-based priming • Subconscious, can be very long-lasting • Activation-based priming • Also subconscious, but transient..

  5. Episodic Memory • Autobiographical memory (life events) • Arbitrary new memories (lab tasks) • …

  6. Classic Lab Task: AB-AC • Learn AB paired associates: • window-reason • bicycle-garbage • ... • Then AC paired associaties: • window-locomotive • bicycle-dishtowel • …

  7. AB-AC • Test on AB list: • Window ? • Bicycle ? • And AC list: • Window ? • Bicycle ?

  8. Catastrophic Interference

  9. Demo AB-AC cortical model

  10. Complementary Learning Systems

  11. Hippocampal System

  12. Sparse Activity

  13. Sparse = Pattern Separation

  14. Hippo Project • Run hip.proj

  15. Priming • Can a brief subliminal message influence your behavior?

  16. Two Forms of Memory • Priming provides good window onto weight vs. activation based memories. • Demos: wt, act priming

  17. More Robust Activation-Based Memory • In Executive Function Chapter: • PFC robust active maintenance over secs to mins • BG provides dynamic gating signal for updt vs. maint • Used for “working memory”, cognitive control..

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