Learning and memory
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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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Learning and memory

Learning and Memory

Computational Cognitive Neuroscience

Randall O’Reilly


Major types of memory

Major Types of Memory

  • ?


Major types of memory1

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.


Major types of memory2

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..


Episodic memory

Episodic Memory

  • Autobiographical memory (life events)

  • Arbitrary new memories (lab tasks)


Classic lab task ab ac

Classic Lab Task: AB-AC

  • Learn AB paired associates:

    • window-reason

    • bicycle-garbage

    • ...

  • Then AC paired associaties:

    • window-locomotive

    • bicycle-dishtowel


Ab ac

AB-AC

  • Test on AB list:

    • Window ?

    • Bicycle ?

  • And AC list:

    • Window ?

    • Bicycle ?


Catastrophic interference

Catastrophic Interference


Learning and memory

  • Demo AB-AC cortical model


Complementary learning systems

Complementary Learning Systems


Hippocampal system

Hippocampal System


Sparse activity

Sparse Activity


Sparse pattern separation

Sparse = Pattern Separation


Hippo project

Hippo Project

  • Run hip.proj


Priming

Priming

  • Can a brief subliminal message influence your behavior?


Two forms of memory

Two Forms of Memory

  • Priming provides good window onto weight vs. activation based memories.

    • Demos: wt, act priming


More robust activation based memory

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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