Learning and Memory Computational Cognitive Neuroscience Randall O’Reilly.

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Presentation transcript:

Learning and Memory Computational Cognitive Neuroscience Randall O’Reilly

Major Types of Memory ? 2

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. 3

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.. 4

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

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

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

Catastrophic Interference 8

Demo AB-AC cortical model 9

Complementary Learning Systems 10

Hippocampal System 11

Sparse Activity 12

Sparse = Pattern Separation 13

Hippo Project Run hip.proj 14

Priming Can a brief subliminal message influence your behavior? 15

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

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.. 17

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