120ALecture4Handout

120ALecture4Handout - Connectionism Pandemonium...

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Connectionism • Pandemonium • Connectionism = parallel processing Units (neurons) Connections (synapses) • Representations • Processing A problem with cognitive models of pattern recognition • How match vs many items in LTM? – Have huge number of possibilities • Serial processing: one at a time – Would take way too long • Parallel processing: many at once – Brain seems to be work like this • Mini-revolution in cog. psych Pandemonium Model • Before connectionism established – Units are called “demons” • DEMONSTRATION
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Lessons of the pandemonium model • Model worked reasonably well! • Some of model’s properties resemble human behavior. Works OK on degraded input Works OK on novel input • Makes plausible mistakes • Q: What are representations? – Processing? Modern Connectionism E F E F a a a a a a a Time 1 Time 2 F F
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Modern Connectionism Units Neurons or groups of neurons Active or not active Connections
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120ALecture4Handout - Connectionism Pandemonium...

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