8_Aplysia1 - Synaptic basis for learning: Aplysia Eric...

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Unformatted text preview: Synaptic basis for learning: Aplysia Eric Kandel & friend Rationale Lashleys work showed how difficult it would be to find an engram, at least for any kind of complex learning-- too many neurons are involved Perhaps learning could be studied in greater detail in simpler nervous systems Rationale, cont. However, this depends on the system learning It also depends on relevance--it is only worthwhile as a way of understanding learning in more complex nervous systems if they use the same mechanisms Thus the basis for this study is evolutionary--that mechanisms discovered in creatures with simpler nervous systems also occur in us because we are both descended from common ancestors Aplysia has a simple nervous system Neurons in 9 ganglia ~20,000 neurons in total Clear nerves leading to and from ganglia Many cells are huge, consistently located, and easy to study Abdominal ganglion Reduction is possible The nervous system, nerves and pieces of attached skin will survive in vitro Individual neurons also survive and grow in culture But does it learn? Walks Eats Avoids predators, pain Has sex ? But does it learn? But does it learn? Habituation Sensitization Dishabituation The Behavior On being touched, the gill and siphon are withdrawn for some period of time The Behavior-2 Habituation/Dishabituation Sensitization After shocking the tail, later touches to the siphon produce increased motor responses Anatomy At its simplest, sensory neurons...
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This note was uploaded on 02/09/2010 for the course BIO 3280 taught by Professor Devoogd, t during the Spring '10 term at Cornell University (Engineering School).

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8_Aplysia1 - Synaptic basis for learning: Aplysia Eric...

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