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aplysia_wn - Aplysia Gill Withdrawal Reflex Aplysia will...

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Aplysia Gill Withdrawal Reflex Aplysia will withdraw its gill. in response to 1) 2) Habituation: After repeated touches, Aplysia “learns” to no longer withdraw gill. Cellular mechanism of habituation: After repeated firing of action potentials in sensory neuron, Ca++ channels in the terminal deactivate. What is the effect of this deactivation? a strong or noxious stimulus to the head or tail, a touch on the mantle or siphon, or Voltage-gated Ca 2+ channels deactivate after neuron fires repeated action potentials Less calcium enters terminal, less transmitter is released. Less transmitter is released. Habituation: After repeated touches to the siphon or mantle, Aplysia “learns” to no longer withdraw gill to siphon or mantle touch. Additionally, vesicles are depleted from the terminal. What is the effect of this depletion?
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Sensitization or dishabituation: A noxious stimulus to the head or tail will increase the strength of the gill withdrawal reflex in response to siphon or mantle stimulation. Cellular mechanisms of sensitization and dishabituation: 10 Steps (8) AP in sensory neuron terminal is positive longer. (1) Serotonin released by facil interneuron onto terminal of siphon sensory neuron (4) this increases cAMP (2) (3) (5) (6) (7) (9) (10) Associative learning: Aplysia can learn to associate a non-noxious stimulus (e.g. A very light touch to the siphon) with a noxious stimulus (e.g. A strong poke to the head). Before conditioning, the animal will not exhibit the gill withdrawal reflex in
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aplysia_wn - Aplysia Gill Withdrawal Reflex Aplysia will...

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