Cell Body (soma)

1. Action Potential Post- synaptic Cell Body (soma) Synapse Presynaptic Axon Terminal Dendrites (pages 56-57)

2. Synapse - + - + - + Action Potential + + T T T T T T T T T T T T T T T Vesicles containing Neurotransmitter Terminal Receptor T Depolarization axon dendrite Synaptic cleft or gap

3. Water spray Mantle Gill Withdrawal Gill Siphon

4. Habituation Spontaneous recovery

5. Learning-Performance Distinction (again) Other reasons for decreased response? Sensory Adaptation Motor Fatigue For it to be “learning” must be a change in the processing of information in the nervous system.

6. Siphon Neck Gill Mantle NO Sensory Adaptation? 1. Record SN---no decrease in response 2. Stimulate SN---still habituation Gill Motor Neuron Siphon Sensory Neuron

7. Siphon Neck Gill Mantle NO Motor Fatigue? 1. Record MN---decrease in response 2. Stimulate MN---no decreased response Gill Motor Neuron Siphon Sensory Neuron

8. Remember Dual Process Theory Q: Is dishabituation the loss of H, or the addition of S? If loss of H: increased response should be specific to siphon-gill reflex If add S: increased response should be general to all refexes Answer? Test other reflexes

9. Conclusion: Habituation to Siphon does not generalize to Mantle

10. Both Responses Increase: Supports Dual Process; Suggests Dishabituation is a form of Sensitization

11. Siphon Neck Gill Mantle Interneuron S.N. S.N. Gill Motor Neuron Siphon Sensory Neuron

12. Synapse T + + + T + + T T T T T T T T T T T T T Habituation: Decreased NT Release Receptor T axon Vesicles containing Neurotransmitter dendrite

13. From interneuron T + + + T N + N + T N T T T T T T T T T T T T T T T T axon dendrite Sensitization: Increase in NT release