Action Potential
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Action Potential. Post- synaptic. Cell Body (soma). Synapse. Presynaptic. Axon. Terminal. Dendrites. (pages 56-57). Synapse. -. +. -. +. -. +. Action Potential. +. +. T. T. T. T. T. T. T. T. T. T. T. T. T. T. T. Vesicles containing Neurotransmitter. Terminal.

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Cell Body (soma)

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Cell body soma

Action Potential

Post-

synaptic

Cell Body (soma)

Synapse

Presynaptic

Axon

Terminal

Dendrites

(pages 56-57)


Cell body soma

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


Cell body soma

Water spray

Mantle

Gill

Withdrawal

Gill

Siphon


Cell body soma

Habituation

Spontaneous

recovery


Cell body soma

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.


Cell body soma

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


Cell body soma

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


Cell body soma

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


Cell body soma

Conclusion: Habituation to Siphon does not generalize to Mantle


Cell body soma

Both Responses Increase: Supports Dual Process;

Suggests Dishabituation is a form of Sensitization


Cell body soma

Siphon

Neck

Gill

Mantle

Interneuron

S.N.

S.N.

Gill Motor Neuron

Siphon Sensory Neuron


Cell body soma

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


Cell body soma

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


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