PSYC 2330 Lecture Notes - Lecture 4: Aplysia, Sensory Neuron, Motor Neuron

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Experiments performed in the aplysia have demonstrated that habituation is caused by: increase in withdrawal reflexive reactions, reduction of interest in the task, reduction of pool of synaptic vesicles, expression of synaptic extracellular potassium, increase in intracellular sodium. This tiny space is called the synaptic cleft: the action potential travels to the presynaptic terminal and releases neurotransmitters into the synaptic cleft, most drugs that alter cognitive functions achieve their effects by changing regular synaptic functioning. It is possible to change how long neurotransmitters are released into the postsynaptic cleft. The time it takes to reset depends on how long you were habituated: sensitization is not always reversible because its mechanisms are much more complex, learning means that behaviour is changing as the result of experience. 5 shocks causes a change in anatomy: new synapses grow which is what causes sensitization, this restructuring causes more permanent sensitization, alergies can be a form of sensitization.

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