PSYC 325 Chapter Notes - Chapter 3: Perceptual Learning, Neuromodulation, Dishabituation
27 Nov 2020
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It"s di cult to answer with millions of neurons in the rat brain. 1: aplysia californica, the sea hare, has only 20,000 neurons in its cns; the neurons are very large and consistent between animals, these features have made aplysia popular for understanding the neural mechanisms of learning and memory. https://www. nobelprize. org/nobel_prizes/medicine/laureates/2000/press. html. Gill-withdrawal re ex: touch the tail, siphon, or mantle, 10-12 light touches to achieve full habituation lasting 10-15 min, the gill contracts within the mantle, time to relaxation and/or amount of contraction is measured. 2: gentle touch to mantle produces gill withdrawal, progressively smaller (or shorter) withdrawals, recovers quickly but, with many sessions, becomes long-lasting. Dishabituation after strong stimulus to neck: repeated touch leads to less release of transmitter by sensory neuron: synaptic depression (a reduction in synaptic transmission), homosynaptic e ect: involves only those synapses involved in the event.
