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Stimulus‐Evoked Changes in Extracellular Calcium in Optic Tectum of the Goldfish: Possible Role in Neuroplasticity

It has been proposed that specific ependymin glycoproteins, which show increased synthesis in the goldfish brain after training and form insoluble aggregates when calcium levels are artificially lowered by dialysis and chelation, are involved in a structural alteration of neural circuits that may provide a basis for learning and memory.',z Since repetitive stimulation can evoke an intracellular accumulation and highly localized extracellular depletion of Ca2+ in brain regions such as the hippothe possibility that neuronal activity could produce similar detectable changes in synaptic regions of the goldfish brain has been explored. Optic tecta, isolated from the brain of the goldfish (Carassius auratus) were placed in a tissue bath at 22-24°C in Ringer solution that was in equilibrium with 1% CQ/