Abstract
Neuronal activities were investigated in the cerebellum of immobilized and swimming goldfish Carassius auratus. Extracellularly recorded neural activities of the cerebellum in immobilized goldfish were characterized and classified into five types. Based on the waveforms and recording depths, these five neural activity types were estimated to originate from three identified classes of cerebellar neurons: Purkinje cells eurydendroid cells, and granule cells. Chronic recording of cerebellar neuron activities in unrestrained goldfish was performed for more than 100 h. During the chronic recordings, a submersible amplifier attached to the goldfish head, and a multielectrode array developed for the present study were used. Neuronal activities in the cerebellum of free-swimming fish could also be classified into five types as in the immobilized condition. Firing patterns of two neurons identified as Purkinje cells and eurydendroid cells were analyzed during turning movements of the goldfish. The firing patterns of these neurons changed in relation to turning movements. Although some improvements are required, the chronic recording method developed in the present study can be applied to further investigations concerning the direct relationship between brain neural activities and certain behavior.
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Matsumoto, N., Yoshida, M. & Uematsu, K. Recording cerebellar neuron activities in swimming goldfish. Fish Sci 73, 512–521 (2007). https://doi.org/10.1111/j.1444-2906.2007.01363.x
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DOI: https://doi.org/10.1111/j.1444-2906.2007.01363.x