ISSN:
1432-1351
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary A similar sequence of behavioral effects was observed for either cooling or heating; most effects occurred on changing temperature of entire fish or of only the cerebellum. On moderate heating or cooling, fish are hyperexcitable, spontaneously hyperactive; on further heating or cooling swimming is uncoordinated; when the subcerebellar structures are heated or cooled, equilibrium is disturbed; on further heating or cooling coma and respiratory failure ensue. Critical temperatures are modifiable by acclimation. The behavioral effects of cerebellectomy are additive with temperature effects on motor centers. Electrical activity of Purkinje neurons changes in the same thermal ranges as behavior. Inhibition via cerebellar interneurons is most sensitive and can be modified by acclimation. Ongoing activity increases with warming up to a blocking temperature; interspike interval histograms show pattern changes during warming. Activation via mossy fibers-granule cells is more sensitive than that via climbing fibers, and antidromic impulses are most resistant. A neuronal model based on inhibitory actions of Purkinje neurons on motor centers and parallel feedback excitatory pathways can explain both behavioral and electrical observations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00612674
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