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Journal of Neuroscience, Vol 16, 843-852, Copyright © 1996 by Society for Neuroscience
Interactions between the neural networks for escape and swimming in goldfish
KR Svoboda and JR Fetcho
Department of Neurobiology and Behavior, State University of New York at Stony Brook 11794-5230, USA.
Interactions between neural networks for different motor behaviors occur
frequently in nature; however, there are few vertebrate models for studying
these interactions. One potentially useful model involves the interactions
between escape and swimming behaviors in fish. Fish can produce escape
bends while swimming, using some of the same axial muscles for both
behaviors. Here we study the interactions between escape and swimming in a
paralyzed goldfish preparation in which we can activate the networks for
both behaviors. Fictive swimming was elicited by electrical stimulation in
the midbrain locomotor region. During the swimming, we fired a single
action potential in the reticulospinal Mauthner (M) cell, which initiates
the escape behavior (Zottoli, 1977). Firing the M cell overrode the
swimming motor output to produce an output appropriate for escape
regardless of the phase of swimming at which it was fired. The M cell also
could reset the swimming rhythm dramatically in a way that led to a smooth
transition from an escape bend to one side into subsequent swimming. Both
the override and reset supported predictions based on previous studies of
the organization of the M-cell network. They apparently allow for a well
coordinated motor output when a fish must produce an escape while swimming.
The potent effects of one action potential in a single, identifiable
reticulospinal neuron make this an attractive model system for future
studies of the cellular basis of interactions between descending pathways
and spinal rhythm-generating networks.
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