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Figure 10


Fig. 10. Further evidence of the different mechanisms of generation of V1 and V2 can be obtained by fish curarization, which blocks transmission at the neuro-electrocyte junction. The dose was adjusted to be just enough to stop breathing but not enough to completely block the discharge. (A) The head-to-tail equivalent electromotive force of a fish in control (black) and curarized (red) conditions. (B) The spatial profile of the first negative deflection in control (black) and curarized (red) conditions. Note the differential effect on V1 and V2; V1 is the less affected component because it is generated by the subthreshold activation of the rostral membranes of doubly innervated electrocytes. V4 is absent because the amount of current generated by V3 is subthreshold for generating an action potential at the rostral faces of single innervated electrocytes.





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