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Fig. 1. The low-responsiveness window of the fast electrosensory pathway is
elicited by natural (A) and artificial (B–D) stimuli. (A) Field
potentials evoked by the self-(black triphasic artifact around time zero in
each trace) and conspecific (green)-generated EODs at the magnocellularis
nucleus in a freely moving fish. The triphasic waveform at the beginning of
each trace (labeled 1–5) is the sEOD artifact, followed by a spike
corresponding to the fast electrosensory pathway evoked response. The cEOD
artifact is the small triphasic waveform highlighted in green (labeled
a–g). The fast electrosensory pathway response evoked by the
conspecific-generated EOD (green spikes) is absent at short delays (a and f)
and increases in amplitude with the interval between the self-generated EOD
and the conspecific-generated EOD (green evoked spikes labeled e, d, c and b).
Note that a similar, but smaller, decrease in the response to the
self-generated EOD is provoked by the activation of the fast electrosensory
pathway when the conspecific-generated EOD (second trace, blue spike) occurs
just before the self-generated EOD (red spike). (B) Field potential responses
evoked in the magnocellularis nucleus of a curarized fish by a two-threshold
artificial stimulus delivered at different periods (28–100 ms) after a
conditioning stimulus (evoking a response similar to that evoked by the
self-generated EOD). With short delays after the activation of the fast
electrosensory pathway responsiveness is reduced, as indicated by a decrease
in amplitude (C) and an increase in latency (D) of the response elicited by
the artificial test stimulus.
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