Abstract
The two closely related gymnotiform fishes, Apteronotus and Eigenmannia, share many similar communication and electrolocation behaviors that require modulation of the frequency of their electric organ discharges. The premotor linkages between their electrosensory system and their medullary pacemaker nucleus, which controls the repetition rate of their electric organ discharges, appear to function differently, however. In the context of the jamming avoidance response, Eigenmannia can raise or lower its electric organ discharge frequency from its resting level. A normally quiescent input from the diencephalic prepacemaker nucleus can be recruited to raise the electric organ discharge frequency above the resting level. Another normally active input, from the sublemniscal prepacemaker nucleus, can be inhibited to lower the electric organ discharge frequency below the resting level (Metzner 1993). In contrast, during a jamming avoidance response, Apteronotus cannot lower its electric organ discharge frequency below the resting level. The sublemniscal prepacemaker is normally completely inhibited and release of this inhibition allows the electric organ discharge frequency to rise during the jamming avoidance response. Further inhibition of this nucleus cannot lower the electric organ discharge frequency below the resting level. Lesions of the diencephalic prepacemaker do not affect performance of the jamming avoidance response. Thus, in Apteronotus, the sublemniscal prepacemaker alone controls the change of the electric organ discharge frequency during the jamming avoidance response.
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Abbreviations
- aCSF :
-
artificial cerebrospinal fluid
- APV :
-
d(-)2-amino-5-phosphonovaleric acid (NMDA receptor blocker)
- CNQX :
-
6-cyano-7-nitroquinoxaline-2,3-dione (non-NMDA receptor blocker)
- CPP :
-
3-(2-carboxypiperazine-4-yl)-propyl-1 -phosphonic acid (NMDA receptor blocker)
- Df :
-
frequency difference between jamming signal and EOD
- EOD :
-
electric organ discharge
- f eod :
-
frequency of fish's own EOD
- f jam :
-
frequency of jamming stimulus
- GABA :
-
γ-amino-n -butyric acid
- JAR :
-
jamming avoidance response
- NMDA :
-
N-methyl-d-aspartate
- NSR :
-
non-selective response
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This work is based on a manuscript that was partially completed at the time of Dr. Heiligenberg's untimely death on September 8, 1994
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Heiligenberg, W., Wong, C.J.H., Metzner, W. et al. Motor control of the jamming avoidance response of Apteronotus leptorhynchus: evolutionary changes of a behavior and its neuronal substrates. J Comp Physiol A 179, 653–674 (1996). https://doi.org/10.1007/BF00216130
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DOI: https://doi.org/10.1007/BF00216130