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Fig. 1. (A) Sagittal schematic showing the functional neuroanatomy of the mormyrid
electromotor system, based on Bell et al.
(1983), Carlson
(2002b,
2003) and von der Emde et al.
(2000). Excitatory terminals
are identified by flat lines, inhibitory terminals by solid circles. Red
denotes medullary electromotor nuclei, blue denotes mesencephalic and
diencephalic electromotor nuclei (topic of the current study), and green
denotes corollary discharge nuclei. BCA, bulbar command-associated nucleus;
C3, third cerebellar lobule; CN, command nucleus; DP, dorsal posterior nucleus
of the thalamus; EGp, eminentia granularis pars posterior; EL, exterolateral
nucleus of the torus semicircularis; ELL, electrosensory lateral line lobe;
EMN, electromotor neurons; IL, inferior lobe of the hypothalamus; MCA,
mesencephalic command-associated nucleus; MRN, medullary relay nucleus; OB,
olfactory bulb; PCN, precommand nucleus; Tel, telencephalon; TM, tectum
mesencephali; Val, valvula of the cerebellum; VPd, dorsal subdivision of the
ventroposterior nucleus of the torus semicircularis. (B) Examples of the three
burst display types produced by freely behaving Brienomyrus
brachyistius. Quantitative analysis indicates that they fall into
distinct categories based on unique temporal patterns of EOD production
(Carlson and Hopkins, unpublished observations).
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