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Journal of Neuroscience, Vol 10, 1241-1253, Copyright © 1990 by Society for Neuroscience
Descending control of electroreception. II. Properties of nucleus praeeminentialis neurons projecting directly to the electrosensory lateral line lobe
B Bratton and J Bastian
Department of Zoology, University of Oklahoma, Norman 73019.
The nucleus praeeminentialis projects to the electrosensory lateral line
lobe via 2 distinct pathways. Neurons that project to the posterior
eminentia granularis and therefore influence the electrosensory lateral
line lobe indirectly are described in the preceding report. This report
describes the physiological properties and anatomical characteristics,
revealed with Lucifer yellow staining, of n. praeeminentialis neurons that
project directly to the ventral molecular layer of the electrosensory
lateral line lobe. The neurons studied were the stellate cells described by
Sas and Maler (1983), and we found 2 physiological subtypes of these. These
neurons typically had no spontaneous activity, but responded vigorously to
either increased electric organ discharge amplitude on the contralateral
side of the body (ST-E cells) or to decreased amplitude (ST-I cells). These
neurons also responded to low-frequency sinusoidal electric organ discharge
amplitude modulations (AM) but were inhibited by AMs having frequencies
greater than about 16 Hz. These stellate neurons were unable to encode
information about long-term changes in electric organ discharge amplitude,
but they responded very well to moving electrolocation targets. The
relatively long response latency of these neurons suggests that they
receive inputs from higher centers in addition to those from the
electrosensory lateral line lobe. It is suggested that these cells alter
the sensitivity of restricted populations of output cells in the
electrosensory lateral line lobe and process temporally and spatially
restricted stimuli. They may act to increase the intensity of the neural
representation of important stimuli.
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