Results 271 to 280 of about 64,731 (311)

Androgens Alter Electric Organ Discharge Pulse Duration despite Stability in Electric Organ Discharge Frequency

Hormones and Behavior, 2001
Weakly electric fish in the genus Sternopygus emit a sinusoidal, individually distinct, and sexually dimorphic electric organ discharge (EOD) that is used in electrolocation and communication. Systemically applied androgens decrease EOD frequency, which is set by a medullary pacemaker nucleus, and increase pulse duration, which is determined by the ...
W P, Few, H H, Zakon
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Classical Conditioning of Electric Organ Discharge Rate in Mormyrids

Science, 1965
Weakly electric fish of the African family Mormyridae emit pulses at variable intervals with a distribution skewed toward longer intervals. Fourteen specimens of the genera Mormyrops , Gnathonemus , and Marcusenius were classically conditioned to increase briefly their
F J, Mandriota, R L, Thompson, M V, Bennett   +2 more
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Pathways of the electric organ discharge command and its corollary discharges in mormyrid fish

Journal of Comparative Neurology, 1983
AbstractThe motoneurons which innervate the mormyrid electric organ are driven by a descending volley from the medullary relay nucleus. This nucleus does not initiate the electric organ discharge (EOD) but is driven in an obligatory manner by another center, a command nucleus.
C C, Bell, S, Libouban, T, Szabo
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Electrical Discharges in Polar Organic Liquids

Plasma Processes and Polymers, 2009
AbstractElectrical discharges in water for pollutant degradation have been studied intensively, but there are almost no studies on electrical discharges in organic solvents. In this study, three separate experiments are conducted in relatively polar organic solvents: diamond‐like carbon (DLC) film synthesis, ammonia production, and hydrogen generation ...
Selma Mededovic Thagard, Kazunori Takashima, Akira Mizuno   +2 more
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Electric organ discharges of the gymnotiform fishes: III. Brachyhypopomus

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 1999
We measured and mapped the electric fields produced by three species of neotropical electric fish of the genus Brachyhypopomus (Gymnotiformes, Rham phichthyoidea, Hypopomidae), formerly Hypopomus. These species produce biphasic pulsed discharges from myogenic electric organs. Spatio-temporal false-color maps of the electric organ discharges measured on
P K, Stoddard, B, Rasnow, C, Assad
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Anomalous electric organ discharges from the elephant fish, Gnathonemus moori

Comparative and General Pharmacology, 1970
Abstract 1. Under the stimulating influence of caffeine, the electric organs of Gnathonemus moori generate two abnormal discharges and the normal discharge becomes depressed, possibly due to asynchronous firing of the electroplaques. 2. The first abnormal discharge that develops occurs 0·5 to 0·7 msec.
R R, Walsh, R T, Schopp
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The electric organ discharges of the gymnotiform fishes: II. Eigenmannia

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 1998
We present detailed measurements of the electric organ discharge of the weakly electric fish, Eigenmannia sp. These maps illuminate, with high resolution in both space and time, the electric organ discharge potential and electric field patterns in the water about the fish and on the skin surface itself.
C, Assad, B, Rasnow, P K, Stoddard, J M, Bower   +3 more
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Precision measurement of electric organ discharge timing from freely moving weakly electric fish

Journal of Neurophysiology, 2012
Physiological measurements from an unrestrained, untethered, and freely moving animal permit analyses of neural states correlated to naturalistic behaviors of interest. Precise and reliable remote measurements remain technically challenging due to animal movement, which perturbs the relative geometries between the animal and sensors.
James J, Jun, André, Longtin, Leonard, Maler   +2 more
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Time Domain Processing of Electric Organ Discharge Waveforms by Pulse-Type Electric Fish

Brain, Behavior and Evolution, 1986
We explored coastal streams, rivers, and swamps in the Guianas of South America and found eleven species of gymnotiform fishes with pulse discharges. Each species has a characteristic electric organ discharge (EOD) waveform of 0.5-5 ms duration; at least two species appear to have a natural sex difference in their EODs which is apparent when comparing ...
C D, Hopkins, G W, Westby
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