Gain control in the electrosensory system: a role for the descending projections to the electrosensory lateral line lobe

1986 ◽  
Vol 158 (4) ◽  
pp. 505-515 ◽  
Author(s):  
Joseph Bastian
Keyword(s):  
Lateral Line ◽  
Gain Control ◽  
Electrosensory System ◽  
System A ◽  
Descending Projections

The Ampullary Electrosensory System – A Paddlefish Case Study

2020 ◽  
pp. 215-227
Author(s):  
Boris P. Chagnaud ◽  
Lon A. Wilkens ◽  
Michael Hofmann
Keyword(s):  
Electrosensory System ◽  
System A

Adaptive Neural Network L2-Gain Control for Unmodeled Dynamics Nonlinear System

2009 ◽  
Vol 419-420 ◽  
pp. 561-564
Author(s):  
Ge Si Wang ◽  
Zhi Gang Yu ◽  
Shen Min Song
Keyword(s):  
Neural Network ◽  
Nonlinear System ◽  
Performance Indicators ◽  
Gain Control ◽  
Unmodeled Dynamics ◽  
Closed Loop System ◽  
Adaptive Neural Network ◽  
System A ◽  
Control Scheme ◽  
Finite Gain

A new control scheme is proposed for the nonlinear system with unmodeled dynamics based on HJI and adaptive neural network L2-gain controller. The aim is to make the closed-loop system a finite gain L2 stable between the disturbance and output of the system. The approach will avoid the limit of precise modelling, only need the unmodeled dynamics to be bounded without the other transcendent information. The simulation results show that the control system designed can satisfy the performance indicators proposed.

Transient integumentary structures in Boana riojana (Anura, Hylidae) tadpoles

2019 ◽  
Vol 40 (4) ◽  
pp. 543-549 ◽  
Author(s):  
Silvia Inés Quinzio ◽  
Javier Goldberg
Keyword(s):  
Lateral Line ◽  
Lateral Line System ◽  
Ciliated Cells ◽  
Oral Disc ◽  
Line System ◽  
System A ◽  
New Information ◽  
Lateral Lines ◽  
Skin Morphology ◽  
Tadpole Skin

Abstract Few studies focusing on embryos and/or tadpole skin morphology have described sensory transient organs whose morphological variation could indicate some taxonomical or functional correlations. We explore here some integumentary features of Boana riojana larvae that are rarely mentioned in tadpole descriptions. We provide histomorphological and SEM descriptions of the lateral line system, a series of evenly distributed unpigmented spots, and some symmetrical paired structures dorsal to the oral disc. The latter are previously unreported in any tadpole. Our descriptions reveal that the: 1) the number of lateral lines resembles those for most tadpoles, but with an unusual arrangement of stitches; 2) paired lateral spots are formed by ciliated cells dispersed in clusters unrelated to the lateral line system; and 3) upper-lip related structures are histomorphologically similar to the unpigmented spots. We discuss and suggest that integumentary transient structures in B. riojana represent traits that should be taken into account when describing tadpoles. This new information may help diagnose species and advance our understanding of tadpole ecomorphology and evolution.

Lateral line stimuli can override vision to determine sunfish strike trajectory

1993 ◽  
Vol 176 (1) ◽  
pp. 299-305 ◽  
Author(s):  
J Janssen ◽  
J Corcoran
Keyword(s):  
Water Flow ◽  
Lateral Line ◽  
Active Species ◽  
Unconditioned Response ◽  
Lateral Line System ◽  
Line System ◽  
System A

Although all fishes have a mechanosensory lateral line system — a system of water flow detectors (neuromasts) in canals or free on the skin’s surface — particular behavioral functions are documented for only a few species. Work on lateral line use for feeding has focused on either cavefishes or night-active species (Montgomery, 1989). While surface-feeding fishes with well-developed eyes do use the lateral line to locate prey (Müller and Schwartz, 1982), it is generally assumed that diurnal/crepuscular fishes are visual predators. We show that a hydromechanical stimulus detected by the cephalic lateral line system in two sunfishes (Centrarchidae) can be the sole determinant of a strike trajectory. The response occurs without reinforcement and appears to be an unconditioned response.

A description of two new species of the genus Gobio from Central Anatolia (Turkey) (Teleostei: Cyprinidae)

2006 ◽  
Vol 15 (1) ◽  
pp. 185-194
Author(s):  
A.M. Naseka ◽  
F. Erk'akan ◽  
F. Küçük
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Aegean Sea ◽  
Zoological Institute ◽  
Central Anatolia ◽  
Colour Pattern ◽  
Lower Lip ◽  
System A ◽  
Two New Species ◽  
Endorheic Basin

The gudgeons of the genus Gobio from Anatolia are reviewed based upon the historical collection of the Hamburg Zoological Institute and Museum, Hamburg University, and recently collected materials. Fishes previously referred to subspecies of Gobio gobio be¬long to at least 8 species. Among them, two new species are described: G. battalgilae from northern Beyşehir Lake system (a Central Anatolian endorheic basin) and G. maeandricus from the headwaters of Great Menderes River (Aegean Sea basin). These spe¬cies are distinguished by a combination of the number of lateral line scales, predorsal and circumpeduncular scale counts, scale pattern on belly, vertebral counts, length of barbel shape of lower lip, and details of colour pattern.

Video-Enhanced Microscopy--Better Visibility of Plant Cell Structures

1982 ◽  
Vol 40 ◽  
pp. 182-185
Author(s):  
N.S. Allen ◽  
R.D. Allen
Keyword(s):  
Diffraction Pattern ◽  
Theoretical Basis ◽  
Numerical Aperture ◽  
Gain Control ◽  
Control Unit ◽  
Camera Control ◽  
Variable Gain ◽  
Contrast Method ◽  
Fine Detail ◽  
Cell Structures

Various methods of video-enhanced microscopy combine TV cameras with light microscopes creating images with improved resolution, contrast and visibility of fine detail, which can be recorded rapidly and relatively inexpensively. The AVEC (Allen Video-enhanced Contrast) method avoids polarizing rectifiers, since the microscope is operated at retardations of λ/9- λ/4, where no anomaly is seen in the Airy diffraction pattern. The iris diaphram is opened fully to match the numerical aperture of the condenser to that of the objective. Under these conditions, no image can be realized either by eye or photographically. Yet the image becomes visible using the Hamamatsu C-1000-01 binary camera, if the camera control unit is equipped with variable gain control and an offset knob (which sets a clamp voltage of a D.C. restoration circuit). The theoretical basis for these improvements has been described.

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