Convergent designs for electrogenesis and electroreception
1Section of Neurobiology and Behavior, Cornell University, Ithaca, New York 14853, USA. CDH8@cornell.edu
Current Opinion in Neurobiology
|December 1, 1995
Summary
Electric signal generation and recognition evolved independently in New- and Old-World tropical electric fish, as they lack a common electrical ancestor. Research focuses on convergent evolution in electrogenesis and electroreception mechanisms.
Area of Science:
- Neuroscience
- Evolutionary Biology
- Bioelectricity
Background:
- Tropical electric fish in the New World and Old World exhibit complex electric signaling.
- These fish lack a shared evolutionary origin for their electrical capabilities.
Purpose of the Study:
- To investigate the independent evolution of electrogenesis and electroreception in disparate electric fish lineages.
- To understand the convergent mechanisms underlying electric signal generation and recognition.
Main Methods:
- Comparative analysis of electric organ structures.
- Examination of neural circuitry controlling electric organ pacemakers.
- Investigation of neural pathways for electric waveform time coding.
Main Results:
- Evidence suggests independent evolutionary origins for electric signaling in New- and Old-World tropical fish.
- Convergent designs are observed in electrogenesis and electroreception mechanisms.
- Specific neural circuits for signal generation and temporal coding show independent adaptation.
Conclusions:
- The capacity for electric signaling in fish has evolved multiple times independently.
- Convergent evolution has shaped similar functional solutions for electrogenesis and electroreception in unrelated species.
- Understanding these independent pathways provides insight into evolutionary processes and neural adaptation.
Related Concept Videos
01:54Convergent Evolution
33.1K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
33.1K
01:17Region of Convergence
965
The z-transform is a powerful mathematical tool used in the analysis of discrete-time signals and systems. It is a crucial tool in the analysis of discrete-time systems, but its convergence is limited to specific values of the complex variable z. This range of values, known as the Region of Convergence (ROC), is fundamental in determining the behavior and stability of a system or signal. The ROC defines the region in the complex plane where the z-transform converges, which can take various...
965
01:21Convergence of Fourier Series
437
The Fourier series is a powerful mathematical tool for representing periodic signals as an infinite sum of complex exponentials. In practice, this infinite series is truncated to a finite number of terms, yielding a partial sum. This truncation makes the approximation of the signal feasible but introduces certain challenges, particularly near discontinuities, known as the Gibbs phenomenon.
The Gibbs phenomenon refers to the persistent oscillations and overshoots that occur near discontinuities...
The Gibbs phenomenon refers to the persistent oscillations and overshoots that occur near discontinuities...
437
02:01Group Design
10.7K
The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
10.7K
01:20Region of Convergence of Laplace Tarnsform
1.3K
The Region of Convergence (ROC) is a fundamental concept in signal processing and system analysis, particularly associated with the Laplace transform. The ROC represents an area in the complex plane where the Laplace transform of a given signal converges, determining the transform's applicability and utility.
Consider a decaying exponential signal that begins at a specific time. When deriving its Laplace transform, the time-domain variable is replaced with a complex variable. This...
Consider a decaying exponential signal that begins at a specific time. When deriving its Laplace transform, the time-domain variable is replaced with a complex variable. This...
1.3K
02:01Factorial Design
14.1K
Factorial Analysis is an experimental design that applies Analysis of Variance (ANOVA) statistical procedures to examine a change in a dependent variable due to more than one independent variable, also known as factors. Changes in worker productivity can be reasoned, for example, to be influenced by salary and other conditions, such as skill level. One way to test this hypothesis is by categorizing salary into three levels (low, moderate, and high) and skills sets into two levels (entry level...
14.1K