Related Experiment Video
Updated: May 10, 2026
08:08
Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
Published on: June 24, 2015
Neurons within the same network independently achieve conserved output by differentially balancing variable
Joseph L Ransdell1, Satish S Nair, David J Schulz
1Department of Biological Sciences, University of Missouri, Columbia, Missouri 65211, USA.
Summary
Neurons achieve similar outputs through different ionic conductance balances. This study demonstrates this variability in motor neurons, highlighting its importance for understanding neuronal excitability.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Ionic Conductance
Background:
- Theoretical models suggest neurons can achieve similar functional outputs by varying underlying ionic conductance magnitudes.
- Direct biological evidence for this principle, especially within the same neural network, has been limited.
Purpose of the Study:
- To provide definitive biological evidence that neurons with conserved output utilize differentially tuned ionic conductances.
- To investigate the role of conductance variability in maintaining consistent neuronal network function.
Main Methods:
- Studied multiple motor neurons from the crab (Cancer borealis) cardiac ganglion.
- Measured a 2-4 fold range of underlying ionic conductance magnitudes in neurons with highly similar outputs.
- Experimentally blocked subsets of ionic currents to observe the impact on neuronal output.
Main Results:
- Demonstrated that neurons with highly conserved output exhibit significant variability in underlying ionic conductance magnitudes.
- Showed that blocking specific currents leads to unbalanced conductances and disparate neuronal outputs.
- Confirmed that differential tuning of ionic conductances is a biological mechanism for conserved neuronal output.
Conclusions:
- Individual neurons, even within the same network, can achieve conserved outputs through distinct combinations of ionic conductances.
- Variability in neuronal excitability and conductance is a crucial factor to consider in understanding neural function.
- Future research on neuronal excitability must account for this intrinsic biological variability.
Related Concept Videos
01:25Neural Circuits
Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
01:19The Role of Ion Channels in Neuronal Computation
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
01:21Electrochemical Gradient and Channel Proteins: An Overview
An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to the...
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to the...
01:28Neuronal Communication
Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
02:47The Synapse
Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
01:15Resting Potential Decay
The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...
At rest, the K+ is the main ion that moves across the membrane through...