Related Experiment Video
Updated: Jun 28, 2026
07:33
Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
Published on: June 29, 2018
Modulation of synchrony without changes in firing rates
Jakob Heinzle1, Peter König, Rodrigo F Salazar
1Institute of Neuroinformatics, University & ETH Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland, jakob@ini.phys.ethz.ch.
Cognitive Neurodynamics
|November 13, 2008
Summary
Neuronal synchronization can be modulated independently of firing rate by adjusting synaptic weights. This finding suggests distinct coding dimensions for neural information processing.
Area of Science:
- Computational Neuroscience
- Systems Neuroscience
Background:
- Spike synchronization is a proposed neural coding mechanism.
- Theoretical validation of independent modulation of synchrony and firing rate is limited.
Purpose of the Study:
- To investigate if synaptic weight changes can independently modulate neuronal synchrony without altering firing rate.
- To explore this mechanism in both single neurons and neuronal populations.
Main Methods:
- Network simulations using conductance-based integrate-and-fire neurons.
- A single-layer network with local and long-range excitatory/inhibitory connections.
- External uncorrelated Poisson spike trains as input.
Main Results:
- Increased external input linearly increased network activity and oscillation frequency.
- Balanced changes in excitatory synaptic weights modulated synchrony independently of firing rate.
- Demonstrated independent modulation in a simulated neural network.
Conclusions:
- Neuronal synchrony and firing rate can be independently modulated.
- These distinct coding dimensions may be utilized for neural information processing.
Related Concept Videos
01:22Muscle Stimulation Frequency
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
01:23Propagation of Action Potentials
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
01:20Motor Unit Stimulation
When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...