Related Experiment Video
Updated: May 29, 2025
08:08
Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
Published on: June 24, 2015
11.4K
Dendritic excitations govern back-propagation via a spike-rate accelerometer
Pojeong Park1,2, J David Wong-Campos1, Daniel G Itkis1
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.
Nature Communications
|February 5, 2025
Summary
Neurons
Area of Science:
- Neuroscience
- Computational Neuroscience
- Electrophysiology
Background:
- Dendrites play a crucial role in neuronal electrical activity, but their computational functions remain unclear.
- Understanding dendritic processing is key to deciphering complex neural computations.
Purpose of the Study:
- To investigate the computational significance of dendritic electrical events using novel all-optical electrophysiology tools.
- To map sub-millisecond voltage dynamics in CA1 pyramidal neuron dendrites.
Main Methods:
- Development of integrated molecular, optical, and computational tools for all-optical electrophysiology.
- Recording dendritic voltage dynamics in acute brain slices under various stimulation patterns.
- Analysis of ion channel contributions (Na+, K+, Ca2+) and receptor involvement (NMDAR).
Main Results:
- Demonstrated history-dependent spike back-propagation in distal dendrites, mediated by local sodium spikes (dSpikes).
- Identified a transient window for dSpike propagation regulated by A-type K_V and slow Na_V channel inactivation.
- Showcased dSpike-synaptic input interactions triggering calcium and NMDAR-dependent dendritic plateau potentials and somatic complex spikes.
Conclusions:
- The dendritic ion channel network functions as a spike-rate accelerometer, linking dendritic biophysics to associative plasticity.
- This mechanism provides a novel framework for understanding how dendritic computations influence neuronal output and learning.
More Related Videos
12:51Voltage-sensitive Dye Recording from Axons, Dendrites and Dendritic Spines of Individual Neurons in Brain Slices
Published on: November 29, 2012
16.7K
07:34A Simple Stimulatory Device for Evoking Point-like Tactile Stimuli: A Searchlight for LFP to Spike Transitions
Published on: March 25, 2014
9.8K
Related Concept Videos
01:19The Role of Ion Channels in Neuronal Computation
3.1K
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....
3.1K
01:31Action Potential
7.7K
Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they...
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they...
7.7K
01:23Propagation of Action Potentials
5.1K
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...
5.1K
01:28Integration of Synaptic Events
1.4K
Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability...
1.4K