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Integration of Synaptic Events

Integration of Synaptic Events

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 to...

Chemical Synapses

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...

Chemical Synapses

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...

Synaptic Signaling

Synaptic Signaling

Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...

Synaptic Signaling

Synaptic Signaling

Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.

The Synapse

The 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.

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Related Experiment Video

Updated: May 25, 2026

Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond

Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond

Published on: June 24, 2015

Locally synchronized synaptic inputs.

Naoya Takahashi¹, Kazuo Kitamura, Naoki Matsuo

¹Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.

Science (New York, N.Y.)

|January 24, 2012

Summary

This summary is machine-generated.

Neurons form functional clusters on dendrites, receiving synchronized inputs. This organization aids in compartmentalizing information and influences how neurons process signals, impacting synaptic plasticity and integration.

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Area of Science:

Neuroscience
Cell Biology
Computational Neuroscience

Background:

Synaptic inputs undergo nonlinear conversion to action potentials.
Spatiotemporal patterns of dendritic activation at single-synapse resolution are not fully understood.

Purpose of the Study:

To elucidate the spatiotemporal patterns of dendritic activation at single-synapse resolution.
To investigate the functional organization of synaptic inputs on dendrites.

Main Methods:

Optical imaging of synaptic activities from hundreds of dendritic spines in rodent hippocampal and neocortical pyramidal neurons.
In vivo and ex vivo experimental approaches.

Main Results:

Adjacent dendritic spines frequently synchronized in spontaneously active networks.
Synchronized spines formed "dendritic foci" receiving locally convergent inputs from presynaptic cell assemblies.
This clustered synaptic organization was observed during N-methyl-D-aspartate receptor-dependent circuit remodeling.

Conclusions:

Clustered synaptic plasticity is inherently programmed to compartmentalize correlated inputs along dendrites.
Dendritic foci may represent a fundamental mechanism for nonlinear synaptic integration.
The subcellular geometry of synaptic inputs plays a crucial role in neural computation.