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Related Concept Videos

Integration of Synaptic Events01:28

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...
Synaptic Signaling01:09

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...
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Neural Circuits01:25

Neural 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.
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The Role of Ion Channels in Neuronal Computation01:19

The 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.
Neuronal Communication01:28

Neuronal 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...

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Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology
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Interregional synaptic competition in neurons with multiple STDP-inducing signals.

Lital Bar Ilan1, Albert Gidon, Idan Segev

  • 1Institute of Life Sciences, Department of Neurobiology, The Hebrew University, Jerusalem, Israel.

Journal of Neurophysiology
|December 3, 2010
PubMed
Summary

Neocortical pyramidal cells have two spike initiation zones, leading to competition between synapses. The back-propagating action potential (BPAP) balances synaptic efficacies, maintaining neuronal function.

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Cellular Electrophysiology

Background:

  • Neocortical layer 5 (L5) pyramidal cells possess distinct spike initiation zones for Na(+) and Ca(2+) spikes.
  • These spikes interact and are crucial for synaptic plasticity, a mechanism underlying learning and memory.

Purpose of the Study:

  • To investigate the implications of dual spike initiation zones on synaptic plasticity in L5 pyramidal neurons.
  • To explore the emergent competition between synapses associated with different spike initiation zones.

Main Methods:

  • Utilized a detailed computational model of an L5 pyramidal neuron.
  • Simulated spike-timing-dependent plasticity (STDP) with distinct regional synaptic populations.
  • Analyzed interregional synaptic competition and the role of back-propagating action potentials (BPAPs).

Main Results:

  • A novel form of interregional synaptic competition was observed, where one synaptic group strengthens at the expense of others.
  • This competition is inherent to dendritic structures with multiple Hebbian plasticity signaling regions.
  • Interregional competition was also found in simplified two-compartment models.

Conclusions:

  • The back-propagating action potential (BPAP) plays a critical role in regulating Ca(2+) spike induction.
  • BPAPs help maintain a balance between synaptic efficacies across the dendritic tree.
  • This balance is essential for sustaining the overall functional integrity of L5 pyramidal neurons.