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Related Concept Videos

Long-term Potentiation01:25

Long-term Potentiation

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
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Long-term Potentiation01:35

Long-term Potentiation

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Postsynaptic Potential (PSP)01:32

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Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
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Propagation of Action Potentials01:23

Propagation of Action Potentials

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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...
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Graded Potential01:19

Graded Potential

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Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
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Updated: Jan 16, 2026

Long-term Potentiation of Perforant Pathway-dentate Gyrus Synapse in Freely Behaving Mice
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Gain modulation of probabilistic selection without synaptic relearning.

Elif Köksal-Ersöz1,2, Pascal Chossat3,4, Frédéric Lavigne3,5

  • 1Inria, Villeurbanne, France.

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|September 30, 2025
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Summary
This summary is machine-generated.

This study introduces a neural mechanism called gain modulation for rapid goal adjustment in response to punishment. This non-synaptic learning complements synaptic plasticity, helping brains avoid harmful choices without relearning.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Behavioral Neuroscience

Background:

  • Behavioral adaptation relies on the brain's ability to adjust goals in dynamic environments.
  • Synaptic learning modifies action selection probabilities based on outcomes, crucial for avoiding negative consequences.

Purpose of the Study:

  • To propose a neural mechanism for immediate goal probability changes following punishment.
  • To investigate how gain modulation influences navigation within neuronal networks after punishment.

Main Methods:

  • Modeling a neural network of excitatory and inhibitory neuronal populations.
  • Simulating a gain modulation mechanism to alter goal selection probabilities.
  • Analyzing navigation patterns within the network's state space post-punishment.

Main Results:

  • Gain modulation enables immediate avoidance of punished pathways by shifting goal selection.
  • The mechanism operates via modulating gain in active units at the time of punishment, not synaptic efficacy.
  • This non-synaptic learning allows rapid behavioral changes without statistical relearning.

Conclusions:

  • Gain modulation offers a complementary non-synaptic learning pathway to synaptic plasticity for behavioral adaptation.
  • This mechanism facilitates efficient avoidance of detrimental actions, enhancing survival and learning.
  • The model demonstrates how neural gain modulation can encode experiential memories to guide behavior.