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Related Concept Videos

Synaptic Signaling01:09

Synaptic Signaling

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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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Chemical Synapses01:26

Chemical Synapses

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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...
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The Synapse02:47

The Synapse

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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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Excitatory and Inhibitory Effects of Neurotransmitters01:29

Excitatory and Inhibitory Effects of Neurotransmitters

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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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Neurochemical Transmission: Sites of Drug Action01:26

Neurochemical Transmission: Sites of Drug Action

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Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...
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Drugs Affecting Neurotransmitter Synthesis01:29

Drugs Affecting Neurotransmitter Synthesis

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Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase,...
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Related Experiment Video

Updated: Sep 12, 2025

Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs
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Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs

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Synaptic sign switching mediates online dopamine updates.

Shun Li, Wengang Wang, Grace Knipe

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    |August 8, 2025
    PubMed
    Summary

    Biological learning involves changing synaptic weights, not signs. This study shows experience can switch synaptic signs in the brain, impacting dopamine signaling and reinforcement learning.

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    Area of Science:

    • Neuroscience
    • Synaptic Plasticity
    • Reinforcement Learning

    Background:

    • Biological neural networks traditionally exhibit fixed synaptic signs (excitatory or inhibitory).
    • Learning in the brain is primarily attributed to modifications in synaptic weight, not sign.
    • Distinct synaptic populations mediate excitation and inhibition, unlike artificial networks.

    Purpose of the Study:

    • To investigate experience-dependent synaptic plasticity in the mammalian brain.
    • To determine if synaptic signs can be altered by experience.
    • To explore the role of synaptic sign switching in reinforcement learning and dopaminergic signaling.

    Main Methods:

    • Electrophysiological recordings in the mammalian brain.
    • Stimulation of glutamate and GABA co-releasing neurons in the entopedunculus (EP).
    • Pairing neuronal activation with reward or punishment stimuli.

    Main Results:

    • Demonstrated experience-dependent sign switching at EP-LHb synapses.
    • Showed that reward pairing increases inhibition, while punishment pairing increases excitation.
    • Observed that synaptic sign switching modulates dopaminergic signaling and correlates with dopamine updates.

    Conclusions:

    • Synaptic sign switching is a novel plasticity mechanism in the mammalian brain.
    • This mechanism allows for rapid updates in synaptic function and contributes to reinforcement learning.
    • Altering both synaptic signs and weights enables dynamic adaptation of neural circuits.