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The Cochlea

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

Neuroplasticity

Neuroplasticity

Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.

Auditory Pathway

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

Long-term Potentiation

Long-term Potentiation

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
LTP can occur when presynaptic neurons...

Long-term Potentiation

Long-term Potentiation

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.

Plasticity

Plasticity

Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...

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Modeling the primary auditory cortex using dynamic synapses: can synaptic plasticity explain the temporal tuning?

Sohrab Saeb¹, Shahriar Gharibzadeh, Farzad Towhidkhah

¹Cognitive Neural Engineering Lab, Faculty of Biomedical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.

Journal of Theoretical Biology

|June 15, 2007

Summary

Behavioral learning enhances auditory cortex responses by altering synaptic facilitation. This study proposes that calcium influx variations at nerve terminals drive this temporal tuning, a key finding for understanding neural plasticity.

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Published on: October 11, 2017

Area of Science:

Neuroscience
Computational Neuroscience
Auditory System Research

Background:

The mechanisms behind temporal plasticity in cortical cells are not fully understood.
Behavioral learning demonstrably influences neuronal responses in the primary auditory cortex.

Purpose of the Study:

To investigate the origins of temporal plasticity in the primary auditory cortex using a computational model.
To explore the role of synaptic dynamics in auditory learning-related neural changes.

Main Methods:

Development of a minimal feed-forward model of the primary auditory cortex.
Incorporation of dynamic synapse and leaky integrate-and-fire neuron models.
Analysis of how synaptic facilitation (U(1)) affects the model's frequency response.

Main Results:

Model frequency response significantly changes with adjustable synaptic facilitation.
Synaptic facilitation's contribution is linked to calcium (Ca2+) influx at nerve terminals.
This calcium influx variation is proposed as the source of temporal tuning.

Conclusions:

Synaptic facilitation, modulated by calcium influx, is a likely mechanism for auditory cortex temporal tuning.
Variations in this parameter may explain auditory cortex enhancement due to behavioral training.
Further research should measure long-term calcium influx variations during auditory learning to validate this hypothesis.