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Published on: August 18, 2020
Modelling neural informational propagation and functional auditory sensory memory with temporal multi-scale
Maja Serman1, Nikola Serman, Niall J L Griffith
1Laboratoire de Neurophysiologie, Université Victor Segalen - Bordeaux 2, UMR CNRS 5543, BP 63, 146 rue Leo Saignat, F-33076, Bordeaux Cedex, France. maja.serman@u-bordeaux2.fr
Journal of Computational Neuroscience
|January 4, 2007
Summary
Both diffusion and leaky integrator cascade models reveal temporal multi-scaling in auditory information processing. These causal models offer insights into auditory sensory memory formation and dynamics.
Area of Science:
- Neuroscience
- Computational Auditory Processing
- Signal Processing
Background:
- Auditory sensory memory is crucial for understanding complex sounds.
- Temporal multi-scale analysis is key to auditory perception.
- Existing models often use convolution, not causal physical processes.
Purpose of the Study:
- To investigate temporal multi-scaling in information transport mechanisms.
- To model auditory sensory memory using causal physical processes.
- To compare the biological plausibility of diffusion (CD) and leaky integrator cascade (LINC) models for auditory memory.
Main Methods:
- Modeled information transport as causal physical processes, not convolution algorithms.
- Developed and analyzed the causal diffusion (CD) operator.
- Developed and analyzed the leaky integrator cascade (LINC) operator.
Main Results:
- Both CD and LINC models inherently exhibit temporal multi-scaling.
- Temporal multi-scale representations from both models mimic auditory sensory memory effects like filtering, time delay, and binding.
- The LINC operator demonstrates higher biological plausibility for modeling temporal cortical processing and functions like change detection.
Conclusions:
- Temporal multi-scaling is an inherent property of diffusion and LINC transport mechanisms.
- These causal models provide a framework for understanding auditory sensory memory.
- The LINC model offers a more biologically plausible explanation for higher-level auditory sensory memory functions in the cortex.
Related Concept Videos
01:15Auditory 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...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
01:31Hearing
When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
01:13The 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.
01:23Propagation of Action Potentials
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...
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...
01:22Hair Cells
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
01:21Perceiving Loudness, Pitch, and Location
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...