Related Experiment Video
Updated: Jan 25, 2026
07:58
Direct Visualization of the Murine Dorsal Cochlear Nucleus for Optogenetic Stimulation of the Auditory Pathway
Published on: January 20, 2015
9.7K
Near physiological spectral selectivity of cochlear optogenetics.
Alexander Dieter1,2, Carlos J Duque-Afonso1,2,3, Vladan Rankovic1,4,5
1Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37075, Göttingen, Germany.
Nature Communications
|May 1, 2019
Summary
Optogenetic stimulation offers superior spectral selectivity for hearing restoration compared to electric cochlear implants (CIs). This optical approach shows potential for improved artificial sound encoding and hearing outcomes in CI users.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Auditory Neuroscience
Background:
- Cochlear implants (CIs) partially restore hearing by electrically stimulating spiral ganglion neurons (SGNs).
- Limited spatial selectivity due to current spread in electric CIs restricts spectral resolution, impacting hearing restoration efficacy.
Purpose of the Study:
- To compare the spectral selectivity of optogenetic stimulation versus electric and acoustic stimulation.
- To evaluate the potential of optogenetics for enhanced artificial sound encoding in hearing restoration.
Main Methods:
- Multi-channel recordings were performed in the inferior colliculus (IC) of gerbils.
- Optogenetic, electric (bipolar and monopolar), and acoustic stimulation methods were employed.
- Tonotopic ordering of IC activity was analyzed in response to targeted SGN stimulation.
Main Results:
- Optogenetic stimulation of tonotopically distinct SGNs elicited corresponding tonotopically ordered IC activity.
- Spectral selectivity of optogenetic stimulation was comparable to acoustic stimulation at modest intensities.
- Optogenetic stimulation demonstrated superior spectral selectivity over electric stimulation across various intensities.
Conclusions:
- Optogenetic stimulation of SGNs offers better spectral selectivity than electric stimulation.
- Optical cochlear implants (CIs) hold promise for significantly improving hearing restoration outcomes.
Related Concept Videos
01:32What is Natural Selection?
126.5K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
126.5K
01:25Physiological Barriers
5.2K
Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types of physiological barriers: blood endothelial, cell membrane, blood-brain, blood-cerebrospinal fluid (CSF), blood-placenta, and blood-testis barriers.
The blood endothelial barrier is the most porous of these. It allows all small ionized, un-ionized, and lipophilic molecules to pass through the endothelial lining into the interstitial space...
The blood endothelial barrier is the most porous of these. It allows all small ionized, un-ionized, and lipophilic molecules to pass through the endothelial lining into the interstitial space...
5.2K
00:57Antibiotic Selection
59.6K
Overview
59.6K
01:30Liver Physiology
3.6K
The liver, an essential organ in the human body, performs over 200 vital functions that can be broadly categorized into metabolic, hematological, endocrine regulation, and bile production.
Metabolic Regulation:
The liver is the central organ involved in regulating blood composition. It stabilizes blood glucose levels, maintaining them within the range of 70–110 mg/dL. When these levels drop, the liver breaks down glycogen reserves and releases glucose into the bloodstream. It can...
Metabolic Regulation:
The liver is the central organ involved in regulating blood composition. It stabilizes blood glucose levels, maintaining them within the range of 70–110 mg/dL. When these levels drop, the liver breaks down glycogen reserves and releases glucose into the bloodstream. It can...
3.6K
01:24The Physiology of Taste
7.3K
The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
7.3K
01:20Physiology of Emotion
3.3K
The physiology of emotions is a multifaceted process involving the autonomic nervous system, brain structures, hormones, and neurotransmitters. This intricate interplay dictates how emotions manifest in the body and influence behavior.
Autonomic Nervous System
The autonomic nervous system (ANS) plays a critical role in emotional responses by regulating involuntary physiological functions. It consists of two main components: the sympathetic and parasympathetic systems. The sympathetic system...
Autonomic Nervous System
The autonomic nervous system (ANS) plays a critical role in emotional responses by regulating involuntary physiological functions. It consists of two main components: the sympathetic and parasympathetic systems. The sympathetic system...
3.3K