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Related Concept Videos

Reaction Rate02:53

Reaction Rate

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The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
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Related Rates01:18

Related Rates

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When two or more physical quantities are linked by a single relationship, a change in one variable necessarily affects the others. This interdependence forms the basis of related rates analysis, which examines how different quantities change with respect to time. A classic physical example is an expanding balloon, where the size of the balloon changes continuously as air is added.For a hot air balloon, the inflated envelope is commonly idealized as a perfect sphere to simplify mathematical...
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Speciation Rates01:07

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Measuring Reaction Rates03:09

Measuring Reaction Rates

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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Rate-Determining Steps03:08

Rate-Determining Steps

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
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Concentration and Rate Law03:03

Concentration and Rate Law

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The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions describing the relationship between the rate of a chemical reaction and the concentration of its reactants.
For example, in a generic reaction aA + bB ⟶ products, where a and b are stoichiometric coefficients, the rate law can be written as:
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Related Experiment Video

Updated: Feb 13, 2026

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process

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Rate modulation detection thresholds for cochlear implant users.

Tim Brochier1, Colette McKay2, Hugh McDermott2

  • 1Department of Medical Bionics, University of Melbourne, 384-388 Albert Street, East Melbourne, Victoria 3002, Australia.

The Journal of the Acoustical Society of America
|March 3, 2018
PubMed
Summary

Cochlear implant users

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Area of Science:

  • Auditory Neuroscience
  • Speech Perception
  • Cochlear Implant Technology

Background:

  • Temporal amplitude modulation perception is crucial for speech understanding in cochlear implant (CI) users.
  • Understanding how CI users perceive different modulation types is key to improving speech intelligibility.

Purpose of the Study:

  • To compare the detection abilities of CI users for electrical stimulation rate modulations versus current level amplitude modulations.
  • To investigate the influence of presentation level and modulation frequency on these detection thresholds.

Main Methods:

  • Measured rate modulation detection thresholds (RMDTs) and amplitude modulation detection thresholds (AMDTs) in CI users.
  • Tested at two presentation levels (80% and 40% of dynamic range) and two modulation frequencies (10 Hz and 100 Hz).

Main Results:

  • Both RMDTs and AMDTs improved with higher presentation levels and lower modulation frequencies.
  • RMDTs and AMDTs were significantly correlated across participants.

Conclusions:

  • CI users' perception of rate and amplitude modulation is influenced by presentation level and modulation frequency.
  • The correlation between RMDTs and AMDTs suggests shared neural processing mechanisms or common individual factors influencing both perception types.