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Related Concept Videos

Sound Intensity Level00:53

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...
Sound Intensity00:58

Sound Intensity

The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the emitted...
Intensity and Pressure of Sound Waves01:05

Intensity and Pressure of Sound Waves

The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
Unlike the time average of a sinusoidal term, which is zero since it is positive and...
Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
Thermosensation01:43

Thermosensation

Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
Intensity Of Electromagnetic Waves01:22

Intensity Of Electromagnetic Waves

The energy transport per unit area per unit time, or the Poynting vector, gives the energy flux of an electromagnetic wave at any specific time. For a plane electromagnetic wave with E0 and B0 as the peak electric and magnetic fields and traveling along the x-axis, the time-varying energy flux can be given by the following equation:

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Using the Race Model Inequality to Quantify Behavioral Multisensory Integration Effects
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Is the insula the "how much" intensity coder?

Massieh Moayedi1, Irit Weissman-Fogel

  • 1Institute of Medical Science, University of Toronto, 610 University Ave., Toronto, ON, Canada M5G 2M9. mmoayedi@uhnres.utoronto.ca

Journal of Neurophysiology
|July 3, 2009
PubMed
Summary
This summary is machine-generated.

The insula may act as a central brain region for estimating the intensity of various sensations, including pain. This research explores its role in calibrating behavior across different sensory inputs.

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Pain Research

Background:

  • Sensation perception involves magnitude estimation for behavioral calibration.
  • The existence of modality-specific or centralized intensity coding mechanisms remains unclear.

Purpose of the Study:

  • To discuss findings on pain intensity coding.
  • To evaluate the insula's role as a multimodal magnitude estimator, referencing Baliki et al.

Main Methods:

  • Literature review and discussion of existing research findings.
  • Analysis of neuroimaging and psychophysical data related to pain perception and insula function.

Main Results:

  • The insula is implicated in processing pain intensity.
  • Evidence suggests the insula may integrate information across different sensory modalities for magnitude estimation.

Conclusions:

  • The insula is a potential candidate for a centralized magnitude estimator for sensations.
  • Further research is needed to confirm the insula's multimodal role in sensory perception and behavioral calibration.