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Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836).
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Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Electric charge is the most fundamental quantity in an electric circuit. The effects of electric charge are encountered daily, such as when a wool sweater sticks to the human body or when a person receives a shock while walking on a carpet.
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Psychophysiological modeling: Current state and future directions.

Dominik R Bach1,2,3, Giuseppe Castegnetti1,2, Christoph W Korn1,2,4

  • 1Clinical Psychiatry Research, Department of Psychiatry, Psychotherapy, and Psychosomatics, Psychiatric Hospital, University of Zurich, Zurich, Switzerland.

Psychophysiology
|September 4, 2018
PubMed
Summary
This summary is machine-generated.

Psychophysiological modeling offers a precise, standardized method for psychologists to infer psychological states from physiological data. This approach enhances the accuracy and reliability of research across laboratories.

Keywords:
analysis/statistical methodsautonomic nervous systemcomputational modelingelectrodermal activityheart ratepupillometry

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Area of Science:

  • Psychology
  • Physiology
  • Biomedical Engineering

Background:

  • Psychologists infer psychological variables using peripheral physiological measures.
  • Standardizing this inverse inference across labs is crucial for precision.

Purpose of the Study:

  • Introduce psychophysiological modeling (PsPMs) as a solution for precise inverse inference.
  • Review PsPMs for various peripheral measures and their applications.

Main Methods:

  • PsPMs use statistical techniques to invert mathematical forward models.
  • Models are based on psychophysiological knowledge and optimized for inference precision.
  • Benchmarking involves assessing sensitivity (predictive validity) to recover known psychological variable values.

Main Results:

  • PsPMs are developed for skin conductance, heart period, respiratory measures, pupil size, and startle eyeblink.
  • Many PsPMs are task-invariant and available in open-source software.
  • These models can be readily applied to diverse experimental settings.

Conclusions:

  • Psychophysiological modeling provides a powerful, standardized methodology for inferring psychological variables.
  • This approach promises to enhance the precision and reliability of psychophysiological research.
  • Open-source availability promotes widespread adoption and standardization.