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Related Concept Videos

Graded Potential01:19

Graded Potential

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Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
Graded potentials fall into two categories: depolarizing and hyperpolarizing. Depolarizing graded potentials typically occur when sodium (Na+) or...
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Related Experiment Video

Updated: May 6, 2026

Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies
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Event-related potential measures of a violation of an expected increase and decrease in intensity.

Margaret Macdonald1, Kenneth Campbell

  • 1School of Psychology, University of Ottawa, Ottawa, Ontario, Canada.

Plos One
|October 22, 2013
PubMed
Summary
This summary is machine-generated.

Auditory intensity changes are perceived as obtrusive due to physical or psychological shifts. This study found that violations of auditory expectancy, regardless of physical intensity change, elicit a larger mismatch negativity (MMN).

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Area of Science:

  • Auditory perception
  • Neuroscience
  • Psychology

Background:

  • Unexpected auditory stimuli can be intrusive due to physical intensity changes or violated expectations.
  • The brain processes auditory changes differently based on physical intensity versus expectancy violations.

Purpose of the Study:

  • To investigate if psychological increments (violating an expectancy for lower intensity) are processed differently than psychological decrements (violating an expectancy for higher intensity).
  • To determine the neural correlates of expectancy violation in auditory processing using event-related potentials (ERPs).

Main Methods:

  • Two experiments were conducted using auditory oddball paradigms with alternating low and high intensity tones.
  • Event-related potentials (ERPs) were recorded while participants passively listened to stimuli.
  • Deviants were created by repeating the standard stimulus, resulting in either a psychological increment or decrement.

Main Results:

  • Psychological increments, where a higher intensity tone was expected but a lower one occurred, elicited a significantly larger mismatch negativity (MMN) amplitude compared to psychological decrements.
  • The physical intensity of the deviant stimulus was identical in both increment and decrement conditions, isolating the effect of expectancy violation.

Conclusions:

  • The mismatch negativity (MMN) response is sensitive to the violation of auditory expectancies, irrespective of whether the physical stimulus intensity increases or decreases.
  • This suggests that the brain's predictive coding mechanisms play a crucial role in processing auditory deviations.