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Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
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Effects of a violation of an expected increase or decrease in intensity on detection of change within an auditory

Margaret Macdonald1, Kenneth Campbell

  • 1School of Psychology, University of Ottawa, Ottawa, Canada K1N 6N5.

Brain and Cognition
|September 20, 2011
PubMed
Summary
This summary is machine-generated.

Auditory processing differs for psychological increments versus decrements. A larger, earlier Mismatch Negativity (MMN) brainwave response was observed for increments, even when transient detection systems were controlled.

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Area of Science:

  • Auditory Neuroscience
  • Cognitive Psychology
  • Human Brain Activity

Background:

  • Auditory perception distinguishes between physical intensity increases and decreases.
  • Physical increments activate transient and change detector systems, while decrements activate only change detectors.
  • Previous research suggests distinct neural processing for auditory increments and decrements.

Purpose of the Study:

  • To investigate if psychological intensity increments are processed differently than decrements.
  • To determine if this difference persists when only the change detector system is activated.
  • To examine the role of intensity difference in eliciting neural responses to auditory deviants.

Main Methods:

  • Participants listened to a rule-based alternating high-low intensity tone pattern (1000 Hz) while ignoring auditory stimuli.
  • Deviants were created by repeating a tone, forming psychological increments or decrements.
  • Intensity differences of 3, 9, or 27 dB were tested; Mismatch Negativity (MMN) and P3a responses were measured.

Main Results:

  • A significant Mismatch Negativity (MMN) was elicited only at a 27 dB intensity separation.
  • The MMN peaked earlier and had a larger amplitude for psychological increments compared to decrements.
  • Psychological increments did not elicit a later P3a, unlike typical attention-grabbing stimuli.

Conclusions:

  • Psychological intensity increments are processed differently than decrements, even when transient system activation is controlled.
  • The auditory system distinguishes between predicted increases and decreases in intensity based on past patterns.
  • MMN characteristics reflect the direction of intensity change relative to auditory prediction, not solely attention capture.