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Spatial auditory regularity encoding and prediction: Human middle-latency and long-latency auditory evoked

M Cornella1, A Bendixen2, S Grimm3

  • 1Institute for Brain, Cognition and Behavior (IR3C), University of Barcelona, Catalonia, Spain; Cognitive Neuroscience Research Group, Department of Psychiatry and Clinical Psychobiology, University of Barcelona, Catalonia, Spain.

Brain Research
|April 28, 2015
PubMed
Summary
This summary is machine-generated.

The brain predicts auditory events using spatial regularities. Early brain responses (middle latency response) show faster detection of predictable patterns than previously thought.

Keywords:
Auditory regularityLong latency responseMiddle latency responsePrediction

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Cognitive Science

Background:

  • The human brain predicts future auditory events by encoding environmental regularities.
  • Deviations from these regularities are detected early, indicated by middle latency responses (MLR), preceding long-latency responses (LLR) like mismatch negativity (MMN).

Purpose of the Study:

  • To investigate MLR and LLR signatures of spatial auditory regularity encoding and prediction generation.
  • To differentiate brain responses to predictable versus unpredictable auditory sequences.

Main Methods:

  • Monaural delivery of chirps in regular (left-right-left-right) and random (unpredictable alternation/repetition) sequences.
  • Inclusion of occasional stimulus omissions in both predictable and unpredictable contexts.
  • Electrophysiological recording to analyze MLR and LLR components.

Main Results:

  • The Na component (34ms) was attenuated in the regular condition compared to the random condition.
  • No significant differences in stimulus omission responses were found in the MLR range.
  • Larger chirp- and omission-evoked responses were observed in the LLR range for the regular condition.
  • Predictability effects were more pronounced in the right hemisphere for LLRs.

Conclusions:

  • Findings suggest a hierarchical organization for encoding spatial auditory regularities.
  • Early (MLR) and late (LLR) electrophysiological responses reflect different aspects of prediction and deviance detection in auditory processing.