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First-impression bias effects on mismatch negativity to auditory spatial deviants.

Kaitlin Fitzgerald1,2, Alexander Provost1,2, Juanita Todd1,2

  • 1School of Psychology, University of Newcastle, Callaghan, New South Wales, Australia.

Psychophysiology
|October 4, 2017
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Summary
This summary is machine-generated.

First impressions bias auditory perception, influencing mismatch negativity (MMN) responses to sound cues. This "first-impression bias" affects how the brain processes unexpected sounds, even when probabilities change.

Keywords:
EEGauditory processescognitionerror processinghemispheric differences/lateralitysensation/perception

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Cognitive Psychology

Background:

  • Internal models predict sensory input, conserving neural resources for novelty.
  • Mismatch negativity (MMN) reflects violations of auditory regularities, signaling model inaccuracies.
  • Existing theories predict increased MMN with regularity stability, but first-impression bias contradicts this.

Purpose of the Study:

  • To investigate if the 'first-impression bias' observed in auditory MMN generalizes to spatial sound cues.
  • To examine how initial exposure to deviant tones influences subsequent MMN responses in different auditory contexts.

Main Methods:

  • Utilized a multicontext sequence structure with rotating probabilities for auditory stimuli.
  • Measured mismatch negativity (MMN) in response to monaural and binaural spatial sound cues.
  • Compared MMN amplitudes elicited by initial deviant tones versus tones later encountered as deviant.

Main Results:

  • A differential MMN modulation pattern, consistent with first-impression bias, was observed in two of three experimental groups.
  • The bias persisted throughout probability rotations, indicating influence beyond local statistics.
  • The effect was absent in one group receiving monaural stimulation to the right ear, suggesting context-specific modulation.

Conclusions:

  • First-impression bias significantly influences sensory inference in the auditory system, extending beyond simple probability statistics.
  • This bias partially generalizes to spatially deviant sound cues, demonstrating a robust effect on auditory processing.
  • Further research is needed to explain the absence of the bias in specific monaural stimulation conditions.