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Related Experiment Videos

Cortical deafness to dissonance.

I Peretz1, A J Blood, V Penhune

  • 1Department of Psychology and Institut universitaire de gériatrie de Montréal, University of Montreal, Quebec, Canada. Isabelle.Peretz@umontreal.ca

Brain : a Journal of Neurology
|May 4, 2001
PubMed
Summary
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Music perception disorders reveal that the brain processes dissonance separately from emotion. Damage to auditory cortex prevents distinguishing musical consonance from dissonance, but emotional responses remain intact.

Area of Science:

  • Neuroscience
  • Psychoacoustics
  • Music Cognition

Background:

  • Consonant musical intervals are generally perceived as more pleasant than dissonant ones by most listeners, including infants.
  • A patient (I.R.) with bilateral auditory cortex lesions experienced music perception and memory deficits, providing a unique case to study consonance-dissonance processing.

Observation:

  • I.R. could not differentiate between consonant and dissonant musical excerpts, rating their pleasantness similarly.
  • Despite this, I.R. could still identify the emotional valence (happy/sad) of the music, indicating preserved affective responses.
  • This lack of dissonance discrimination was replicated using chord sequences previously used in emotional response studies.

Findings:

  • Brain imaging (CT scan co-registered with PET data) showed I.R.'s lesions overlapped with auditory processing regions but not paralimbic areas involved in emotion.

Related Experiment Videos

  • This suggests that the perceptual analysis of musical dissonance is distinct from its subsequent emotional interpretation.
  • Dissonance computation appears to involve bilateral mechanisms in the superior temporal gyri.

    • Implications:

    • The findings propose that the brain computes musical dissonance in the superior temporal gyri before emotional centers process it.
    • This research highlights specialized neural mechanisms for processing musical features separate from emotional responses.
    • Understanding these distinct pathways offers insights into music perception disorders and the neural basis of musicality.