Early neural responses underlie advantages for consonance over dissonance

Area of Science:

• Neuroscience
• Psychoacoustics
• Music Cognition

Background:

• Consonant musical intervals are generally perceived as more pleasant and are processed more easily than dissonant intervals.
• The neural mechanisms underlying this processing difference and the influence of musical training remain incompletely understood.

Purpose of the Study:

• To investigate the neural basis for the differential processing of consonant versus dissonant musical intervals.
• To examine how formal musical training modulates the brain's response to changes in musical consonance and dissonance.

Main Methods:

• Event-related brain potentials (ERPs) were recorded from musicians and non-musicians.
• Participants listened to sequences of either consonant or dissonant intervals, with occasional deviant intervals.
• A mismatch negativity (MMN) component was analyzed to assess neural responses to deviant stimuli within each context.

Main Results:

• Changes in consonant intervals elicited a mismatch negativity (MMN) in both musicians and non-musicians, indicating rapid processing.
• Changes in dissonant intervals elicited a late MMN, but only in participants with extensive musical training.
• Neural responses to auditory changes differ significantly between consonant and dissonant contexts.

Conclusions:

• The brain's rapid processing of consonant interval changes, evident in both trained and untrained individuals, may underlie consonance's processing advantage.
• Formal musical training specifically enhances the neural processing of dissonant interval changes, suggesting a learned modulation of auditory perception.
• These findings provide insights into the neural underpinnings of musical consonance/dissonance perception and the impact of expertise.