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Numeric aspects in pitch identification: an fMRI study.

Michael Schwenzer¹, Klaus Mathiak

¹Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, Aachen, Germany. mschwenzer@ukaachen.de

BMC Neuroscience

|March 12, 2011

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Pitch identification activates the intraparietal sulcus (IPS), similar to visual numerosity encoding. This finding distinguishes pitch identification from pitch discrimination based on brain activity.

Area of Science:

Neuroscience
Auditory Perception
Cognitive Neuroscience

Background:

Pitch identification shows unique response patterns compared to other auditory skills.
Selecting one pitch from many differs from detecting pitch changes.
Visual numerosity encoding activates the intraparietal sulcus.

Purpose of the Study:

To investigate if numerosity encoding during pitch identification activates the intraparietal sulcus.
To differentiate neural activation patterns for pitch identification versus other auditory tasks.

Main Methods:

Participants identified a single pitch from four options.
Functional magnetic resonance imaging (fMRI) compared neural activation during pitch identification with pitch contour perception, tone localization, and pitch discrimination.

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Main Results:

Pitch identification led to bilateral intraparietal sulcus activation, unlike pitch discrimination.
Correct pitch identification correlated with left intraparietal sulcus activity.
Pitch contour perception activated the superior temporal gyrus; differentiation between pitch identification and tone localization was not achieved.

Conclusions:

Pitch identification is neurologically distinct from pitch discrimination, evidenced by intraparietal sulcus activation.
Intraparietal sulcus activity in pitch identification may represent an auditory form of numerosity encoding.