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Pathways to seeing music: enhanced structural connectivity in colored-music synesthesia
Anna Zamm1, Gottfried Schlaug, David M Eagleman
1Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215,USA.
Neuroimage
|March 5, 2013
Summary
Colored-music synesthesia is linked to enhanced white matter integrity in the inferior fronto-occipital fasciculus (IFOF). This suggests increased brain connectivity underlies cross-modal associations in synesthetes.
Area of Science:
- Neuroscience
- Cognitive Science
- Psychology
Background:
- Synesthesia involves cross-modal sensory experiences.
- Grapheme-color synesthesia research suggests hyperconnectivity or disinhibited feedback.
- Neuroanatomical basis of other synesthesia forms remains less explored.
Purpose of the Study:
- Investigate white matter correlates of colored-music synesthesia.
- Hypothesize unique connectivity patterns between visual and auditory areas.
- Explore the neuroanatomy of sound-to-color perception.
Main Methods:
- Diffusion tensor imaging (DTI) used to trace white matter tracts.
- Study included 10 synesthetes and 10 matched controls.
- Focused on temporal and occipital lobe white matter.
Main Results:
- Synesthetes showed distinct fractional anisotropy patterns in the inferior fronto-occipital fasciculus (IFOF).
- Significantly greater white matter integrity in the right IFOF for synesthetes.
- White matter integrity correlated with audiovisual test scores, particularly near the right fusiform gyrus.
Conclusions:
- First evidence of a white matter substrate for colored-music synesthesia.
- Enhanced white matter connectivity may underlie heightened cross-modal associations.
- Findings contribute to understanding the neural basis of synesthesia.
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