Journal
NEUROIMAGE
Volume 209, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2019.116509
Keywords
Affective prosody; Functional MRI; Language; Lateralization; LI
Funding
- NIH [R01 DC 016902, R21 HD 095273, NCATS KL2 TR001432, 5T32 HD 046388, K18 DC014558]
- Georgetown's Dean's Toulmin Pilot Award
- American Heart Association [17GRNT33650054]
- Feldstein Veron Innovation Fund
- NIH-funded DC Intellectual and Developmental Disabilities Research Center [U54 HD090257]
- Center for Brain Plasticity and Recovery at Georgetown University
- MedStar National Rehabilitation Hospital
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While language processing is often described as lateralized to the left hemisphere (LH), the processing of emotion carried by vocal intonation is typically attributed to the right hemisphere (RH) and more specifically, to areas mirroring the LH language areas. However, the evidence base for this hypothesis is inconsistent, with some studies supporting right-lateralization but others favoring bilateral involvement in emotional prosody processing. Here we compared fMRI activations for an emotional prosody task with those for a sentence comprehension task in 20 neurologically healthy adults, quantifying lateralization using a lateralization index. We observed right-lateralized frontotemporal activations for emotional prosody that roughly mirrored the left-lateralized activations for sentence comprehension. In addition, emotional prosody also evoked bilateral activation in pars orbitalis (BA47), amygdala, and anterior insula. These findings are consistent with the idea that analysis of the auditory speech signal is split between the hemispheres, possibly according to their preferred temporal resolution, with the left preferentially encoding phonetic and the right encoding prosodic information. Once processed, emotional prosody information is fed to domain-general emotion processing areas and integrated with semantic information, resulting in additional bilateral activations.
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