Brain Structure and Function

, Volume 224, Issue 2, pp 937–947 | Cite as

Sex differences in somatomotor representations of others’ pain: a permutation-based analysis

  • Leonardo Christov-MooreEmail author
  • Marco Iacoboni
Original Article


Sex differences in empathy for pain have been repeatedly observed. However, it is unclear whether this is due to sex differences in “bottom-up” somatomotor representations of others’ pain (self-other resonance) or to “top-down” prefrontal control of such responses. Here, we provide data from 70 subjects suggesting that sex differences in empathy for pain lie primarily in pre-reflective, bottom-up resonance mechanisms. Subjects viewed a right hand pierced by a needle during fMRI. They also filled out a self-report measure of trait empathy, the Interpersonal Reactivity Index. A permutation-based analysis (FSL’s Randomise) found that females showed greater signal in a cluster in primary somatomotor cortex that includes the motor hand area. No significant differences were observed in other task-implicated areas. An examination of condition-specific parameter estimates found that this difference was due to reduced signal in this cluster in males. No significant differences in resting connectivity or within-task (generalized psychophysiological interaction analysis or gPPI) dynamic connectivity of this region with prefrontal areas were observed. While female subjects scored higher on affective subscales of the IRI, there were no sex differences in Perspective-Taking, the primary index of cognitive, top-down empathy processes. These findings suggest that localized internal somatomotor representations of others’ pain, a functional index of bottom-up resonance processes, are stronger in female subjects.


Sex Pain Empathy Functional magnetic resonance imaging Cognitive neuroscience 



This work was supported by the National Institute of Mental Health under grant R21 MH097178 to M. I., and by the National Science Foundation under a Graduate Fellowship Grant DGE-1144087 to L.C.M. For generous support, the authors also wish to thank the Brain Mapping Medical Research Organization, Brain Mapping Support Foundation, Pierson-Lovelace Foundation, The Ahmanson Foundation, William M. and Linda R. Dietel Philanthropic Fund at the Northern Piedmont Community Foundation, Tamkin Foundation, Jennifer Jones-Simon Foundation, Capital Group Companies Charitable Foundation, Robson Family and Northstar Fund.

Compliance with ethical standards

Conflict of interest

The authors have no conflicts of interest to declare.

Ethical standards

All recruitment and experimental procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from all individual participants included in the study.

Supplementary material

429_2018_1814_MOESM1_ESM.docx (98 kb)
Supplementary material 1 (DOCX 98 KB)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Ahmanson-Lovelace Brain Mapping CenterBrain Research Institute, UCLALos AngelesUSA
  2. 2.The Jane and Terry Semel Institute for Neuroscience and Human BehaviorDavid Geffen School of Medicine at UCLALos AngelesUSA

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