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Lesion Network Localization of Free Will

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Lesion Network Localization of Free Will Lesion network localization of free will R. Ryan Darbya,b,c,1, Juho Joutsab,d,e,f, Matthew J. Burkeb, and Michael D. Foxb,c,d,1 aDepartment of Neurology, Vanderbilt University Medical Center, Nashville, TN 37232; bBerenson-Allen Center for Noninvasive Brain Stimulation, Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical Center, Boston, MA 02215; cDepartment of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02214; dAthinoula A. Martinos Centre for Biomedical Imaging, Massachusett General Hospital, Harvard Medical School, Charlestown, MA 02129; eDepartment of Neurology, University of Turku, 20520, Turku, Finland; and fDivision of Clinical Neurosciences, Turku University Hospital, 20520, Turku, Finland Edited by Robert Desimone, Massachusetts Institute of Technology, Cambridge, MA, and approved August 30, 2018 (received for review August 16, 2018) Our perception of free will is composed of a desire to act (volition) and perception have been highly heterogeneous across different a sense of responsibility for our actions (agency). Brain damage can studies (13, 14). Even focal brain lesions, often considered the disrupt these processes, but which regions are most important for free gold standard for neuroanatomical localization (19–21), can will perception remains unclear. Here, we study focal brain lesions that occur in multiple different brain locations but cause similar disrupt volition, causing akinetic mutism (n = 28), or disrupt agency, disruptions in volition or agency (22, 23). causing alien limb syndrome (n = 50), to better localize these processes Lesion network mapping (Fig. 1) is a recently validated technique in the human brain. Lesion locations causing either syndrome were that identifies regions functionally connected to a lesion location, highly heterogeneous, occurring in a variety of different brain loca- allowing one to localize symptoms even when lesions occur in dif- tions. We next used a recently validated technique termed lesion net- ferent brain locations (24–28). For example, lesions that cause visual work mapping to determine whether these heterogeneous lesion hallucinations fall within a single brain network connected to the locations localized to specific brain networks. Lesion locations causing extrastriate visual cortex, lesions that cause pain fall within a net- akinetic mutism all fell within one network, defined by connectivity to work connected to the posterior insula, and lesions that cause the anterior cingulate cortex. Lesion locations causing alien limb fell aphasia fall within a network connected to the left inferior frontal within a separate network, defined by connectivity to the precuneus. gyrus (24). This approach has been validated for 2D approximations Both findings were specific for these syndromes compared with brain of 3D lesions including images of lesions from published articles lesions causing similar physical impairments but without disordered (24, 26) and has lent insight into complex but poorly understood free will. Finally, our lesion-based localization matched network local- neuropsychiatric syndromes such as abnormal movements (28, 29), ization for brain stimulation locations that disrupt free will and neuro- delusions (26), loss of consciousness (27), and criminal behavior imaging abnormalities in patients with psychiatric disorders of free (30). A similar approach has been applied to brain stimulation sites will without overt brain lesions. Collectively, our results demonstrate in different locations that relieve similar symptoms (31, 32). that lesions in different locations causing disordered volition and Here, we use this network localization approach to determine agency localize to unique brain networks, lending insight into the the neuroanatomical substrate of disordered free will perception. neuroanatomical substrate of free will perception. First, we test whether lesions in different brain locations causing akinetic mutism and alien limb are part of the same functionally free will | agency | volition | functional connectivity | lesions connected brain network. Second, we test for specificity by comparing our results to those for lesions causing similar phys- ong the domain of philosophy, free will can be investigated ical symptoms, but with intact perception of volition and agency. Lscientifically (1–6). Experiments such as those by Benjamin Finally, we test whether our localizations of volition and agency Libet sparked debate regarding whether free will exists or is an based on focal brain lesions align with brain stimulation sites illusion (1–3). This debate remains unsettled, but most re- altering free will perception and neuroimaging abnormalities in searchers agree that we perceive our actions to be freely willed psychiatric patients with disordered free will perception. (4–6). Recent investigations have therefore focused on un- derstanding this perception, dividing it into two processes: the Significance intention or motivation to act, referred to as volition (5), and the sense of responsibility for one’s action, referred to as agency (4). Free will consists of a desire to act (volition) and a sense of Many approaches have been used to identify brain regions responsibility for that action (agency), but the brain regions involved in the perception of volition or agency. For example, responsible for these processes remain unknown. We found direct electrical stimulation to some brain regions but not to – that brain lesions that disrupt volition occur in many different others can alter free will perception (7 10) while noninvasive locations, but fall within a single brain network, defined by brain stimulation can modulate experimental measures of agency connectivity to the anterior cingulate. Lesions that disrupt and volition (4, 6, 11, 12). Functional neuroimaging can identify agency also occur in many different locations, but fall within a brain regions whose activity correlates with volition or agency in separate network, defined by connectivity to the precuneus. normal subjects (13, 14) or is abnormal in patients with “disor- ” Together, these networks may underlie our perception of free ders of free will such as functional movement disorders, psy- will, with implications for neuropsychiatric diseases in which chogenic nonepileptic seizures (PNES), or catatonia (15, 16). these processes are impaired. Finally, patients with brain lesions in specific locations can ex- perience profound disruptions in volition and agency. For ex- Author contributions: R.R.D. and M.D.F. designed research; R.R.D. performed research; ample, patients with akinetic mutism lack the motivation to move R.R.D., J.J., and M.J.B. analyzed data; and R.R.D. and M.D.F. wrote the paper. or speak (17), while patients with alien limb syndrome feel that The authors declare no conflict of interest. their movement is generated by someone else (18). These lesion- This article is a PNAS Direct Submission. induced syndromes are often used as paradigmatic examples of Published under the PNAS license. disrupted volition and agency, respectively (15). 1To whom correspondence may be addressed. Email: [email protected] or Despite these studies, localization of volition and agency in the [email protected]. human brain remains unclear. Alterations in free will perception This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. have been reported following stimulation to a variety of different 1073/pnas.1814117115/-/DCSupplemental. brain regions (4, 6–12) and neuroimaging correlates of free will Published online October 1, 2018. 10792–10797 | PNAS | October 16, 2018 | vol. 115 | no. 42 www.pnas.org/cgi/doi/10.1073/pnas.1814117115 Downloaded by guest on September 29, 2021 y = 18, z = 32], which defines a spatial network that, by defini- tion, encompasses lesion locations disrupting volition (Fig. 2E). Lesion Network Localization of Disordered Agency. We identified 50 cases of brain lesions causing involuntary movements that pa- tients claimed they were not responsible for generating, a clinical syndrome termed alien limb (SI Appendix, Fig. S3 and Table S1). Again, lesion locations were diverse and included the medial frontal cortices (24%), corpus callosum (22%), parietal lobes (36%), and thalamus (8%) (Fig. 3A). While the lesions them- selves were spatially diverse, lesion network mapping showed that 45 of the 50 lesions (90%) fell within a single brain network defined by functional connectivity to the precuneus cortex (Fig. 3B and SI Appendix, Table S2). To assess specificity, we compared lesions causing alien limb to lesions causing hemichorea (SI Appendix, Fig. S2) (28). In hemichorea, patients have involuntary movements, similar to patients with alien limb; however, patients with hemichorea continue to feel responsible for these movements (i.e., intact agency) (15). We found that connectivity to the precuneus region Fig. 1. Lesion network mapping technique. (A) Three representative lesions was specific to lesions causing alien limb compared with hemi- causing akinetic mutism or abulia (disordered volition). (B) Network of re- chorea (Fig. 3C and SI Appendix, Table S3). gions functionally connected to each lesion location across a large (n = For illustration purposes, we computed functional connectivity 1,000) resting-state functional connectivity dataset. (C) Lesion network with our site of peak network overlap in the precuneus (Fig. 3D, overlap map showing regions connected to all or most lesion locations.
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