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A Tractography Analysis of Two Deep Brain Stimulation White Matter Targets for Depression
Open accessAbstract
Background Deep brain stimulation (DBS) of the subcallosal cingulate white matter (SCCwm) or anterior limb of the internal capsule (ALIC) may be effective in treating depression. Connectivity patterns of these regions may inform on mechanisms of action for DBS of these targets.Methods Diffusion tensor imaging (DTI) and probabilistic tractography were performed in 13 nondepressed subjects to determine connectivity patterns of SCCwm and ALIC. Tract maps were generated for each target in each subject, and tract voxels were coded as being unique to either target or shared. Group level tract maps were generated by including only those voxels common to at least 10 of 13 (>75%) subjects.Results The two targets have distinct patterns of connectivity with regions of overlap. The SCCwm showed consistent ipsilateral connections to the medial frontal cortex, the full extent of the anterior and posterior cingulate, medial temporal lobe, dorsal medial thalamus, hypothalamus, nucleus accumbens, and the dorsal brainstem. The ALIC seed, in contrast, demonstrated widespread projections to frontal pole, medial temporal lobe, cerebellum, nucleus accumbens, thalamus, hypothalamus, and brainstem. Common to both targets, albeit through distinct white matter bundles, were connections to frontal pole, medial temporal lobe, nucleus accumbens, dorsal thalamus, and hypothalamus.Conclusions Connectivity patterns of these two DBS white matter targets suggest distinct neural networks with areas of overlap in regions implicated in depression and antidepressant response.
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“DBS targets in the VC/VS region structurally and functionally connect to the MFB and partially to the SCC [91], but the SCC has selective fibers that are not directly connected to VC/VS or NAc [92,93].”
From Deep brain stimulation for depression. (2022) · cites this paper as [92]
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“In addition, this structure and neighbouring medial frontal regions and linked basal ganglia have been also been strikingly linked with mood regulation, including depression and anxiety (Drevets et al., 2008; Gutman et al., 2009; Johansen-Berg et al., 2008; Mayberg et al., 2005).”
From The human parental brain: In vivo neuroimaging (2011) · cites this paper as Gutman et al., 2009
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Advances in functional and structural MR image analysis and implementation as FSL
Smith, S. M., Jenkinson, M., Woolrich, M. W., Beckmann, C. F., Behrens, T. E. J., Johansen-Berg, H., Bannister, P. R., De Luca, M., Drobnjak, I., Flitney, D. E., et al. (2004) · NeuroImage · doi:10.1016/j.neuroimage.2004.07.051 · Cited by 13,630
Self-citationFast robust automated brain extraction
Smith, S. M. (2002) · Human Brain Mapping · doi:10.1002/hbm.10062 · Cited by 10,496
A global optimisation method for robust affine registration of brain images
Jenkinson, M., & Smith, S. M. (2001) · Medical Image Analysis · doi:10.1016/s1361-8415(01)00036-6 · Cited by 6,983
Deep Brain Stimulation for Treatment-Resistant Depression
Mayberg, H. S., Lozano, A. M., Voon, V., McNeely, H. E., Seminowicz, D., Hamani, C., Schwalb, J. M., & Kennedy, S. H. (2005) · Neuron · doi:10.1016/j.neuron.2005.02.014 · Cited by 4,059
Self-citationJ Neuropsychiatry Clin Neurosci
Yudofsky, S. C., & Hales, R. E. (1992) · The Journal of Neuropsychiatry and Clinical Neurosciences · doi:10.1176/jnp.4.4.359 · Cited by 3,818
Probabilistic diffusion tractography with multiple fibre orientations: What can we gain?
Behrens, T. E. J., Berg, H. J., Jbabdi, S., Rushworth, M. F. S., & Woolrich, M. W. (2007) · NeuroImage · doi:10.1016/j.neuroimage.2006.09.018 · Cited by 3,471
Self-citationCharacterization and propagation of uncertainty in diffusion-weighted MR imaging
Behrens, T. E. J., Woolrich, M. W., Jenkinson, M., Johansen‐Berg, H., Nunes, R. G., Clare, S., Matthews, P. M., Brady, J. M., & Smith, S. M. (2003) · Magnetic Resonance in Medicine · doi:10.1002/mrm.10609 · Cited by 3,038
Self-citationOngur, D. (2000) · Cerebral Cortex · doi:10.1093/cercor/10.3.206 · Cited by 2,627
Non-invasive mapping of connections between human thalamus and cortex using diffusion imaging
Behrens, T. E. J., Johansen-Berg, H., Woolrich, M. W., Smith, S. M., Wheeler-Kingshott, C. A. M., Boulby, P. A., Barker, G. J., Sillery, E. L., Sheehan, K., Ciccarelli, O., et al. (2003) · Nature Neuroscience · doi:10.1038/nn1075 · Cited by 2,330
Self-citationStress, Depression, and Neuroplasticity: A Convergence of Mechanisms
Pittenger, C., & Duman, R. S. (2008) · Neuropsychopharmacology · doi:10.1038/sj.npp.1301574 · Cited by 1,795
Limbic-cortical dysregulation: a proposed model of depression
(1997) · The Journal of Neuropsychiatry and Clinical Neurosciences · doi:10.1176/jnp.9.3.471 · Cited by 1,585
Self-citationFunctional Repression of cAMP Response Element in 6-Hydroxydopamine-treated Neuronal Cells
Chalovich, E. M., Zhu, J.-H., Caltagarone, J., Bowser, R., & Chu, C. T. (2006) · Journal of Biological Chemistry · doi:10.1074/jbc.m602632200 · Cited by 1,385
Limbic connections of the orbital and medial prefrontal cortex in macaque monkeys
Carmichael, S. T., & Price, J. L. (1995) · Journal of Comparative Neurology · doi:10.1002/cne.903630408 · Cited by 1,197
Schmahmann, J. D., & Pandya, D. N. (2006) · doi:10.1093/acprof:oso/9780195104233.001.0001 · Cited by 1,157
Circuits and Circuit Disorders of the Basal Ganglia
DeLong, M. R., & Wichmann, T. (2007) · Archives of Neurology · doi:10.1001/archneur.64.1.20 · Cited by 1,074
Cingulate function in depression: a potential predictor of treatment response
Mayberg, H. S., Brannan, S. K., Mahurin, R. K., Jerabek, P. A., Brickman, J. S., Tekell, J. L., Silva, J. A., McGinnis, S., Glass, T. G., Martin, C. C., et al. (1997) · NeuroReport · doi:10.1097/00001756-199703030-00048 · Cited by 1,029
Self-citationDeep Brain Stimulation to Reward Circuitry Alleviates Anhedonia in Refractory Major Depression
Schlaepfer, T. E., Cohen, M. X., Frick, C., Kosel, M., Brodesser, D., Axmacher, N., Joe, A. Y., Kreft, M., Lenartz, D., & Sturm, V. (2008) · Neuropsychopharmacology · doi:10.1038/sj.npp.1301408 · Cited by 1,027
Subcallosal cingulate gyrus deep brain stimulation for treatment-resistant depression
Lozano, A. M., Mayberg, H. S., Giacobbe, P., Hamani, C., Craddock, R. C., & Kennedy, S. H. (2008) · Biological Psychiatry · doi:10.1016/j.biopsych.2008.05.034 · Cited by 1,024
Self-citationArchitectonic subdivision of the human orbital and medial prefrontal cortex
Öngür, D., Ferry, A. T., & Price, J. L. (2003) · Journal of Comparative Neurology · doi:10.1002/cne.10609 · Cited by 944
Water diffusion changes in wallerian degeneration and their dependence on white matter architecture
Pierpaoli, C., Barnett, A., Pajevic, S., Chen, R., Penix, L., Virta, A., & Basser, P. (2001) · NeuroImage · doi:10.1006/nimg.2001.0765 · Cited by 938
Deep Brain Stimulation of the Ventral Capsule/Ventral Striatum for Treatment-Resistant Depression
Malone, D. A., Dougherty, D. D., Rezai, A. R., Carpenter, L. L., Friehs, G. M., Eskandar, E. N., Rauch, S. L., Rasmussen, S. A., Machado, A. G., Kubu, C. S., et al. (2009) · Biological Psychiatry · doi:10.1016/j.biopsych.2008.08.029 · Cited by 897
Cingulate cortex of the rhesus monkey: II. Cortical afferents
Vogt, B. A., & Pandya, D. N. (1987) · Journal of Comparative Neurology · doi:10.1002/cne.902620208 · Cited by 854
Nuttin, B., Cosyns, P. R., Demeulemeester, H. G., Gybels, J., & Meyerson, B. A. (1999) · The Lancet · doi:10.1016/s0140-6736(99)02376-4 · Cited by 854
Three-Year Outcomes in Deep Brain Stimulation for Highly Resistant Obsessive–Compulsive Disorder
Greenberg, B. D., Malone, D. A., Friehs, G. M., Rezai, A. R., Kubu, C. S., Malloy, P. F., Salloway, S., Okun, M. S., Goodman, W. K., & Rasmussen, S. A. (2006) · Neuropsychopharmacology · doi:10.1038/sj.npp.1301165 · Cited by 835
Kennedy, S. H., Evans, K. R., Krüger, S., Mayberg, H. S., Meyer, J. H., McCann, S., Arifuzzman, A. I., Houle, S., & Vaccarino, F. J. (2001) · American Journal of Psychiatry · doi:10.1176/appi.ajp.158.6.899 · Cited by 710
Self-citationLimbic-frontal circuitry in major depression: a path modeling metanalysis
Seminowicz, D. A., Mayberg, H. S., McIntosh, A. R., Goldapple, K., Kennedy, S., Segal, Z., & Rafi-Tari, S. (2004) · NeuroImage · doi:10.1016/j.neuroimage.2004.01.015 · Cited by 710
Self-citationChanges in connectivity profiles define functionally distinct regions in human medial frontal cortex
Johansen‐Berg, H., Behrens, T. E. J., Robson, M. D., Drobnjak, I., Rushworth, M. F. S., Brady, J. M., Smith, S. M., Higham, D. J., & Matthews, P. M. (2004) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0403743101 · Cited by 706
Self-citationHaber, S. N., Kim, K.-S., Mailly, P., & Calzavara, R. (2006) · The Journal of Neuroscience · doi:10.1523/jneurosci.0271-06.2006 · Cited by 686
Determinants of anisotropic water diffusion in nerves
Beaulieu, C., & Allen, P. S. (1994) · Magnetic Resonance in Medicine · doi:10.1002/mrm.1910310408 · Cited by 606
The orbital and medial prefrontal circuit through the primate basal ganglia
Haber, S., Kunishio, K., Mizobuchi, M., & Lynd-Balta, E. (1995) · The Journal of Neuroscience · doi:10.1523/jneurosci.15-07-04851.1995 · Cited by 605
Johansen‐Berg, H., Behrens, T. E. J., Sillery, E., Ciccarelli, O., Thompson, A. J., Smith, S. M., & Matthews, P. M. (2004) · Cerebral Cortex · doi:10.1093/cercor/bhh105 · Cited by 571
Self-citationJohansen-Berg, H., Gutman, D. A., Behrens, T. E. J., Matthews, P. M., Rushworth, M. F. S., Katz, E., Lozano, A. M., & Mayberg, H. S. (2008) · Cerebral Cortex · doi:10.1093/cercor/bhm167 · Cited by 561
Self-citationConnectivity-Based Parcellation of Broca's Area
Anwander, A., Tittgemeyer, M., von Cramon, D., Friederici, A., & Knosche, T. (2006) · Cerebral Cortex · doi:10.1093/cercor/bhk034 · Cited by 531
Diffusion Tensor Imaging and Axonal Tracking in the Human Brainstem
Stieltjes, B., Kaufmann, W. E., van Zijl, P. C. M., Fredericksen, K., Pearlson, G. D., Solaiyappan, M., & Mori, S. (2001) · NeuroImage · doi:10.1006/nimg.2001.0861 · Cited by 492
Efferent Association Pathways from the Rostral Prefrontal Cortex in the Macaque Monkey
Petrides, M., & Pandya, D. Ν. (2007) · Journal of Neuroscience · doi:10.1523/jneurosci.2419-07.2007 · Cited by 441
Croxson, P. L., Johansen-Berg, H., Behrens, T. E. J., Robson, M. D., Pinsk, M. A., Gross, C. G., Richter, W., Richter, M. C., Kastner, S., & Rushworth, M. F. S. (2005) · The Journal of Neuroscience · doi:10.1523/jneurosci.1311-05.2005 · Cited by 410
Self-citationHigh-speed imaging reveals neurophysiological links to behavior in an animal model of depression
Airan, R. D., Meltzer, L. A., Roy, M., Gong, Y., Chen, H., & Deisseroth, K. (2007) · Science · doi:10.1126/science.1144400 · Cited by 396
Connection Patterns Distinguish 3 Regions of Human Parietal Cortex
Rushworth, M. F. S., Behrens, T. E. J., & Johansen‐Berg, H. (2005) · Cerebral Cortex · doi:10.1093/cercor/bhj079 · Cited by 390
Self-citationSerial pathways from primate prefrontal cortex to autonomic areas may influence emotional expression
Barbas, H., Saha, S., Rempel-Clower, N., & Ghashghaei, T. (2003) · BMC Neuroscience · doi:10.1186/1471-2202-4-25 · Cited by 380
Jiménez, F., Velasco, F., Salin-Pascual, R., Hernández, J. A., Velasco, M., Criales, J. L., & Nicolini, H. (2005) · Neurosurgery · doi:10.1227/01.neu.0000170434.44335.19 · Cited by 291
Primate cingulostriatal projection: Limbic striatal versus sensorimotor striatal input
Kunishio, K., & Haber, S. N. (1994) · The Journal of Comparative Neurology · doi:10.1002/cne.903500302 · Cited by 290
Appleby, B. S., Duggan, P. S., Regenberg, A. C., & Rabins, P. V. (2007) · Movement Disorders · doi:10.1002/mds.21551 · Cited by 290
Heiervang, E., Behrens, T. E. J., Mackay, C. E., Robson, M. D., & Johansen-Berg, H. (2006) · NeuroImage · doi:10.1016/j.neuroimage.2006.07.037 · Cited by 259
Self-citationPositron emission tomography imaging in depression: a neural systems perspective
Mayberg, H. S. (2003) · Neuroimaging Clinics of North America · doi:10.1016/s1052-5149(03)00104-7 · Cited by 255
Self-citationValidation of in vitro probabilistic tractography
Dyrby, T. B., Søgaard, L. V., Parker, G. J., Alexander, D. C., Lind, N. M., Baaré, W. F. C., Hay-Schmidt, A., Eriksen, N., Pakkenberg, B., Paulson, O. B., et al. (2007) · NeuroImage · doi:10.1016/j.neuroimage.2007.06.022 · Cited by 236
Dauguet, J., Peled, S., Berezovskii, V., Delzescaux, T., Warfield, S. K., Born, R., & Westin, C.-F. (2007) · NeuroImage · doi:10.1016/j.neuroimage.2007.04.067 · Cited by 233
Price, J. L., Carmichael, S. T., & Drevets, W. C. (1996) · Progress in Brain Research · doi:10.1016/s0079-6123(08)61885-3 · Cited by 222
Okun, M. S., Mann, G., Foote, K. D., Shapira, N. A., Bowers, D., Springer, U. S., Knight, W. A., Martin, P., & Goodman, W. K. (2006) · Journal of Neurology Neurosurgery & Psychiatry · doi:10.1136/jnnp.2006.095315 · Cited by 214
Hadjipavlou, G., Dunckley, P., Behrens, T. E. J., & Tracey, I. (2006) · Pain · doi:10.1016/j.pain.2006.02.027 · Cited by 203
Self-citationCiccarelli, O. (2006) · Brain · doi:10.1093/brain/awl100 · Cited by 192
Vaucher, E., Tong, X., Cholet, N., Lantin, S., & Hamel, É. (2000) · The Journal of Comparative Neurology · doi:10.1002/(sici)1096-9861(20000529)421:2 · Cited by 126
Neurostimulation therapies in depression: a review of new modalities
Marangell, L. B., Martínez, M., Jurdi, R. A., & Zboyan, H. A. (2007) · Acta Psychiatrica Scandinavica · doi:10.1111/j.1600-0447.2007.01033.x · Cited by 107
Kosel, M., Sturm, V., Frick, C., Lenartz, D., Zeidler, G., Brodesser, D., & Schlaepfer, T. E. (2006) · Journal of Psychiatric Research · doi:10.1016/j.jpsychires.2006.07.010 · Cited by 99
Connectivity of the human periventricular—periaqueductal gray region
Sillery, E., Bittar, R. G., Robson, M. D., Behrens, T. E. J., Stein, J. F., Aziz, T. Z., & Johansen‐Berg, H. (2005) · Journal of neurosurgery · doi:10.3171/jns.2005.103.6.1030 · Cited by 80
Self-citationComputational analysis of deep brain stimulation
McIntyre, C. C., Miocinovic, S., & Butson, C. R. (2007) · Expert Review of Medical Devices · doi:10.1586/17434440.4.5.615 · Cited by 65
Follett, K. A. (2004) · Neurosurgical FOCUS · doi:10.3171/foc.2004.17.1.3 · Cited by 63
Targeting Neurotrophic/Growth Factor Expression and Signaling for Antidepressant Drug Development
Tanis, K. Q., Newton, S. S., & Duman, R. S. (2007) · CNS & Neurological Disorders - Drug Targets · doi:10.2174/187152707780363276 · Cited by 57
Sakas, D. E., Panourias, I. G., & Simpson, B. A. (2007) · Springer eBooks · doi:10.1007/978-3-211-33081-4_1 · Cited by 44
Brain Correlates of Antidepressant Treatment Outcome from Neuroimaging Studies in Depression
Dougherty, D. D., & Rauch, S. L. (2007) · Psychiatric Clinics of North America · doi:10.1016/j.psc.2006.12.007 · Cited by 32
Somatic Therapies for Treatment- Resistant Depression: New Neurotherapeutic Interventions
Dougherty, D. D., & Rauch, S. L. (2007) · Psychiatric Clinics of North America · doi:10.1016/j.psc.2006.12.006 · Cited by 25
Global optimisation for robust affine registration
Jenkinson, M., & Smith, S. M. (2000) · NeuroImage · doi:10.1016/s1053-8119(00)91410-1 · Cited by 17
Connectional networks within the orbital and medial prefrontal cortex of macaque monkeys
Carmichael, S. T., & Price, J. L. (1996) · Journal of Comparative Neurology · doi:10.1002/(sici)1096-9861(19960722)371:2
An, X., Bandler, R., �ng�r, D., & Price, J. L. (1998) · The Journal of Comparative Neurology · doi:10.1002/(sici)1096-9861(19981130)401:4
Flagged first, then by citations
1 of the 65 references couldn’t be matched to a known paper.
Research works printed but not linked: 5
- Mayberg, 2006, Defining neurocircuits in depression: Insight from functional neuroimaging studies of diverse treatments, Psychiatr Ann, 36, 259
- Mayberg, 2006, Defining neurocircuits in depression: Insights from functional neuroimaging studies of diverse treatments, Psychiatr Ann, 36, 258
- Schlaepfer, 2008, Deep brain stimulation to reward circuitry alleviates anhedonia in refractory major depression, Neuropsychopharmacology, 33, 368, 10.1038/sj.npp.1301408 · DOI · Paper page
- An, 1998, Prefrontal cortical projections to longitudinal columns in the midbrain periaqueductal gray in macaque monkeys, J Comp Neurol, 401, 455, 10.1002/(SICI)1096-9861(19981130)401:4<455::AID-CNE3>3.0.CO;2-6 · DOI · Paper page
- Stieltjes, 2001, Diffusion tensor imaging and axonal tracking in the human brainstem, Neuroimage, 14, 723, 10.1006/nimg.2001.0861 · DOI · Paper page
Cited by
Sorted by citations
Deep Brain Stimulation for Treatment-Resistant Depression
Mayberg, H. S., Lozano, A. M., Voon, V., McNeely, H. E., Seminowicz, D., Hamani, C., Schwalb, J. M., & Kennedy, S. H. (2005) · Neuron · doi:10.1016/j.neuron.2005.02.014 · Cited by 4,059
Self-citationBewernick, B. H., Hurlemann, R., Matusch, A., Kayser, S., Grubert, C., Hadrysiewicz, B., Axmacher, N., Lemke, M., Cooper-Mahkorn, D., Cohen, M. X., et al. (2010) · Biological Psychiatry · doi:10.1016/j.biopsych.2009.09.013 · Cited by 865
Fox, M. D., Buckner, R. L., Liu, H., Chakravarty, M. M., Lozano, A. M., & Pascual-Leone, A. (2014) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1405003111 · Cited by 617
Subcallosal Cingulate Deep Brain Stimulation for Treatment-Resistant Unipolar and Bipolar Depression
Holtzheimer, P. E. (2012) · Archives of General Psychiatry · doi:10.1001/archgenpsychiatry.2011.1456 · Cited by 608
Self-citationThe default-mode, ego-functions and free-energy: a neurobiological account of Freudian ideas
Carhart-Harris, R. L., & Friston, K. J. (2010) · Brain · doi:10.1093/brain/awq010 · Cited by 574
Metadata
- Authors
- Gutman, D. A., Holtzheimer, P. E., Behrens, T. E. J., Johansen-Berg, H., & Mayberg, H. S.
- Affiliations
- Emory University (US)
- University of Oxford (GB)
- Corresponding author
- Gutman, David A.
- Venue
- Biological Psychiatry
- Publisher
- Elsevier BV
- Published
- 2009-02
- Volume
- 65
- Issue
- 4
- Pages
- 276-282
- ISSN
- 0006-3223 (ISSN-L)
- PMC
- PMC4423548
- OpenAlex
- W2111456519
- Cited by
- 220
- References
- 65
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 6 · 2023: 8 · 2022: 7 · 2021: 8 · 2020: 7 · 2019: 5 · 2018: 9 · 2017: 10 · 2016: 10 · 2015: 15 · 2014: 26 · 2013: 22 · 2012: 24
- FWCI
- 11.98
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Biological Psychiatry (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- Stanley Medical Research Institute
- National Alliance for Research on Schizophrenia and Depression (K23 MH077869)
- Wellcome Trust
- Medical Research Council
- Dana Foundation
- Topics
- Health Sciences › Medicine › Clinical Neurology › Deep Brain Stimulation and Movement Disorders
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
- Social Sciences › Psychology › Clinical Psychology › Obsessive-Compulsive Spectrum Disorders
- Keywords
- deep brain stimulation, depression, anterior limb of the internal capsule, white matter connectivity, probabilistic tractography, artificial neural networks, nucleus accumbens, medial temporal lobe, thalamus, hypothalamus, frontal pole, antidepressant response
- MeSH terms
- Adult, Brain Mapping, Depressive Disorder, Female, Gyrus Cinguli, Humans, Image Processing, Computer-Assisted, Male, Neural Pathways, Models, Statistical, Internal Capsule, Diffusion Magnetic Resonance Imaging, Deep Brain Stimulation, Young Adult
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