Peter Williamson

Journal Articles

  1. Penner, J., Osuch, E.A., Schaefer, B., Théberge, J., Neufeld, R.W.J., Menon, R.S., Rajakumar, N., & P.C. Williamson. Higher order thalamic nuclei resting network connectivity in early schizophrenia and major depressive disorder.. Psychiatry Res Neuroimaging 272: 7-16 (2018) - [Published | PMID: 29247717 | Free Access]
  2. Taylor, R., Osuch, E.A., Schaefer, B., Rajakumar, N., Neufeld, R.W.J., Théberge, J., & P.C. Williamson. Neurometabolic abnormalities in schizophrenia and depression observed with magnetic resonance spectroscopy at 7 T. Br J Psychiatry 3(1): 6-11 (2017) - [Published | PMID: 28243459 | Free Access]
  3. Dempster, K., Norman, R., Théberge, J., Densmore, M., Schaefer, B., & P.C. Williamson. Cognitive performance is associated with gray matter decline in first-episode psychosis. Psychiatry Res Neuroimaging 264: 46-51 (2017) - [Published | PMID: 28458083 | Free Access]
  4. Osuch, E.A., Théberge, J., Neufeld, R.W.J., Mitchell, D.G., Williamson, P.C., & R.C. Gardner . Depression, marijuana use and early-onset marijuana use conferred unique effects on neural connectivity and cognition. Acta Psychiatr Scand 134(5): 399-409 (2016) - [Published]
  5. Taylor, R., Théberge, J., Williamson, P.C., Densmore, M., & R.W.J. Neufeld. ACC Neuro-over-Connectivity Is Associated with Mathematically Modeled Additional Encoding Operations of Schizophrenia Stroop-Task Performance. Front Psychol. 7: 1295 (2016) - [Published | PMID: 27695425]
  6. Taylor, R., Théberge, J., Williamson, P.C., Densmore, M., & R.W.J. Neufeld. ACC Neuro-over-Connectivity Is Associated with Mathematically Modeled Additional Encoding Operations of Schizophrenia Stroop-Task Performance . Front Psychol. 7(1295): 1-23 (2016) - [Published | PMID: 27695425 | Free Access]
  7. Penner, J., Ford, K.A., Taylor, R., Schaefer, B., Théberge, J., Neufeld, R.W.J., Osuch, E.A., Menon, R.S., Rajakumar, N., Allman, J.M., & P.C. Williamson. Medial prefrontal and anterior insular connectivity in early schizophrenia and major depressive disorder: a resting functional MRI evaluation of large-scale brain network models. Front Hum Neurosci. 10: 132 (2016) - [Published | PMID: 27064387]
  8. Taylor, R., Neufeld, R.W.J., Schaefer, B., Densmore, M., Rajakumar, N., Osuch, E.A., Williamson, P.C., & J. Théberge. Functional magnetic resonance spectroscopy of glutamate and glutamine in schizophrenia and major depressive disorder: anterior cingulate activity during a color-word Stroop task. npj Schizophrenia 1: 15028 (2015) - [Published | Free Access]
  9. Dempster, K., Norman, R., Théberge, J., Densmore, M., Schaefer, B., & P.C. Williamson. Glutamatergic Metabolite Correlation with Neuropsychological Tests in First Episode Schizophrenia. Psychiatry Res 233: 180-185 (2015) - [Published]
  10. Taylor, R., Schaefer, B., Densmore, M., Neufeld, R.W.J., Rajakumar, N., Williamson, P.C., & J. Théberge. "Increased Glutamate Observed Upon Functional Activation in the Anterior Cingulate Cortex Using the Stroop Task and Functional Spectroscopy". Neuroreport 26(3): 107-112 (2015) - [Published | PMID: 25536234 | Free Access]
  11. Ford, K.A., Wammes, M., Neufeld, R.W.J., Mitchell, D.G., Théberge, J., Williamson, P.C., & E.A. Osuch. Unique functional abnormalities in youth with combined marijuana use and depression: an FMRI study.. Frontiers in Psychiatry 5(130): 1-11 (2014) - [Published | PMID: 25309462 | Free Access]
  12. Greening, S., Osuch, E.A., Williamson, P.C., & D.G. Mitchell. "The neural correlates of regulating positive and negative emotions in medication-free major depression". Soc Cog Affect Neurosci 9: 628-637 (2014) - [Published]
  13. Ford, K.A., Théberge, J., Neufeld, R.W.J., Williamson, P.C., & E.A. Osuch. Correlation of brain default mode network activation with bipolarity index in youth with mood disorders. J Affect Disord 150(3): 1174-1178 (2013) - [Published | PMID: 23806586]
  14. Greening, S., Osuch, E.A., Williamson, P.C., & D.G. Mitchell. "Emotion-related brain activity to conflicting socio-emotional cues in umedicated depression". J Affect Disord 150: 1136-1141 (2013) - [Published]
  15. Miller, J.E., Drost, D., Jensen, J.E., Manchanda, R., Menon, R.S., Neufeld, R.W.J., Rajakumar, N., Pavlosky, W.F., Schaefer, B., & P.C. Williamson. "Progressive Membrane Metabolite Changes in First Episode Schizophrenia with High Field Magnetic Resonance Spectroscopy". Psychiatry Res 201: 25-33 (2012) - [Published]
  16. Williamson, P.C.. "A Framework for Interpreting Functional Networks in Schizophrenia". Front Neurosci 6: 1-14 (2012) - [Published]
  17. Aoyama, N., Théberge, J., Drost, D., Manchanda, R., Northcott, S., Neufeld, R.W.J., Menon, R.S., Rajakumar, N., Pavlosky, W.F., Densmore, M., Schaefer, B., & P.C. Williamson. Grey matter and social functioning correlates of glutamatergic metabolite loss in schizophrenia. Br J Psychiatry 198(6): 448-456 (2011) - [Published | PMID: 21628707]
  18. Mickleborough, M.J., Daniels, J.K., Coupland, N.J., Kao, R., Williamson, P.C., Lanius, U.F., Hegadoren, K.M., Schore, A., Densmore, M., Stevens, T. , & R.A. Lanius. Effects of Trauma-related Cues on Pain Processing in PTSD: A fMRI Investigation. J Psychiatry Neurosci 36: 6-14 (2011) - [Published]
  19. Daniels, J.K., McFarlane, A.C., Bluhm, R.L., Moores, K.A., Clark, C.R., Shaw, M.E., Williamson, P.C., Densmore, M., & R.A. Lanius. Switching between Executive and Default Mode Network in PTSD-Alterations in Functional Connectivity. J Psychiatry Neurosci 35(4): 258-266 (2010) - [Published]
  20. Biswal, B.B., Mennes, M., Zuo, X.-N., Gohel, S., Kelly, C., Smith, S.M., Beckmann, C.F., Adelstein, J.S., Buckner, R.L., Colcombe, S., Dogonowski, A.M., Ernst, M., Fair, D., Hampson, M., Hoptman, M.J., Hyde, J.S., Kiviniemi, V.J., Kötter, R., Li, S.-J., Lin, C.-P., Lowe, M.J., Mackay, C., Madden, D.J., Madsen, K.H., Margulies, D.S., Mayberg, H.S., McMahon, K., Monk, C.S., Mostofsky, S.H., Nagel, B.J., Pekar, J.J., Peltier, S.J., Petersen, S.E., Riedl, V., Rombouts, S.A.R.B., Rypma, B., Schlaggar, B.L., Schmidt, S., Seidler, R.D., Siegle, G., Sorg, C., Teng, G.J., Veijola, J., Villringer, A., Walter, M., Wang, L., Weng, X.-C., Whitfield-Gabrieli, S., Williamson, P.C., Windischberger, C., Zang, Y.-F., Zhang, H.-Y., Xavier Castellanos, F., & M.P. Milham. Towards Discovery Science of Human Brain Function. P Natl Acad Sci USA 107: 4734-4739 (2010) - [Published]
  21. Lanius, R.A., Bluhm, R.L., Coupland, N.J., Hegadoren, K.M., Rowe, B.H., Théberge, J., Neufeld, R.W.J., Williamson, P.C., & M. Brimson. Default mode network connectivity as a predictor of post-traumatic stress disorder symptom severity in acutely traumatized subjects. Acta Psychiatr Scand 121(1): 33-40 (2010) - [Published | PMID: 19426163 | Free Access]
  22. Bluhm, R.L., Miller, J.E., Lanius, R.A., Osuch, E.A., Boksman, K., Neufeld, R.W.J., Théberge, J., Schaefer, B., & P.C. Williamson. Retrosplenial cortex connectivity in schizophrenia. Psychiatry Res 174(1): 17-23 (2009) - [Published | PMID: 19783410 | Free Access]
  23. Osuch, E.A., Bluhm, R.L., Williamson, P.C., Théberge, J., Densmore, M., & R.W.J. Neufeld. Brain activation to favorite music in healthy controls and depressed patients. Neuroreport 20(13): 1204-1208 (2009) - [Published | PMID: 19617860 | Free Access]
  24. Bluhm, R.L., Williamson, P.C., Lanius, R.A., Théberge, J., Densmore, M., Bartha, R., Neufeld, R.W.J., & E.A. Osuch. Resting state default-mode network connectivity in early depression using a seed region-of-interest analysis: Decreased connectivity with caudate nucleus. Psychiatry Clin Neurosci 63(6): 754-761 (2009) - [Published | Free Access]
  25. Brun, C., Nicolson, R., Lepore, N., Chou, Y.Y., Vidal, C., DeVito, T., Drost, D., Williamson, P.C., Rajakumar, N., Toga, A., & P. Thompson. Mapping Brain Abnormalities in Boys with Autism. Human Brain Mapping 30: 3887-3900 (2009) - [Published]
  26. Miller, J.E., Williamson, P.C., Jensen, J.E., Manchanda, R., Menon, R.S., Neufeld, R.W.J., Rajakumar, N., Pavlosky, W.F., Densmore, M., Schaefer, B., & D. Drost. "Longitudinal 4.0T 31P Magnetic Resonance Spectroscopy Metabolic Changes in the Anterior Cingulate and Left Thalamus in First Episode Schizophrenia?. Psychiatry Res 173: 155 (2009) - [Published]
  27. Bluhm, R.L., Williamson, P.C., Osuch, E.A., Boksman, K., Neufeld, R.W.J., Théberge, J., & R.A. Lanius. Alterations in default network connectivity in posttraumatic stress disorder related to early-life trauma. J Psychiatry Neurosci 34(3): 187-194 (2009) - [Published | PMID: 19448848 | Free Access]
  28. Miller, J.E., Williamson, P.C., Jensen, J.E., Manchanda, R., Menon, R.S., Neufeld, R.W.J., Rajakumar, N., Pavlosky, W.F., Densmore, M., Schaefer, B., & D. Drost. Longitudinal 4.0T 31P Magnetic Resonance Spectroscopy Metabolic Changes in the Anterior Cingulate and Left Thalamus in First Episode Schizophrenia. Psychiatry Res 173(2): 155-157 (2009) - [Published | PMID: 19520552]
  29. Vidal, C., Nicolson, R., Boire, J., Barra, V., DeVito, T., Hayashi, K., Geaga, J., Drost, D., Williamson, P.C., Rajakumar, N., Toga, A., & P. Thompson. Three-dimensional mapping of the lateral ventricles in autism. Psychiatry Res 163(2): 106-115 (2008) - [Published | PMID: 18502618]
  30. Bluhm, R.L., Osuch, E.A., Lanius, R.A., Boksman, K., Neufeld, R.W.J., Théberge, J., & P.C. Williamson. Default mode network connectivity: effects of age, sex, and analytic approach. Neuroreport 19(8): 887-891 (2008) - [Published | PMID: 18463507 | Free Access]
  31. Théberge, J., Williamson, K., Aoyama, N., Drost, D., Manchanda, R., Malla, A.K., Northcott, S., Menon, R.S., Neufeld, R.W.J., Rajakumar, N., Pavlosky, W.F., Densmore, M., Schaefer, B., & P.C. Williamson. Longitudinal grey-matter and glutamatergic losses in first-episode schizophrenia. Br J Psychiatry 191: 325-334 (2007) - [Published | PMID: 17906243 | Free Access]
  32. DeVito, T., Drost, D., Neufeld, R.W.J., Rajakumar, N., Pavlosky, W.F., Williamson, P.C., & R. Nicolson. Evidence for cortical dysfunction in autism: a proton magnetic resonance spectroscopic imaging study. Biol Psychiatry 61(4): 465-473 (2007) - [Published | PMID: 17276747]
  33. Williamson, P.C.. Are Anticorrelated Networks in the Brain Relevant to Schizophrenia?. Schizophrenia Bulletin 33: 994-1003 (2007) - [Published | PMID: 17493957]
  34. Bluhm, R.L., Miller, J.E., Lanius, R.A., Osuch, E.A., Boksman, K., Neufeld, R.W.J., Théberge, J., Schaefer, B., & P.C. Williamson. Spontaneous Low Frequency Fluctuations in the BOLD Signal in Schizophrenic Patients: Anomalies in the Default Network. Schizophrenia Bulletin 33: 1004-1012 (2007) - [Published | PMID: 17556752]
  35. Vidal, C., Nicolson, R., DeVito, T., Hayashi, K., Geaga, J., Drost, D., Williamson, P.C., Rajakumar, N., Sui, Y., Dutton, R.A., Toga, A., & P. Thompson. Mapping corpus callosum deficits in autism: an index of aberrant cortical connectivity. Biol Psychiatry 60(3): 218-225 (2006) - [Published | PMID: 16460701]
  36. Nicolson, R., DeVito, T., Vidal, C., Sui, Y., Hayashi, K., Drost, D., Williamson, P.C., Rajakumar, N., Toga, A., & P. Thompson. Detection and mapping of hippocampal abnormalities in autism. Psychiatry Res 148(1): 11-21 (2006) - [Published | PMID: 17056234]
  37. Jensen, J.E., Miller, J.E., Williamson, P.C., Neufeld, R.W.J., Menon, R.S., Malla, A.K., Manchanda, R., Schaefer, B., Densmore, M., & D. Drost. Grey and white matter differences in brain energy metabolism in first episode schizophrenia: 31P-MRS chemical shift imaging at 4 Tesla. Psychiatry Res 146(2): 127-135 (2006) - [Published | PMID: 16497488]
  38. Hendry, J., DeVito, T., Gelman, N., Densmore, M., Rajakumar, N., Pavlosky, W.F., Williamson, P.C., Thompson, P., Drost, D., & R. Nicolson. White matter abnormalities in autism detected through transverse relaxation time imaging. NeuroImage 29(4): 1049-1057 (2006) - [Published | PMID: 16214373]
  39. Lanius, R.A., Williamson, P.C., Bluhm, R.L., Densmore, M., Boksman, K., Neufeld, R.W.J., Gati, J.S., & R.S. Menon. Functional connectivity of dissociative responses in posttraumatic stress disorder: a functional magnetic resonance imaging investigation. Biol Psychiatry 57(8): 873-884 (2005) - [Published | PMID: 15820708]
  40. Théberge, J., Menon, R.S., Williamson, P.C., & D. Drost. Implementation issues of multivoxel STEAM-localized 1H spectroscopy. Magn Reson Med 53(3): 713-718 (2005) - [Published | PMID: 15723387]
  41. DeVito, T., Drost, D., Pavlosky, W.F., Neufeld, R.W.J., Rajakumar, N., McKinlay, B.D., Williamson, P.C., & R. Nicolson. Brain magnetic resonance spectroscopy in Tourette's disorder. J Am Acad Child Adolesc Psychiatry 44(12): 1301-1308 (2005) - [Published | PMID: 16292123]
  42. Boksman, K., Théberge, J., Williamson, P.C., Drost, D., Malla, A.K., Densmore, M., Takhar, J., Pavlosky, W.F., Menon, R.S., & R.W.J. Neufeld. A 4.0-T fMRI study of brain connectivity during word fluency in first-episode schizophrenia. Schizophr Res 75(2-3): 247-263 (2005) - [Published | PMID: 15885517]
  43. Théberge, J., Al-Semaan, Y., Jensen, J.E., Williamson, P.C., Neufeld, R.W.J., Menon, R.S., Schaefer, B., Densmore, M., & D. Drost. Comparative study of proton and phosphorus magnetic resonance spectroscopy in schizophrenia at 4 Tesla. Psychiatry Res 132(1): 33-39 (2004) - [Published | PMID: 15546701]
  44. Théberge, J., Al-Semaan, Y., Drost, D., Malla, A.K., Neufeld, R.W.J., Bartha, R., Manchanda, R., Menon, R.S., Densmore, M., Schaefer, B., & P.C. Williamson. Duration of untreated psychosis vs. N-acetylaspartate and choline in first episode schizophrenia: a 1H magnetic resonance spectroscopy study at 4.0 Tesla. Psychiatry Res 131(2): 107-114 (2004) - [Published | PMID: 15313517]
  45. Jensen, J.E., Miller, J.E., Williamson, P.C., Neufeld, R.W.J., Menon, R.S., Malla, A.K., Manchanda, R., Schaefer, B., Densmore, M., & D. Drost. Focal changes in brain energy and phospholipid metabolism in first-episode schizophrenia: 31P-MRS chemical shift imaging study at 4 Tesla. Br J Psychiatry 184: 409-415 (2004) - [Published | PMID: 15123504]
  46. Lanius, R.A., Williamson, P.C., Densmore, M., Boksman, K., Neufeld, R.W.J., Gati, J.S., & R.S. Menon. The nature of traumatic memories: a 4-T FMRI functional connectivity analysis. Am J Psychiatry 161(1): 36-44 (2004) - [Published | PMID: 14702248]
  47. Théberge, J., Al-Semaan, Y., Williamson, P.C., Menon, R.S., Neufeld, R.W.J., Rajakumar, N., Schaefer, B., Densmore, M., & D. Drost. Glutamate and glutamine in the anterior cingulate and thalamus of medicated patients with chronic schizophrenia and healthy comparison subjects measured with 4.0-T proton MRS. Am J Psychiatry 160(12): 2231-2233 (2003) - [Published | PMID: 14638596]
  48. Sharma, V., Menon, R.S., Carr, T.J., Densmore, M., Mazmanian, D., & P.C. Williamson. An MRI study of subgenual prefrontal cortex in patients with familial and non-familial bipolar I disorder. J Affect Disord 77(2): 167-171 (2003) - [Published | PMID: 14607394]
  49. Lanius, R.A., Williamson, P.C., Hopper, J., Densmore, M., Boksman, K., Gupta, M.A., Neufeld, R.W.J., Gati, J.S., & R.S. Menon. Recall of emotional states in posttraumatic stress disorder: an fMRI investigation. Biol Psychiatry 53(3): 204-210 (2003) - [Published | PMID: 12559652]
  50. Théberge, J., Bartha, R., Drost, D., Menon, R.S., Malla, A.K., Takhar, J., Neufeld, R.W.J., Rogers, J.M., Pavlosky, W.F., Schaefer, B., Densmore, M., Al-Semaan, Y., & P.C. Williamson. Glutamate and glutamine measured with 4.0 T proton MRS in never-treated patients with schizophrenia and healthy volunteers. Am J Psychiatry 159(11): 1944-1946 (2002) - [Published | PMID: 12411236 | Free Access]
  51. Stanley, J.A., Williamson, P.C., Drost, D., Rylett, R.J., Carr, T.J., Malla, A.K., & R.T. Thompson. An in Vivo Proton Magnetic Resonance Spectroscopy Study of Schizophrenia Patients. Schizophrenia Bulletin 22(4): 597-609 (1996) - [Published | PMID: 8938914]
  52. Williamson, P.C., Brauer, M., Leonard, S., Thompson, R.T., & D. Drost. 31P Magnetic resonance spectroscopy studies in schizophrenia. PLEFA 55: 115-008 (1996) - [Published | PMID: 8888133]
  53. Stanley, J.A., Drost, D., Williamson, P.C., & R.T. Thompson. The Use of a Priori Knowledge to Quantify Short Echo in Vivo 1H MR Spectra. Magn Reson Med 34: 17-24 (1995) - [Published | PMID: 7674893]
  54. Stanley, J.A., Williamson, P.C., Drost, D., Carr, T.J., Rylett, R.J., Malla, A.K., & R.T. Thompson. An in Vivo Study of the Prefrontal Cortex of Schizophrenic Patients at Different Stages of Illness via Phosphorus Magnetic Resonance Spectroscopy. Arch Gen Psychiatry 52: 399-406 (1995) - [Published | PMID: 7726721]
  55. Stanley, J.A., Williamson, P.C., Drost, D., Carr, T.J., Rylett, R.J., Morrison-Stewart, S., & R.T. Thompson. Membrane Phospholipid Metabolism and Schizophrenia: an In Vivo 31P MR Spectroscopy Study. Schizophr Res 13: 209-215 (1994) - [Published | PMID: 7841133]
  56. Greening, S., Osuch, E.A., Williamson, P.C., & D.G. Mitchell. "A Dissociation Between Prefrontal Cortex Activation and Emotion Regulation Efficacy in in Unmedicated Major Depression". () - [Submitted]
  57. Greening, S., Osuch, E.A., Williamson, P.C., & D.G. Mitchell. "Attention Modulates Mood Congruent Emotional Deactivity in Depressed Individuals: Reconciling Negative-bias and Emotional Cortex Insensitivity". () - [Submitted]
  58. Williamson, P.C.. "Toward a Final Common Pathway of Depression". Acta Psychiatr Scand () - [In Press]

Proceedings Articles

  1. Penner, J., Ford, K.A., Wammes, M., Neufeld, R.W.J., Mitchell, D.G., Théberge, J., Williamson, P.C., & E.A. Osuch. Neural circuitry underlying major depression and marijuana use: an emotion regulation fMRI task shows activation differences in dorsolateral and ventrolateral prefrontal cortex. (2015) - [Published]
  2. Gagnon, Y., Rajakumar, N., Gelman, N., Williamson, P.C., Drost, D., Théberge, J., & R. Nicolson. Investigating white matter abnormalities in autism using voxel-based relaxometry and voxel-based morphometry. (2010) - [Published]

Book Chapters

  1. Williamson, P.C., & D. Drost. Phospholipid Spectrum Disorder in Psychiatry and Neurology, Second Edition. Peet, M.; Glen, I. and Horrobin, D.F. ed., (2003)
  2. Williamson, P.C., & D. Drost. Phospholipid Spectrum Disorder in Psychiatry. Peet, M.; Glen, I. and Horrobin, D.F. ed., (1999)
  3. Neufeld, R.W.J., & P.C. Williamson. Schizophrenia: A Neuropsychological Approach. Pantelis, C.; Nelson, H.E. and Barnes T.R.E. ed., ()
  4. Taylor, R., Théberge, J., Williamson, P.C., Densmore, M., & R.W.J. Neufeld. Systems Factorial Technology - Model-driven Cognitive Neuroscience of Deviations in Stroop Performance in Schizophrenia. ()

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