Seed-based d Mapping (formerly "Signed Differential Mapping") is a statistical technique for meta-analyzing studies on differences in brain activity or structure which used neuroimaging techniques such as fMRI, VBM, DTI or PET. The methods have been fully validated in several studies (see references below), and meta-analyses using this method have been already published at the highest quality journals, such as Archives of General Psychiatry / JAMA Psychiatry , the American Journal of Psychiatry , Neuroscience & Biobehavioral Reviews , Biological Psychiatry , Schizophrenia Bulletin , Current Opinion in Neurobiology , Neuropsychopharmacology , the British Journal of Psychiatry , Neuroimage , Human Brain Mapping , Social Cognitive and Affective Neuroscience , Radiology , Journal of Psychiatry & Neuroscience or Psychological Medicine .
An introduction of the method can be found in the SDM Reference Manual.
Briefly, some of the features are:
- Possibility of combining studies from which only peak coordinates are available with studies from which SPM t-maps are available, highly increase the power of the meta-analysis.
- Use of specific masks correlation templates for fMRI, PET, gray matter, white matter, fractional anisotropy, TBSS and cerebrospinal fluid to account for the anisotropy in the spatial covariance of the brain, highly increasing the accuracy of the recreation of the effect size maps.
- Accounting for peaks' effect-size and signed maps to counteract positive and negative differences.
- Weighting the calculations for intra-study variance (i.e. studies with large sample sizes and/or lower error contribute more), inter-study heterogeneity and other optional weights.
- Use of the random-effects general linear models to allow meta-analytical comparisons between groups, meta-regressions and use of covariates.
- Complementary analyses such as exploration of heterogeneity (by means of heterogeneity maps, subgroup analyses and meta-regressions) and jackknife analyses (to assess the replicability of the results).
Please feel free to download the software created by the SDM Project to carry out such meta-analyses.
Introduction to voxel-based meta-analyses:
- Radua J and Mataix-Cols D. Meta-analytic methods for neuroimaging data explained. Biol Mood Anxiety Disord 2012; 2:6.
- Radua J and Mataix-Cols D. Voxel-wise meta-analysis of grey matter changes in obsessive-compulsive disorder. Br J Psychiatry 2009; 195:393-402.
- Radua J, van den Heuvel OA, Surguladze S and Mataix-Cols D. Meta-analytical comparison of voxel-based morphometry studies in obsessive compulsive disorder vs other anxiety disorders. Arch Gen Psychiatry 2010; 67:701-711.
- Radua J, Mataix-Cols D, Phillips ML, El-Hage W, Kronhaus DM, Cardoner N and Surguladze S. A new meta-analytic method for neuroimaging studies that combines reported peak coordinates and statistical parametric maps. Eur Psychiatry 2012; 27:605–611.
- Radua J, Rubia K, Canales-Rodriguez EJ, Pomarol-Clotet E, Fusar-Poli P and Mataix-Cols D. Anisotropic kernels for coordinate-based meta-analyses of neuroimaging studies. Front Psychiatry 2014; 5:13.
SDM specific white matter and TBSS templates:
- Radua J, Via E, Catani M and Mataix-Cols D. Voxel-based meta-analysis of regional white-matter volume differences in autism spectrum disorder versus healthy controls. Psychol Med 2011; 41:1539-1550.
- Peters BD, Szeszko PR, Radua J, Ikuta T, Gruner P, DeRosse P, Zhang JP, Giorgio A, Qiu D, Tapert SF, Brauer J, Asato MR, Khong PL, James AC, Gallego JA and Malhotra AK. White matter development in adolescence: diffusion tensor imaging and meta-analytic results. Schizophrenia Bull 2012; 38:1308-1317.
- Radua J, Romeo M, Mataix-Cols D and Fusar-Poli P. A general approach for combining voxel-based meta-analyses conducted in different neuroimaging modalities. Curr Med Chem 2013; 20:462-466.
- Radua J, Grau M, van den Heuvel OA, de Schotten MT, Stein DJ, Canales-Rodriguez EJ, Catani M and Mataix-Cols D. Multimodal voxel-based meta-analysis of white matter abnormalities in obsessive-compulsive disorder. Neuropsychopharmacology 2014; 39:1547-57.
- Thiebaut de Schotten M, Dell'Acqua F, Forkel SJ, Simmons A, Vergani F, Murphy DG and Catani M. A lateralized brain network for visuospatial attention. Nat Neurosci 2011; 14:1245-1246.
- Thiebaut de Schotten M, Ffytche DH, Bizzi A, Dell'Acqua F, Allin M, Walshe M, Murray R, Williams SC, Murphy DG and Catani M. Atlasing location, asymmetry and inter-subject variability of white matter tracts in the human brain with MR diffusion tractography. Neuroimage 2011; 54:49-59.
Other known studies using SDM (probably not all of them):
- Bora E, Fornito A, Yücel M and Pantelis C. Voxelwise meta-analysis of gray matter abnormalities in bipolar disorder. Biol Psychiatry 2010; 67:1097-1105.
- Chen Z and Ma L. Grey matter volume changes over the whole brain in amyotrophic lateral sclerosis: A voxel-wise meta-analysis of voxel based morphometry studies. Amyotroph Lateral Scler 2010; 11:549-554.
- Bora E, Fornito A, Radua J, Walterfang M, Seal M, Wood SJ, Yücel M, Velakoulis D and Pantelis C. Neuroanatomical abnormalities in schizophrenia: A multimodal voxelwise meta-analysis and meta-regression analysis. Schizophr Res 2011; 127:46-57.
- Richlan F, Kronbichler M and Wimmer H. Meta-analyzing brain dysfunctions in dyslexic children and adults. Neuroimage 2011; 56:1735-42.
- E Via, J Radua, N Cardoner, F Happe and D Mataix-Cols. Meta-analysis of gray matter abnormalities in autism spectrum disorder: should Asperger disorder be subsumed under a broader umbrella of autistic spectrum disorder? Arch Gen Psychiatry 2011; 68:409-418.
- Lai CH. Gray matter deficits in panic disorder: a pilot study of meta-analysis. J Clin Psychopharmacol 2011; 31:287-93.
- Bora E, Fornito A, Pantelis C and Yücel M. Gray matter abnormalities in Major Depressive Disorder: A meta-analysis of voxel based morphometry studies. J Affect Disord 2012; 138:9-18.
- Li J, Pan P, Song W, Huang R, Chen K and Shang H. A meta-analysis of diffusion tensor imaging studies in amyotrophic lateral sclerosis. Neurobiol Aging 2012; 33:1833–1838.
- Pan PL, Song W and Shang HF. Voxel-wise meta-analysis of gray matter abnormalities in idiopathic Parkinson's disease. Eur J Neurol 2011; 19:199-206.
- Bora E, Fornito A, Yücel M and Pantelis C. The effects of gender on grey matter abnormalities in major psychoses: a comparative voxelwise meta-analysis of schizophrenia and bipolar disorder. Psychol Med 2011; 42:295-307.
- Nakao T, Radua J, Rubia K and Mataix-Cols D. Gray matter volume abnormalities in ADHD: Voxel-based meta-analysis exploring the effects of age and stimulant medication. Am J Psychiatry 2011; 168:1154-1163.
- Murphy ML and Frodl T. Meta-analysis of diffusion tensor imaging studies shows altered fractional anisotropy occurring in distinct brain areas in association with depression. Biol Mood Anxiety Disord 2011; 1:3.
- Fusar-Poli P, Radua J, McGuire P and Stefan B. Neuroanatomical maps of psychosis onset: Voxel-wise meta-analysis of antipsychotic-naive VBM studies. Schizophrenia Bull 2012; 38:1297-1307.
- Frodl T and Skokauskas N. Meta-analysis of structural MRI studies in children and adults with attention deficit hyperactivity disorder indicates treatment effects. Acta Psychiatr Scand 2012; 125:114-26.
- Fusar-Poli P. Voxel-wise meta-analysis of fMRI studies in patients at clinical high risk for psychosis. J Psychiatry Neurosci 2012;37:106-12.
- Li J, Pan P, Huang R and Shang H. A meta-analysis of voxel-based morphometry studies of white matter volume alterations in Alzheimer's disease. Neurosci Biobehav R 2012;36:757-63.
- Fusar-Poli P, Smieskova R, Serafini G, Politi P and Borgwardt S. Neuroanatomical markers of genetic liability to psychosis and first episode psychosis: A voxelwise meta-analytical comparison. World J Biol Psychia 2014;15:219-28.
- Palaniyappan L, Balain V, Radua J and Liddle PF. Structural correlates of auditory hallucinations in schizophrenia: A meta-analysis. Schizophr Res 2012; 137:169–173.
- Richlan F, Kronbichler M and Wimmer H. Structural abnormalities in the dyslexic brain: A meta-analysis of voxel-based morphometry studies. Hum Brain Mapp 2012; 34:3055-65.
- Pan PL, Song W, Yang J, Huang R, Chen K, Gong QY, Zhong JG, Shi HC and Shang HF. Gray matter atrophy in behavioral variant frontotemporal dementia: a meta-analysis of voxel-based morphometry studies. Dement Geriatr Cogn Disord 2012; 33:141-8.
- Palaniyappan L, Balain V and Liddle PF. The neuroanatomy of psychotic diathesis: A meta-analytic review. J Psychiatr Res 2012; 46:1249–1256.
- Bohrn IC, Altmann U and Jacobs AM. Looking at the brains behind figurative language - A quantitative meta-analysis of neuroimaging studies on metaphor, idiom, and irony processing. Neuropsychologia 2012; 50:2669–2683.
- Radua J, Borgwardt S, Crescini A, Mataix-Cols D, Meyer-Lindenberg A, McGuire PK and Fusar-Poli P. Multimodal meta-analysis of structural and functional brain changes in first episode psychosis and the effects of antipsychotic medication. Neurosci Biobehav Rev 2012; 36:2325–2333.
- Hart H, Radua J, Mataix-Cols D and Rubia K. Meta-analysis of fMRI studies of timing in attention-deficit hyperactivity disorder (ADHD). Neurosci Biobehav Rev 2012; 36:2248-56.
- Lai CH. Gray matter volume in major depressive disorder: a meta-analysis of voxel-based morphometry studies. Psychiatry Res 2013; 211:37-46.
- Peng Z, Lui SS, Cheung EF, Jin Z, Miao G, Jing J and Chan RC. Brain structural abnormalities in obsessive-compulsive disorder: converging evidence from white matter and grey matter. Asian J Psychiatr 2012; 5:290-296.
- Pan PL, Shi HC, Zhong JG, Xiao PR, Shen Y, Wu LJ, Song YY, He GX and Li HL. Gray matter atrophy in Parkinson's disease with dementia: evidence from meta-analysis of voxel-based morphometry studies. Neurol Sci 2013; 34:613-619.
- Pan P, Shi H, Zhong J, Xiao P, Shen Y, Wu L, Song Y and He G. Chronic smoking and brain gray matter changes: evidence from meta-analysis of voxel-based morphometry studies. Neurol Sci 2012; 34:813-7.
- Hart H, Radua J, Nakao T, Mataix-Cols D and Rubia K. Meta-analysis of functional magnetic resonance imaging studies of inhibition and attention in attention-deficit/hyperactivity disorder: exploring task-specific, stimulant medication, and age effects. JAMA Psychiatry 2013; 70:185-98.
- Lansley J, Mataix-Cols D, Grau M, Radua J and Sastre-Garriga J. Localized grey matter atrophy in multiple sclerosis: A meta-analysis of voxel-based morphometry studies and associations with functional disability. Neurosci Biobehav Rev 2013; 37:819-830.
- Ersche KD, Williams GB, Robbins TW and Bullmore ET. Meta-analysis of structural brain abnormalities associated with stimulant drug dependence and neuroimaging of addiction vulnerability and resilience. Curr Opin Neurobiol 2013; 23:615-24.
- Jacobs HI, Radua J, Lückmann HC and Sack AT. Meta-analysis of functional network alterations in Alzheimer's disease: Toward a network biomarker. Neurosci Biobehav Rev 2013; 37:753-765.
- Sartory G, Cwik J, Knuppertz H, Schürholt B, Lebens M, Seitz RJ and Schulze R. In search of the trauma memory: a meta-analysis of functional neuroimaging studies of symptom provocation in posttraumatic stress disorder (PTSD). PLoS One 2013; 8:e58150.
- Shi HC, Zhong JG, Pan PL, Xiao PR, Shen Y, Wu LJ, Li HL, Song YY, He GX and Li HY. Gray matter atrophy in progressive supranuclear palsy: meta-analysis of voxel-based morphometry studies. Neurol Sci 2013; 34:1049-55.
- McCarthy H, Skokauskas N and Frodl T. Identifying a consistent pattern of neural function in attention deficit hyperactivity disorder: a meta-analysis. Psychol Med 2013; 44:869-80.
- Alves J, Soares JM, Sampaio A and Gonçalves OF. Posterior cortical atrophy and Alzheimer's disease: a meta-analytic review of neuropsychological and brain morphometry studies. Brain Imaging Behav 2013;7:353-61.
- Nortje G, Stein DJ, Radua J, Mataix-Cols D and Horn N. Systematic review and voxel-based meta-analysis of diffusion tensor imaging studies in bipolar disorder. J Affect Disord 2013;150:192-200.
- Aoki Y, Inokuchi R, Nakao T and Yamasue H. Neural bases of antisocial behavior: a voxel-based meta-analysis. Soc Cogn Affect Neurosci 2014;9:1223-31.
- Cao B, Tang Y, Li J, Zhang X, Shang HF and Zhou D. A meta-analysis of voxel-based morphometry studies on gray matter volume alteration in juvenile myoclonic epilepsy. Epilepsy Res 2013; 106:370-7.
- Hajek T, Alda M, Hajek E and Ivanoff J. Functional neuroanatomy of response inhibition in bipolar disorders - Combined voxel based and cognitive performance meta-analysis. J Psychiatr Res 2013; 47:1955-66.
- Schurz M, Aichhorn M, Martin A and Perner J. Common brain areas engaged in false belief reasoning and visual perspective taking: a meta-analysis of functional brain imaging studies. Front Hum Neurosci 2013;7:712.
- Lin CS, Niddam DM and Hsu ML. Meta-analysis on brain representation of experimental dental pain. J Dent Res 2014; 93:126-33.
- Cooper D, Barker V, Radua J, Fusar-Poli P and Lawrie SM. Multimodal voxel-based meta-analysis of structural and functional magnetic resonance imaging studies in those at elevated genetic risk of developing schizophrenia. Psychiatry Res 2014; 221:69-77.
- Rubia K, Alegria AA, Cubillo AI, Smith AB, Brammer MJ and Radua J. Effects of stimulants on brain function in attention-deficit/hyperactivity disorder: a systematic review and meta-analysis. Biol Psychiatry 2014;76:616-28.
- Xiao Y, Zhang W, Lui S, Yao L and Gong Q. Similar and different gray matter deficits in schizophrenia patients and their unaffected biological relatives. Front Psychiatry 2013; 4:150.
- White TP, Engen NH, Sorensen S, Overgaard M and Shergill SS. Uncertainty and confidence from the triple-network perspective: voxel-based meta-analyses.. Brain Cogn 2014; 85C:191-200.
- Schurz M, Radua J, Aichhorn M, Richlan F and Perner J. Fractionating Theory of Mind: a meta-analysis of functional brain imaging studies. Neurosci Biobehav Rev 2014;42:9-34.
- Shang J, Fu Y, Ren Z, Zhang T, Du M, Gong Q, Lui S and Zhang W. The common traits of the ACC and PFC in anxiety disorders in the DSM-5: meta-analysis of voxel-based morphometry studies. PLoS One 2014;9:e93432.
- Goozee R, Handley R, Kempton MJ and Dazzan P. A systematic review and meta-analysis of the effects of antipsychotic medications on regional cerebral blood flow (rCBF) in schizophrenia: association with response to treatment. Neurosci Biobehav Rev 2014;43:118-36.
- Radua J, Del Pozo NO, Gómez J, Guillen-Grima F and Ortuño F. Meta-analysis of functional neuroimaging studies indicates that an increase of cognitive difficulty during executive tasks engages brain regions associated with time perception. Neuropsychologia 2014;58:14-22.
- Rocchetti M, Radua J, Paloyelis Y, Xenaki LA, Frascarelli M, Caverzasi E, Politi P and Fusar-Poli P. Neurofunctional maps of the 'maternal brain' and the effects of oxytocin: a multimodal voxel-based meta-analysis. Psychiatry Clin Neurosci 2014;68:733-51.
- Lim L, Radua J and Rubia K. Gray matter abnormalities in childhood maltreatment: a voxel-wise meta-analysis. Am J Psychiatry 2014;171:854-63.
- Liu Y, Yu JT, Wang HF, Han PR, Tan CC, Wang C, Meng XF, Risacher SL, Saykin AJ and Tan L. APOE genotype and neuroimaging markers of Alzheimer's disease: systematic review and meta-analysis. J Neurol Neurosurg Psychiatry 2014; in Press.
- Meng Y, Qiu C, Zhu H, Lama S, Lui S, Gong Q and Zhang W. Anatomical deficits in adult posttraumatic stress disorder: a meta-analysis of voxel-based morphometry studies. Behav Brain Res 2014;270:307-15.
- Meng Y1, Deng W, Wang H, Guo W and Li T. The prefrontal dysfunction in individuals with Internet gaming disorder: a meta-analysis of functional magnetic resonance imaging studies. Addict Biol 2014; in Press.
- Lisofsky N, Kazzer P, Heekeren HR and Prehn K. Investigating socio-cognitive processes in deception: a quantitative meta-analysis of neuroimaging studies. Neuropsychologia 2014; 2014;61:113-22.
- Du M, Liu J, Chen Z, Huang X, Li J, Kuang W, Yang Y, Zhang W, Zhou D, Bi F, Kendrick KM and Gong Q. Brain grey matter volume alterations in late-life depression. J Psychiatry Neurosci 2014;39:397-406.
- Scognamiglio C and Houenou J. A meta-analysis of fMRI studies in healthy relatives of patients with schizophrenia. Aust N Z J Psychiatry 2014;48:907-16.
- Zhong J, Pan P, Dai Z and Shi H. Voxelwise meta-analysis of gray matter abnormalities in dementia with Lewy bodies. Eur J Radiol 2014;83:1870-4.
- Zhao YJ, Du MY, Huang XQ, Lui S, Chen ZQ, Liu J, Luo Y, Wang XL, Kemp GJ and Gong QY. Brain grey matter abnormalities in medication-free patients with major depressive disorder: a meta-analysis. Psychol Med 2014;44:2927-37.
- Wang XL, Du MY, Chen TL, Chen ZQ, Huang XQ, Luo Y, Zhao YJ, Kumar P and Gong QY. Neural correlates during working memory processing in major depressive disorder. Prog Neuropsychopharmacol Biol Psychiatry 2015:56:101–108.
- Meng YJ, Deng W, Wang HY, Guo WJ, Li T, Lam C and Lin X. Reward pathway dysfunction in gambling disorder: A meta-analysis of functional magnetic resonance imaging studies. Behav Brain Res 2014;275C:243-251.
- Aoki Y, Cortese S and Tansella M. Neural bases of atypical emotional face processing in autism: A meta-analysis of fMRI studies. World J Biol Psychiatry 2014; in Press.
- He W, Liu D, Radua J, Li G, Han B and Sun Z. Meta-analytic comparison between PIB-PET and FDG-PET results in Alzheimer's Disease and MCI. Cell Biochem Biophys 2015;71:17-26.
- Welton T, Kent D, Constantinescu CS, Auer DP and Dineen RA. Functionally relevant white matter degradation in multiple sclerosis: A tract-based spatial meta-analysis. Radiology 2014; in Press.
- Gabay AS, Radua J, Kempton MJ and Mehta MA. The Ultimatum Game and the brain: A meta-analysis of neuroimaging studies. Neurosci Biobehav Rev 2014;47C:549-558.
Do you know other published studies using SDM? Please tell us at joaquim dot radua at kcl dot ac dot uk !