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Seppo P. Ahlfors, PH.D.

TitleAssistant Professor of Radiology
InstitutionMassachusetts General Hospital
DepartmentRadiology
AddressMassachusetts General Hospital
Rm. 2301/Radiology/NMR Ctr.
149 13th Street
Charlestown MA 02129
Other Positions
TitleMember of the Affiliated Faculty of the Harvard-MIT Division of Health Sciences and Technology
InstitutionMassachusetts Institute of Technology
DepartmentHealth Sciences and Technology


 Bibliographic 
 selected publications
Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Faculty can login to make corrections and additions.
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  1. Han J, Mody M, Ahlfors SP. Gamma phase locking modulated by phonological contrast during auditory comprehension in reading disability. Neuroreport. 2012 Oct 3; 23(14):851-6.
    View in: PubMed
  2. Chang WT, Ahlfors SP, Lin FH. Sparse current source estimation for MEG using loose orientation constraints. Hum Brain Mapp. 2012 Mar 22.
    View in: PubMed
  3. Shiraishi H, Ahlfors SP, Stufflebeam SM, Knake S, Larsson PG, Hämäläinen MS, Takano K, Okajima M, Hatanaka K, Saitoh S, Dale AM, Halgren E. Comparison of three methods for localizing interictal epileptiform discharges with magnetoencephalography. J Clin Neurophysiol. 2011 Oct; 28(5):431-40.
    View in: PubMed
  4. Ciesielski KT, Rauch SL, Ahlfors SP, Vangel ME, Wilhelm S, Rosen BR, Hämäläinen MS. Role of medial cortical networks for anticipatory processing in obsessive-compulsive disorder. Hum Brain Mapp. 2012 Sep; 33(9):2125-34.
    View in: PubMed
  5. Ahveninen J, Hämäläinen M, Jääskeläinen IP, Ahlfors SP, Huang S, Lin FH, Raij T, Sams M, Vasios CE, Belliveau JW. Attention-driven auditory cortex short-term plasticity helps segregate relevant sounds from noise. Proc Natl Acad Sci U S A. 2011 Mar 8; 108(10):4182-7.
    View in: PubMed
  6. Ciesielski KT, Ahlfors SP, Bedrick EJ, Kerwin AA, Hämäläinen MS. Top-down control of MEG alpha-band activity in children performing Categorical N-Back Task. Neuropsychologia. 2010 Oct; 48(12):3573-9.
    View in: PubMed
  7. Ahlfors SP, Han J, Belliveau JW, Hämäläinen MS. Sensitivity of MEG and EEG to source orientation. Brain Topogr. 2010 Sep; 23(3):227-32.
    View in: PubMed
  8. Liu H, Tanaka N, Stufflebeam S, Ahlfors S, Hämäläinen M. Functional Mapping with Simultaneous MEG and EEG. J Vis Exp. 2010; (40).
    View in: PubMed
  9. Ahlfors SP, Han J, Lin FH, Witzel T, Belliveau JW, Hämäläinen MS, Halgren E. Cancellation of EEG and MEG signals generated by extended and distributed sources. Hum Brain Mapp. 2010 Jan; 31(1):140-9.
    View in: PubMed
  10. Tanaka N, Hämäläinen MS, Ahlfors SP, Liu H, Madsen JR, Bourgeois BF, Lee JW, Dworetzky BA, Belliveau JW, Stufflebeam SM. Propagation of epileptic spikes reconstructed from spatiotemporal magnetoencephalographic and electroencephalographic source analysis. Neuroimage. 2010 Mar; 50(1):217-22.
    View in: PubMed
  11. Stufflebeam SM, Tanaka N, Ahlfors SP. Clinical applications of magnetoencephalography. Hum Brain Mapp. 2009 Jun; 30(6):1813-23.
    View in: PubMed
  12. Goldenholz DM, Ahlfors SP, Hämäläinen MS, Sharon D, Ishitobi M, Vaina LM, Stufflebeam SM. Mapping the signal-to-noise-ratios of cortical sources in magnetoencephalography and electroencephalography. Hum Brain Mapp. 2009 Apr; 30(4):1077-86.
    View in: PubMed
  13. Hadjikhani N, Kveraga K, Naik P, Ahlfors SP. Early (M170) activation of face-specific cortex by face-like objects. Neuroreport. 2009 Mar 4; 20(4):403-7.
    View in: PubMed
  14. Freeman WJ, Ahlfors SP, Menon V. Combining fMRI with EEG and MEG in order to relate patterns of brain activity to cognition. Int J Psychophysiol. 2009 Jul; 73(1):43-52.
    View in: PubMed
  15. Mody M, Wehner DT, Ahlfors SP. Auditory word perception in sentence context in reading-disabled children. Neuroreport. 2008 Oct 29; 19(16):1567-71.
    View in: PubMed
  16. Meeren HK, Hadjikhani N, Ahlfors SP, Hämäläinen MS, de Gelder B. Early category-specific cortical activation revealed by visual stimulus inversion. PLoS One. 2008; 3(10):e3503.
    View in: PubMed
  17. Gow DW, Segawa JA, Ahlfors SP, Lin FH. Lexical influences on speech perception: a Granger causality analysis of MEG and EEG source estimates. Neuroimage. 2008 Nov 15; 43(3):614-23.
    View in: PubMed
  18. Frye RE, Fisher JM, Witzel T, Ahlfors SP, Swank P, Liederman J, Halgren E. Objective phonological and subjective perceptual characteristics of syllables modulate spatiotemporal patterns of superior temporal gyrus activity. Neuroimage. 2008 May 1; 40(4):1888-901.
    View in: PubMed
  19. Wehner DT, Hämäläinen MS, Mody M, Ahlfors SP. Head movements of children in MEG: quantification, effects on source estimation, and compensation. Neuroimage. 2008 Apr 1; 40(2):541-50.
    View in: PubMed
  20. Ciesielski KT, Hämäläinen MS, Geller DA, Wilhelm S, Goldsmith TE, Ahlfors SP. Dissociation between MEG alpha modulation and performance accuracy on visual working memory task in obsessive compulsive disorder. Hum Brain Mapp. 2007 Dec; 28(12):1401-14.
    View in: PubMed
  21. Lin FH, Wang FN, Ahlfors SP, Hämäläinen MS, Belliveau JW. Parallel MRI reconstruction using variance partitioning regularization. Magn Reson Med. 2007 Oct; 58(4):735-44.
    View in: PubMed
  22. Hara K, Lin FH, Camposano S, Foxe DM, Grant PE, Bourgeois BF, Ahlfors SP, Stufflebeam SM. Magnetoencephalographic mapping of interictal spike propagation: a technical and clinical report. AJNR Am J Neuroradiol. 2007 Sep; 28(8):1486-8.
    View in: PubMed
  23. Wehner DT, Ahlfors SP, Mody M. Effects of phonological contrast on auditory word discrimination in children with and without reading disability: a magnetoencephalography (MEG) study. Neuropsychologia. 2007 Nov 5; 45(14):3251-62.
    View in: PubMed
  24. Wehner DT, Ahlfors SP, Mody M. The influence of semantic processing on phonological decisions in children and adults: a magnetoencephalography (MEG) study. J Speech Lang Hear Res. 2007 Jun; 50(3):716-31.
    View in: PubMed
  25. Lin FH, Wald LL, Ahlfors SP, Hämäläinen MS, Kwong KK, Belliveau JW. Dynamic magnetic resonance inverse imaging of human brain function. Magn Reson Med. 2006 Oct; 56(4):787-802.
    View in: PubMed
  26. Ciesielski KT, Lesnik PG, Savoy RL, Grant EP, Ahlfors SP. Developmental neural networks in children performing a Categorical N-Back Task. Neuroimage. 2006 Nov 15; 33(3):980-90.
    View in: PubMed
  27. Lin FH, Witzel T, Ahlfors SP, Stufflebeam SM, Belliveau JW, Hämäläinen MS. Assessing and improving the spatial accuracy in MEG source localization by depth-weighted minimum-norm estimates. Neuroimage. 2006 May 15; 31(1):160-71.
    View in: PubMed
  28. Knake S, Halgren E, Shiraishi H, Hara K, Hamer HM, Grant PE, Carr VA, Foxe D, Camposano S, Busa E, Witzel T, Hämäläinen MS, Ahlfors SP, Bromfield EB, Black PM, Bourgeois BF, Cole AJ, Cosgrove GR, Dworetzky BA, Madsen JR, Larsson PG, Schomer DL, Thiele EA, Dale AM, Rosen BR, Stufflebeam SM. The value of multichannel MEG and EEG in the presurgical evaluation of 70 epilepsy patients. Epilepsy Res. 2006 Apr; 69(1):80-6.
    View in: PubMed
  29. Foxe JJ, Simpson GV, Ahlfors SP, Saron CD. Biasing the brain's attentional set: I. cue driven deployments of intersensory selective attention. Exp Brain Res. 2005 Oct; 166(3-4):370-92.
    View in: PubMed
  30. Shiraishi H, Ahlfors SP, Stufflebeam SM, Takano K, Okajima M, Knake S, Hatanaka K, Kohsaka S, Saitoh S, Dale AM, Halgren E. Application of magnetoencephalography in epilepsy patients with widespread spike or slow-wave activity. Epilepsia. 2005 Aug; 46(8):1264-72.
    View in: PubMed
  31. Shiraishi H, Stufflebeam SM, Knake S, Ahlfors SP, Sudo A, Asahina N, Egawa K, Hatanaka K, Kohsaka S, Saitoh S, Grant PE, Dale AM, Halgren E. Dynamic statistical parametric mapping for analyzing the magnetoencephalographic epileptiform activity in patients with epilepsy. J Child Neurol. 2005 Apr; 20(4):363-9.
    View in: PubMed
  32. Ciesielski KT, Hämäläinen MS, Lesnik PG, Geller DA, Ahlfors SP. Increased MEG activation in OCD reflects a compensatory mechanism specific to the phase of a visual working memory task. Neuroimage. 2005 Feb 15; 24(4):1180-91.
    View in: PubMed
  33. Ahlfors S. Biomagnetism in 2004: Introduction. Neurol. Clin. Neurophysiol. 2004; 2004(113):1-2.
  34. Ahlfors SP, Simpson GV. Geometrical interpretation of fMRI-guided MEG/EEG inverse estimates. Neuroimage. 2004 May; 22(1):323-32.
    View in: PubMed
  35. Ahlfors SP, Simpson GV, Dale AM, Belliveau JW, Liu AK, Korvenoja A, Virtanen J, Huotilainen M, Tootell RB, Aronen HJ, Ilmoniemi RJ. Spatiotemporal activity of a cortical network for processing visual motion revealed by MEG and fMRI. J Neurophysiol. 1999 Nov; 82(5):2545-55.
    View in: PubMed
  36. Foxe JJ, Simpson GV, Ahlfors SP. Parieto-occipital approximately 10 Hz activity reflects anticipatory state of visual attention mechanisms. Neuroreport. 1998 Dec 1; 9(17):3929-33.
    View in: PubMed
  37. Simpson GV, Pflieger ME, Foxe JJ, Ahlfors SP, Vaughan HG, Hrabe J, Ilmoniemi RJ, Lantos G. Dynamic neuroimaging of brain function. J Clin Neurophysiol. 1995 Sep; 12(5):432-49.
    View in: PubMed
  38. Numminen J, Ahlfors S, Ilmoniemi R, Montonen J, Nenonen J. Transformation of multichannel magnetocardiographic signals to standard grid form. IEEE Trans Biomed Eng. 1995 Jan; 42(1):72-8.
    View in: PubMed
  39. Ahlfors SP, Ilmoniemi RJ, Portin K. The effect of stimulation rate on the signal-to-noise ratio of evoked responses. Electroencephalogr Clin Neurophysiol. 1993 Jul-Aug; 88(4):339-42.
    View in: PubMed
  40. Huttunen J, Ahlfors S, Hari R. Interaction of afferent impulses in the human primary sensorimotor cortex. Electroencephalogr Clin Neurophysiol. 1992 Mar; 82(3):176-81.
    View in: PubMed
  41. Ahlfors SP, Ilmoniemi RJ, Hämäläinen MS. Estimates of visually evoked cortical currents. Electroencephalogr Clin Neurophysiol. 1992 Mar; 82(3):225-36.
    View in: PubMed
  42. Tiihonen J, Hari R, Kajola M, Karhu J, Ahlfors S, Tissari S. Magnetoencephalographic 10-Hz rhythm from the human auditory cortex. Neurosci Lett. 1991 Aug 19; 129(2):303-5.
    View in: PubMed
  43. Pelizzone M, Hari R, Mäkelä JP, Huttunen J, Ahlfors S, Hämäläinen M. Cortical origin of middle-latency auditory evoked responses in man. Neurosci Lett. 1987 Dec 4; 82(3):303-7.
    View in: PubMed
  44. Knuutila J, Ahlfors S, Ahonen A, Hällström J, Kajola M, Lounasmaa OV, Tesche C, Vilkman V. Rev Sci Instrum. Large-area low-noise seven-channel dc SQUID magnetometer for brain research. 1987; 58(11):2145-2156.
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