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Seppo P. Ahlfors, Ph.D.

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Research
The research activities and funding listed below are automatically derived from NIH ExPORTER and other sources, which might result in incorrect or missing items. Faculty can login to make corrections and additions.
  1. R01DC016765 (AHVENINEN, JYRKI) Jul 1, 2018 - Jun 30, 2023
    NIH/NIDCD
    Non-invasive measures of multisensory cortical feedforward and feedback influences
    Role: Co-Principal Investigator
  2. R01DC015455 (GOW, DAVID W) Apr 1, 2017 - Mar 31, 2022
    NIH/NIDCD
    Identifying the neural structures and dynamics that regulate phonological structure
    Role: Co-Principal Investigator
  3. R01NS057500 (AHLFORS, SEPPO PENTTI) Jul 1, 2007 - Jun 30, 2010
    NIH/NINDS
    Inferring Cortical Feed-Forward and Feedback Processes with Human Neuroimaging
    Role: Principal Investigator
  4. R56NS057500 (AHLFORS, SEPPO PENTTI) Dec 1, 2006 - Jun 30, 2012
    NIH/NINDS
    Inferring Cortical Feed-Forward and Feedback Processes with Human Neuroimaging
    Role: Principal Investigator
  5. R56NS037462 (AHLFORS, SEPPO PENTTI) Jul 23, 1998 - Aug 31, 2016
    NIH/NINDS
    Spatiotemporal imaging of human visual system processing
    Role: Principal Investigator

Bibliographic
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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PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
  1. Ahlfors SP, Mody M. Overview of MEG. Organizational Research Methods. 2019; 22(1):95-115.
  2. Tu Y, Park J, Ahlfors SP, Khan S, Egorova N, Lang C, Cao J, Kong J. A neural mechanism of direct and observational conditioning for placebo and nocebo responses. Neuroimage. 2019 01 01; 184:954-963. PMID: 30296557.
    Citations:    Fields:    
  3. Sitnikova TA, Hughes JW, Ahlfors SP, Woolrich MW, Salat DH. Short timescale abnormalities in the states of spontaneous synchrony in the functional neural networks in Alzheimer's disease. Neuroimage Clin. 2018; 20:128-152. PMID: 30094163.
    Citations:    Fields:    Translation:Humans
  4. Gow DW, Ahlfors SP. Tracking reorganization of large-scale effective connectivity in aphasia following right hemisphere stroke. Brain Lang. 2017 07; 170:12-17. PMID: 28364641.
    Citations:    Fields:    Translation:Humans
  5. Ahlfors SP, Mody M. Overview of MEG. Organ Res Methods. 2019 Jan; 22(1):95-115. PMID: 30636863.
    Citations:    
  6. Sun L, Ahlfors SP, Hinrichs H. Removing Cardiac Artefacts in Magnetoencephalography with Resampled Moving Average Subtraction. Brain Topogr. 2016 11; 29(6):783-790. PMID: 27503196.
    Citations: 1     Fields:    Translation:Humans
  7. Meeren HK, Hadjikhani N, Ahlfors SP, Hämäläinen MS, de Gelder B. Early Preferential Responses to Fear Stimuli in Human Right Dorsal Visual Stream--A Meg Study. Sci Rep. 2016 Apr 20; 6:24831. PMID: 27095660.
    Citations: 4     Fields:    Translation:Humans
  8. Ahveninen J, Huang S, Ahlfors SP, Hämäläinen M, Rossi S, Sams M, Jääskeläinen IP. Interacting parallel pathways associate sounds with visual identity in auditory cortices. Neuroimage. 2016 Jan 01; 124(Pt A):858-868. PMID: 26419388.
    Citations: 1     Fields:    Translation:HumansAnimals
  9. Ahlfors SP, Wreh C. Modeling the effect of dendritic input location on MEG and EEG source dipoles. Med Biol Eng Comput. 2015 Sep; 53(9):879-87. PMID: 25863693.
    Citations: 2     Fields:    Translation:HumansCells
  10. Ahlfors SP, Jones SR, Ahveninen J, Hämäläinen MS, Belliveau JW, Bar M. Direction of magnetoencephalography sources associated with feedback and feedforward contributions in a visual object recognition task. Neurosci Lett. 2015 Jan 12; 585:149-54. PMID: 25445356.
    Citations: 2     Fields:    Translation:Humans
  11. Ahlfors, SP. in Magnetoencephalography: From Signals to Dynamic Cortical Networks (S. Supek and C. J. Aine, eds.). MEG and Multimodal Integration. 2014; 183-198. View Publication.
  12. Meeren HK, de Gelder B, Ahlfors SP, Hämäläinen MS, Hadjikhani N. Different cortical dynamics in face and body perception: an MEG study. PLoS One. 2013; 8(9):e71408. PMID: 24039712.
    Citations: 10     Fields:    Translation:Humans
  13. Han J, Mody M, Ahlfors SP. Gamma phase locking modulated by phonological contrast during auditory comprehension in reading disability. Neuroreport. 2012 Oct 03; 23(14):851-6. PMID: 22889887.
    Citations: 3     Fields:    Translation:Humans
  14. Chang WT, Ahlfors SP, Lin FH. Sparse current source estimation for MEG using loose orientation constraints. Hum Brain Mapp. 2013 Sep; 34(9):2190-201. PMID: 22438263.
    Citations: 3     Fields:    Translation:Humans
  15. Ahlfors SP and Hamalainen MS. in Handbook of Neural Activity Measurement (R. Brette and A. Destexhe, eds.). MEG and EEG: source estimation. 2012; 257-286.
  16. 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. PMID: 21946369.
    Citations: 1     Fields:    Translation:Humans
  17. 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. PMID: 21882299.
    Citations: 4     Fields:    Translation:Humans
  18. 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 08; 108(10):4182-7. PMID: 21368107.
    Citations: 39     Fields:    Translation:HumansPHPublic Health
  19. 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. PMID: 20713071.
    Citations: 3     Fields:    Translation:Humans
  20. Ahlfors SP, Han J, Belliveau JW, Hämäläinen MS. Sensitivity of MEG and EEG to source orientation. Brain Topogr. 2010 Sep; 23(3):227-32. PMID: 20640882.
    Citations: 28     Fields:    Translation:Humans
  21. Liu H, Tanaka N, Stufflebeam S, Ahlfors S, Hämäläinen M. Functional Mapping with Simultaneous MEG and EEG. J Vis Exp. 2010 Jun 14; (40). PMID: 20567210.
    Citations: 7     Fields:    Translation:Humans
  22. 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. PMID: 19639553.
    Citations: 39     Fields:    Translation:Humans
  23. 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. PMID: 20006721.
    Citations: 15     Fields:    Translation:Humans
  24. Stufflebeam SM, Tanaka N, Ahlfors SP. Clinical applications of magnetoencephalography. Hum Brain Mapp. 2009 Jun; 30(6):1813-23. PMID: 19378272.
    Citations: 16     Fields:    Translation:Humans
  25. 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. PMID: 18465745.
    Citations: 44     Fields:    Translation:HumansPHPublic Health
  26. Hadjikhani N, Kveraga K, Naik P, Ahlfors SP. Early (M170) activation of face-specific cortex by face-like objects. Neuroreport. 2009 Mar 04; 20(4):403-7. PMID: 19218867.
    Citations: 20     Fields:    Translation:Humans
  27. 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. PMID: 19233235.
    Citations: 13     Fields:    Translation:Humans
  28. Mody M, Wehner DT, Ahlfors SP. Auditory word perception in sentence context in reading-disabled children. Neuroreport. 2008 Oct 29; 19(16):1567-71. PMID: 18815588.
    Citations: 2     Fields:    Translation:HumansCTClinical Trials
  29. 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. PMID: 18946504.
    Citations: 17     Fields:    Translation:Humans
  30. 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. PMID: 18703146.
    Citations: 46     Fields:    Translation:Humans
  31. 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 01; 40(4):1888-901. PMID: 18356082.
    Citations: 2     Fields:    Translation:Humans
  32. Wehner DT, Hämäläinen MS, Mody M, Ahlfors SP. Head movements of children in MEG: quantification, effects on source estimation, and compensation. Neuroimage. 2008 Apr 01; 40(2):541-550. PMID: 18252273.
    Citations: 14     Fields:    Translation:Humans
  33. 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. PMID: 17370341.
    Citations: 8     Fields:    Translation:Humans
  34. 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. PMID: 17899610.
    Citations: 6     Fields:    Translation:Humans
  35. 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. PMID: 17846196.
    Citations: 4     Fields:    Translation:Humans
  36. 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 05; 45(14):3251-62. PMID: 17675109.
    Citations: 8     Fields:    Translation:Humans
  37. 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. PMID: 17538111.
    Citations: 6     Fields:    Translation:Humans
  38. 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. PMID: 16964616.
    Citations: 30     Fields:    Translation:Humans
  39. 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. PMID: 16997580.
    Citations: 32     Fields:    Translation:Humans
  40. 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. PMID: 16520063.
    Citations: 93     Fields:    Translation:HumansCells
  41. 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. PMID: 16516443.
    Citations: 26     Fields:    Translation:Humans
  42. 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. PMID: 16086144.
    Citations: 14     Fields:    Translation:HumansCTClinical Trials
  43. 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. PMID: 16060938.
    Citations: 15     Fields:    Translation:Humans
  44. 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. PMID: 15921240.
    Citations: 9     Fields:    Translation:Humans
  45. 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. PMID: 15670696.
    Citations: 8     Fields:    Translation:HumansCTClinical Trials
  46. Ahlfors S. Biomagnetism in 2004: Introduction. Neurol. Clin. Neurophysiol. 2004; 2004(113):1-2.
  47. Ahlfors SP, Simpson GV. Geometrical interpretation of fMRI-guided MEG/EEG inverse estimates. Neuroimage. 2004 May; 22(1):323-32. PMID: 15110022.
    Citations: 13     Fields:    Translation:Humans
  48. 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. PMID: 10561425.
    Citations: 28     Fields:    Translation:Humans
  49. Foxe JJ, Simpson GV, Ahlfors SP. Parieto-occipital approximately 10 Hz activity reflects anticipatory state of visual attention mechanisms. Neuroreport. 1998 Dec 01; 9(17):3929-33. PMID: 9875731.
    Citations: 114     Fields:    Translation:HumansCTClinical Trials
  50. 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. PMID: 8576389.
    Citations: 6     Fields:    Translation:Humans
  51. 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. PMID: 7851933.
    Citations: 3     Fields:    Translation:Humans
  52. 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. PMID: 7688289.
    Citations: 1     Fields:    Translation:Humans
  53. 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. PMID: 1371437.
    Citations: 7     Fields:    Translation:Humans
  54. Ahlfors SP, Ilmoniemi RJ, Hämäläinen MS. Estimates of visually evoked cortical currents. Electroencephalogr Clin Neurophysiol. 1992 Mar; 82(3):225-36. PMID: 1371444.
    Citations: 10     Fields:    Translation:Humans
  55. 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. PMID: 1745412.
    Citations: 16     Fields:    Translation:Humans
  56. 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 04; 82(3):303-7. PMID: 3696502.
    Citations: 15     Fields:    Translation:Humans
  57. 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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Funded by the NIH/NCATS Clinical and Translational Science Award (CTSA) program, grant number UL1TR001102, and through institutional support from Harvard University, Harvard Medical School, Harvard T.H. Chan School of Public Health, Beth Israel Deaconess Medical Center, Boston Children's Hospital, Brigham and Women's Hospital, Massachusetts General Hospital and the Dana Farber Cancer Institute.