Behavioural and neurophysiological responses to written naming treatment and high definition tDCS: a case study in advanced primary progressive aphasia

References

• Alam, M., Truong, D. Q., Khadka, N., & Bikson, M. (2016). Spatial and polarity precision of concentric high-definition transcranial direct current stimulation (HD-tDCS). Physics in Medicine and Biology, 61(12), 4506–4521. https://doi.org/10.1088/0031-9155/61/12/4506
   PubMed Web of Science ®Google Scholar
• Amici, S., Gorno-Tempini, M. L., Ogar, J. M., Dronkers, N. F., & Miller, B. L. (2006). An overview on primary progressive aphasia and its variants. Behavioural Neurology, 17(2), 77–87. https://doi.org/10.1155/2006/260734
   PubMed Web of Science ®Google Scholar
• Antal, A., Alekseichuk, I., Bikson, M., Brockmoller, J., Brunoni, A. R., Chen, R., Cohen, L. G., Dowthwaite, G., Ellrich, J., Floel, A., Fregni, F., George, M. S., Hamilton, R., Haueisen, J., Herrmann, C. S., Hummel, F. C., Lefaucheur, J. P., Liebetanz, D., Loo, C. K., McCaig, C. D., … Paulus, W. (2017). Low intensity transcranial electric stimulation: Safety, ethical, legal regulatory and application guidelines. Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology, 128(9), 1774–1809. https://doi.org/10.1016/j.clinph.2017.06.001
   PubMed Web of Science ®Google Scholar
• Ashburner, J. (2007). A fast diffeomorphic image registration algorithm. Neuroimage, 38(1), 95–113. https://doi.org/10.1016/j.neuroimage.2007.07.007
   PubMed Web of Science ®Google Scholar
• Avants, B. B., Tustison, N. J., Wu, J., Cook, P. A., & Gee, J. C. (2011). An open source multivariate framework for n-tissue segmentation with evaluation on public data. Neuroinformatics, 9(4), 381–400. https://doi.org/10.1007/s12021-011-9109-y
   PubMed Web of Science ®Google Scholar
• Axmacher, N., Henseler, M. M., Jensen, O., Weinreich, I., Elger, C. E., & Fell, J. (2010). Cross-frequency coupling supports multi-item working memory in the human hippocampus. Proceedings of the National Academy of Sciences of the United States of America, 107(7), 3228–3233. https://doi.org/10.1073/pnas.0911531107
   PubMed Web of Science ®Google Scholar
• Bastiaansen, M. C., van der Linden, M., Ter Keurs, M., Dijkstra, T., & Hagoort, P. (2005). Theta responses are involved in lexical-semantic retrieval during language processing. Journal of Cognitive Neuroscience, 17(3), 530–541. https://doi.org/10.1162/0898929053279469
   PubMed Web of Science ®Google Scholar
• Benjamini, Y., & Hochberg, Y. (1995). Controlling the false discovery rate: A practical and powerful approach to multiple testing. Journal of the Royal Statistical Society (Methodological), 57(1), 289–300. https://doi.org/10.1111/j.2517-6161.1995.tb02031.x
   Web of Science ®Google Scholar
• Bikson, M., Grossman, P., Thomas, C., Zannou, A. L., Jiang, J., Adnan, T., Mourdoukoutas, A. P., Kronberg, G., Truong, D., Boggio, P., Brunoni, A. R., Charvet, L., Fregni, F., Fritsch, B., Gillick, B., Hamilton, R. H., Hampstead, B. M., Jankord, R., Kirton, A., Knotkova, H., … Woods, A. J. (2016). Safety of transcranial direct current stimulation: Evidence based update 2016. Brain Stimulation, 9(5), 641–661. https://doi.org/10.1016/j.brs.2016.06.004
   PubMed Web of Science ®Google Scholar
• Cotelli, M., Manenti, R., Petesi, M., Brambilla, M., Cosseddu, M., Zanetti, O., Miniussi, C., Padovani, A., & Borroni, B. (2014). Treatment of primary progressive aphasias by transcranial direct current stimulation combined with language training. Journal of Alzheimer’s Disease : JAD, 39(4), 799–808. https://doi.org/10.3233/JAD-131427
   PubMed Web of Science ®Google Scholar
• Cox, R. W. (1996). AFNI: Software for analysis and visualization of functional magnetic resonance neuroimages. Computers and Biomedical Research, an International Journal, 29(3), 162–173. https://doi.org/10.1006/cbmr.1996.0014
   PubMedGoogle Scholar
• Daume, J., Gruber, T., Engel, A. K., & Friese, U. (2017). Phase-Amplitude coupling and long-range phase synchronization reveal frontotemporal interactions during visual working memory. The Journal of Neuroscience : The Official Journal of the Society for Neuroscience, 37(2), 313–322. https://doi.org/10.1523/JNEUROSCI.2130-16.2016
   PubMed Web of Science ®Google Scholar
• de Aguiar, V., Zhao, Y., Faria, A., Ficek, B., Webster, K. T., Wendt, H., Wang, Z., Hillis, A. E., Onyike, C. U., Frangakis, C., Caffo, B., & Tsapkini, K. (2020). Brain volumes as predictors of tDCS effects in primary progressive aphasia. Brain and Language, 200, 104707. https://doi.org/10.1016/j.bandl.2019.104707
   PubMed Web of Science ®Google Scholar
• de Aguiar, V., Zhao, Y., Ficek, B. N., Webster, K., Rofes, A., Wendt, H., Frangakis, C., Caffo, B., Hillis, A. E., Rapp, B., & Tsapkini, K. (2020). Cognitive and language performance predicts effects of spelling intervention and tDCS in primary progressive aphasia. Cortex, 124, 66–84. https://doi.org/10.1016/j.cortex.2019.11.001
   PubMed Web of Science ®Google Scholar
• Dell, G. S. (1988). The retrieval of phonological forms in production: Tests of predictions from a connectionist model. Journal of Memory and Language, 27, 124–142. https://doi.org/10.1016/0749-596X(88)90070-8
   Web of Science ®Google Scholar
• Dell, G. S., Chang, F., & Griffin, Z. M. (1999). Connectionist models of language production: Lexical access and grammatical encoding. Cognitive Science, 23(4), 517–542.  https://doi.org/10.1207/s15516709cog2304_6
   Web of Science ®Google Scholar
• Deschamps, I., Baum, S. R., & Gracco, V. L. (2014). On the role of the supramarginal gyrus in phonological processing and verbal working memory: Evidence from rTMS studies. Neuropsychologia, 53, 39–46. https://doi.org/10.1016/j.neuropsychologia.2013.10.015
   PubMed Web of Science ®Google Scholar
• Engel, A. K., & Fries, P. (2010). Beta-band oscillations--signalling the status quo? Current Opinion in Neurobiology, 20(2), 156–165. https://doi.org/10.1016/j.conb.2010.02.015
   PubMed Web of Science ®Google Scholar
• Fanciullacci, C., Bertolucci, F., Lamola, G., Panarese, A., Artoni, F., Micera, S., Rossi, B., & Chisari, C. (2017). Delta power is higher and more symmetrical in ischemic stroke patients with cortical involvement. Frontiers in Human Neuroscience, 11, 385. https://doi.org/10.3389/fnhum.2017.00385
   PubMed Web of Science ®Google Scholar
• Fedorenko, E., & Thompson-Schill, S. L. (2014). Reworking the language network. Trends in Cognitive Sciences, 18(3), 120–126. https://doi.org/10.1016/j.tics.2013.12.006
   PubMed Web of Science ®Google Scholar
• Fenner, A. S., Webster, K. T., Ficek, B. N., Frangakis, C. E., & Tsapkini, K. (2019). Written verb naming improves after tDCS over the left IFG in primary progressive aphasia. Frontiers in Psychology, 10, 1396. https://doi.org/10.3389/fpsyg.2019.01396
   PubMed Web of Science ®Google Scholar
• Gill, J., Shah-Basak, P. P., & Hamilton, R. (2015). It’s the thought that counts: Examining the task-dependent effects of transcranial direct current stimulation on executive function. Brain Stimulation, 8(2), 253–259. https://doi.org/10.1016/j.brs.2014.10.018
   PubMed Web of Science ®Google Scholar
• Gorno-Tempini, M. L., Dronkers, N. F., Rankin, K. P., Ogar, J. M., Phengrasamy, L., Rosen, H. J., Johnson, J. K., Weiner, M. W., & Miller, B. L. (2004). Cognition and anatomy in three variants of primary progressive aphasia. Annals of Neurology, 55(3), 335–346. https://doi.org/10.1002/ana.10825
   PubMed Web of Science ®Google Scholar
• Gorno-Tempini, M. L., Hillis, A. E., Weintraub, S., Kertesz, A., Mendez, M., Cappa, S. F., Ogar, J. M., Rohrer, J. D., Black, S., Boeve, B. F., Manes, F., Dronkers, N. F., Vandenberghe, R., Rascovsky, K., Patterson, K., Miller, B. L., Knopman, D. S., Hodges, J. R., Mesulam, M. M., & Grossman, M. (2011). Classification of primary progressive aphasia and its variants. Neurology, 76(11), 1006–1014. https://doi.org/10.1212/WNL.0b013e31821103e6
   PubMed Web of Science ®Google Scholar
• Gorno-Tempini, M. L., Ogar, J. M., Brambati, S. M., Wang, P., Jeong, J. H., Rankin, K. P., Dronkers, N. F., & Miller, B. L. (2006). Anatomical correlates of early mutism in progressive nonfluent aphasia. Neurology, 67(10), 1849–1851. https://doi.org/10.1212/01.wnl.0000237038.55627.5b
   PubMed Web of Science ®Google Scholar
• Griffiths, B. J., Parish, G., Roux, F., Michelmann, S., van der Plas, M., Kolibius, L. D., Chelvarajah, R., Rollings, D. T., Sawlani, V., Hamer, H., Gollwitzer, S., Kreiselmeyer, G., Staresina, B., Wimber, M., & Hanslmayr, S. (2019). Directional coupling of slow and fast hippocampal gamma with neocortical alpha/beta oscillations in human episodic memory. Proceedings of the National Academy of Sciences of the United States of America, 116(43), 21834–21842. https://doi.org/10.1073/pnas.1914180116
   PubMed Web of Science ®Google Scholar
• Hanslmayr, S., Staudigl, T., & Fellner, M. C. (2012). Oscillatory power decreases and long-term memory: The information via desynchronization hypothesis. Frontiers in Human Neuroscience, 6, 74. https://doi.org/10.3389/fnhum.2012.00074
   PubMed Web of Science ®Google Scholar
• Hartwigsen, G., Baumgaertner, A., Price, C. J., Koehnke, M., Ulmer, S., & Siebner, H. R. (2010). Phonological decisions require both the left and right supramarginal gyri. Proceedings of the National Academy of Sciences of the United States of America, 107(38), 16494–16499. https://doi.org/10.1073/pnas.1008121107
   PubMed Web of Science ®Google Scholar
• Huang, M. X., Mosher, J. C., & Leahy, R. M. (1999). A sensor-weighted overlapping-sphere head model and exhaustive head model comparison for MEG. Physics in Medicine and Biology, 44(2), 423–440. http://www.ncbi.nlm.nih.gov/pubmed/10070792
   PubMed Web of Science ®Google Scholar
• Jensen, O., & Tesche, C. D. (2002). Frontal theta activity in humans increases with memory load in a working memory task. The European Journal of Neuroscience, 15(8), 1395–1399. https://doi.org/10.1046/j.1460-9568.2002.01975.x
   PubMed Web of Science ®Google Scholar
• Jeong, J. (2004). EEG dynamics in patients with Alzheimer’s disease. Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology, 115(7), 1490–1505. https://doi.org/10.1016/j.clinph.2004.01.001
   PubMed Web of Science ®Google Scholar
• Jokel, R., Graham, N., Rochon, E., & Leonard, C. (2014). Word retrieval therapies in primary progressive aphasia. Aphasiology, 28(8–9), 1038–1068. https://doi.org/10.1080/02687038.2014.899306
   Web of Science ®Google Scholar
• Kay, J., Lesser, R., & Coltheart, M. (1996). Psycholinguistic assessments of language processing in aphasia (PALPA): An introduction. Aphasiology, 10(2), 159–180. https://doi.org/10.1080/02687039608248403
   Web of Science ®Google Scholar
• Kielar, A., Deschamps, T., Chu, R. K., Jokel, R., Khatamian, Y. B., Chen, J. J., & Meltzer, J. A. (2016). Identifying dysfunctional cortex: Dissociable effects of stroke and aging on resting state dynamics in MEG and fMRI. Frontiers in Aging Neuroscience, 8, 40. https://doi.org/10.3389/fnagi.2016.00040
   PubMed Web of Science ®Google Scholar
• Kielar, A., Panamsky, L., Links, K. A., & Meltzer, J. A. (2015). Localization of electrophysiological responses to semantic and syntactic anomalies in language comprehension with MEG. Neuroimage, 105, 507–524. https://doi.org/10.1016/j.neuroimage.2014.11.016
   PubMed Web of Science ®Google Scholar
• Kielar, A., Shah-Basak, P. P., Deschamps, T., Jokel, R., & Meltzer, J. A. (2019). Slowing is slowing: Delayed neural responses to words are linked to abnormally slow resting state activity in primary progressive aphasia. Neuropsychologia, 129, 331–347. https://doi.org/10.1016/j.neuropsychologia.2019.04.007
   PubMed Web of Science ®Google Scholar
• Klimesch, W. (1999). EEG alpha and theta oscillations reflect cognitive and memory performance: A review and analysis. Brain Research. Brain Research Reviews, 29(2–3), 169–195. https://doi.org/10.1016/s0165-0173(98)00056-3
   PubMed Web of Science ®Google Scholar
• Klimesch, W., Doppelmayr, M., Stadler, W., Pollhuber, D., Sauseng, P., & Rohm, D. (2001). Episodic retrieval is reflected by a process specific increase in human electroencephalographic theta activity. Neuroscience Letters, 302(1), 49–52. https://doi.org/10.1016/s0304-3940(01)01656-1
   PubMed Web of Science ®Google Scholar
• Kuo, H. I., Bikson, M., Datta, A., Minhas, P., Paulus, W., Kuo, M. F., & Nitsche, M. A. (2013). Comparing cortical plasticity induced by conventional and high-definition 4 x 1 ring tDCS: A neurophysiological study. Brain Stimulation, 6(4), 644–648. https://doi.org/10.1016/j.brs.2012.09.010
   PubMed Web of Science ®Google Scholar
• Levenshtein, V. I. (1965). Binary codes capable of correcting deletions, insertions, and reversals. Doklady Akademii, 163(4), 845–848. h t tps://u i.adsabs.harvard.edu/abs/1966SPhD. . .10. .707L
   Google Scholar
• Lizio, R., Vecchio, F., Frisoni, G. B., Ferri, R., Rodriguez, G., & Babiloni, C. (2011). Electroencephalographic rhythms in Alzheimer’s disease. International Journal of Alzheimer’s Disease, 2011, 927573. https://doi.org/10.4061/2011/927573
   PubMedGoogle Scholar
• Meltzer, J. A., Kielar, A., Panamsky, L., Links, K. A., Deschamps, T., & Leigh, R. C. (2017). Electrophysiological signatures of phonological and semantic maintenance in sentence repetition. Neuroimage, 156, 302–314. https://doi.org/10.1016/j.neuroimage.2017.05.030
   PubMed Web of Science ®Google Scholar
• Meltzer, J. A., Negishi, M., Mayes, L. C., & Constable, R. T. (2007). Individual differences in EEG theta and alpha dynamics during working memory correlate with fMRI responses across subjects. Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology, 118(11), 2419–2436. https://doi.org/10.1016/j.clinph.2007.07.023
   PubMed Web of Science ®Google Scholar
• Mesulam, M. (2001). Primary progressive aphasia. Annals of Neurology, 49(4), 425–432. https://www.ncbi.nlm.nih.gov/pubmed/11310619
   PubMed Web of Science ®Google Scholar
• Mesulam, M. (2003). Primary progressive aphasia--a language-based dementia. The New England Journal of Medicine, 349(16), 1535–1542. https://doi.org/10.1056/NEJMra022435
   PubMed Web of Science ®Google Scholar
• Mesulam, M. (2008). Primary progressive aphasia pathology. Annals of Neurology, 63(1), 124–125. https://doi.org/10.1002/ana.20940
   PubMed Web of Science ®Google Scholar
• Mesulam, M. (2013). Primary progressive aphasia: A dementia of the language network. Dement Neuropsychol, 7(1), 2–9. https://doi.org/10.1590/s1980-57642013dn70100002
   PubMedGoogle Scholar
• Mesulam, M., Grossman, M., Hillis, A., Kertesz, A., & Weintraub, S. (2003). The core and halo of primary progressive aphasia and semantic dementia. Annals of Neurology, 54(Suppl 5), S11–14. https://doi.org/10.1002/ana.10569
   PubMed Web of Science ®Google Scholar
• Mesulam, M. M., Lalehzari, N., Rahmani, F., Ohm, D., Shahidehpour, R., Kim, G., Gefen, T., Weintraub, S., Bigio, E., & Geula, C. (2019). Cortical cholinergic denervation in primary progressive aphasia with Alzheimer pathology. Neurology, 92(14), e1580–e1588. https://doi.org/10.1212/WNL.0000000000007247
   PubMed Web of Science ®Google Scholar
• Minhas, P., Bansal, V., Patel, J., Ho, J. S., Diaz, J., Datta, A., & Bikson, M. (2010). Electrodes for high-definition transcutaneous DC stimulation for applications in drug delivery and electrotherapy, including tDCS. Journal of Neuroscience Methods, 190(2), 188–197. https://doi.org/10.1016/j.jneumeth.2010.05.007
   PubMed Web of Science ®Google Scholar
• Nestor, P. J., Graham, N. L., Fryer, T. D., Williams, G. B., Patterson, K., & Hodges, J. R. (2003). Progressive non-fluent aphasia is associated with hypometabolism centred on the left anterior insula. Brain, 126(Pt 11), 2406–2418. https://doi.org/10.1093/brain/awg240
   PubMed Web of Science ®Google Scholar
• Nickels, L. (1995). Getting it right? Using aphasic naming errors to evaluate theoretical models of spoken word recognition. Language and Cognitive Processes, 10(1), 13–45. https://doi.org/10.1080/01690969508407086
   Web of Science ®Google Scholar
• Nitsche, M. A., & Paulus, W. (2011). (2011). Transcranial direct current stimulation--update. Restorative Neurology and Neuroscience, 29(6), 463–492. https://doi.org/10.3233/RNN-2011-0618
   PubMed Web of Science ®Google Scholar
• Oberhuber, M., Hope, T. M. H., Seghier, M. L., Parker Jones, O., Prejawa, S., Green, D. W., & Price, C. J. (2016). Four functionally distinct regions in the left supramarginal gyrus support word processing. Cerebral Cortex (New York, N.Y. : 1991), 26(11), 4212–4226. https://doi.org/10.1093/cercor/bhw251
   PubMed Web of Science ®Google Scholar
• Osipova, D., Ahveninen, J., Kaakkola, S., Jaaskelainen, I. P., Huttunen, J., & Pekkonen, E. (2003). Effects of scopolamine on MEG spectral power and coherence in elderly subjects. Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology, 114(10), 1902–1907. https://doi.org/10.1016/s1388-2457(03)00165-2
   PubMed Web of Science ®Google Scholar
• Piai, V., Anderson, K. L., Lin, J. J., Dewar, C., Parvizi, J., Dronkers, N. F., & Knight, R. T. (2016). Direct brain recordings reveal hippocampal rhythm underpinnings of language processing. Proceedings of the National Academy of Sciences of the United States of America, 113(40), 11366–11371. https://doi.org/10.1073/pnas.1603312113
   PubMed Web of Science ®Google Scholar
• Piai, V., Roelofs, A., Rommers, J., Dahlslatt, K., & Maris, E. (2015). Withholding planned speech is reflected in synchronized beta-band oscillations. Frontiers in Human Neuroscience, 9, 549. https://doi.org/10.3389/fnhum.2015.00549
   PubMed Web of Science ®Google Scholar
• Piai, V., Roelofs, A., Rommers, J., & Maris, E. (2015). Beta oscillations reflect memory and motor aspects of spoken word production. Human Brain Mapping, 36(7), 2767–2780. https://doi.org/10.1002/hbm.22806
   PubMed Web of Science ®Google Scholar
• R Core Team. (2017). R: A language and environment for statistical computing. https://www.R-project.org/
   Google Scholar
• Rapp, B., Purcell, J., Hillis, A. E., Capasso, R., & Miceli, G. (2016). Neural bases of orthographic long-term memory and working memory in dysgraphia. Brain: a journal of neurology, 139(2), 588–604. https://doi.org/10.1093/brain/awv348
   PubMed Web of Science ®Google Scholar
• Raymer, A. M., Cudworth, C., & Haley, M. (2003). Spelling treatment for an individual with dysgraphia: Analysis of generalisation to untrained words. Aphasiology, 17(6/7), 607–624. https://doi.org/10.1080/02687030344000058
   Web of Science ®Google Scholar
• Riekkinen, P., Jr., Sirvio, J., & Riekkinen, P. (1990). Relationship between the cortical choline acetyltransferase content and EEG delta-power. Neuroscience Research, 8(1), 12–20. https://doi.org/10.1016/0168-0102(90)90052-g
   PubMed Web of Science ®Google Scholar
• Rogalski, E., Rademaker, A., Mesulam, M., & Weintraub, S. (2008). Covert processing of words and pictures in nonsemantic variants of primary progressive aphasia. Alzheimer Disease and Associated Disorders, 22(4), 343–351. https://doi.org/10.1097/WAD.0b013e31816c92f7
   PubMed Web of Science ®Google Scholar
• Rohm, D., Klimesch, W., Haider, H., & Doppelmayr, M. (2001). The role of theta and alpha oscillations for language comprehension in the human electroencephalogram. Neuroscience Letters, 310(2–3), 137–140. https://doi.org/10.1016/s0304-3940(01)02106-1
   PubMed Web of Science ®Google Scholar
• Roux, F., & Uhlhaas, P. J. (2014). Working memory and neural oscillations: Alpha-gamma versus theta-gamma codes for distinct WM information? Trends in Cognitive Sciences, 18(1), 16–25. https://doi.org/10.1016/j.tics.2013.10.010
   PubMed Web of Science ®Google Scholar
• RStudio Team. (2015). RStudio: Integrated Development for R Studio, Inc. http://www.rstudio.com/
   Google Scholar
• Sauseng, P., Griesmayr, B., Freunberger, R., & Klimesch, W. (2010). Control mechanisms in working memory: A possible function of EEG theta oscillations. Neuroscience and Biobehavioral Reviews, 34(7), 1015–1022. https://doi.org/10.1016/j.neubiorev.2009.12.006
   PubMed Web of Science ®Google Scholar
• Sauseng, P., Klimesch, W., Heise, K. F., Gruber, W. R., Holz, E., Karim, A. A., Glennon, M., Gerloff, C., Birbaumer, N., & Hummel, F. C. (2009). Brain oscillatory substrates of visual short-term memory capacity. Current Biology : CB, 19(21), 1846–1852. https://doi.org/10.1016/j.cub.2009.08.062
   PubMed Web of Science ®Google Scholar
• Schaeverbeke, J., Evenepoel, C., Bruffaerts, R., Van Laere, K., Bormans, G., Dries, E., Tousseyn, T., Nelissen, N., Peeters, R., Vandenbulcke, M., Dupont, P., & Vandenberghe, R. (2017). Cholinergic depletion and basal forebrain volume in primary progressive aphasia. Neuroimage Clin, 13, 271–279. https://doi.org/10.1016/j.nicl.2016.11.027
   PubMed Web of Science ®Google Scholar
• Sepelyak, K., Crinion, J., Molitoris, J., Epstein-Peterson, Z., Bann, M., Davis, C., Newhart, M., Heidler-Gary, J., Tsapkini, K., & Hillis, A. E. (2011). Patterns of breakdown in spelling in primary progressive aphasia. Cortex, 47(3), 342–352. https://doi.org/10.1016/j.cortex.2009.12.001
   PubMed Web of Science ®Google Scholar
• Shah-Basak, P., Kielar, A., Deschamps, T., Verhoeff, N. P., Jokel, R., & Meltzer, J. (2019). Spontaneous oscillatory markers of cognitive status in two forms of dementia. Human Brain Mapping, 40(5), 1594–1607. https://doi.org/10.1002/hbm.24470
   PubMed Web of Science ®Google Scholar
• Shah-Basak, P., Sivaratnam, G., Teti, S., Francois-Nienaber, A., Nayar, S., Jokel, R., & Meltzer, J. (2020). High definition transcranial direct current stimulation modulates abnormal neurophysiological activity in post-stroke aphasia. Scientific Reports, 10(1), 19625. https://doi.org/10.1038/s41598-020-76533-0
   PubMed Web of Science ®Google Scholar
• Singmann, H., Bolker, B., Westfall, J., Aust, F., & Ben-Shachar, M. S. (2020). afex: Analysis of factorial experiments. R package version 0.27-2. https://CRAN.R-project.org/package=afex
   Google Scholar
• Sliwinska, M. W., Khadilkar, M., Campbell-Ratcliffe, J., Quevenco, F., & Devlin, J. T. (2012). Early and sustained supramarginal gyrus contributions to phonological processing. Frontiers in Psychology, 3, 161. https://doi.org/10.3389/fpsyg.2012.00161
   PubMed Web of Science ®Google Scholar
• Stagg, C. J., Antal, A., & Nitsche, M. A. (2018). Physiology of transcranial direct current stimulation. The Journal of ECT, 34(3), 144–152. https://doi.org/10.1097/YCT.0000000000000510
   PubMed Web of Science ®Google Scholar
• Stella, F., & Treves, A. (2011). Associative memory storage and retrieval: Involvement of theta oscillations in hippocampal information processing. Neural Plasticity, 2011, 683961. https://doi.org/10.1155/2011/683961
   PubMed Web of Science ®Google Scholar
• Tan, L. H., Laird, A. R., Li, K., & Fox, P. T. (2005). Neuroanatomical correlates of phonological processing of Chinese characters and alphabetic words: A meta-analysis. Human Brain Mapping, 25(1), 83–91. https://doi.org/10.1002/hbm.20134
   PubMed Web of Science ®Google Scholar
• Teipel, S., Raiser, T., Riedl, L., Riederer, I., Schroeter, M. L., Bisenius, S., Schneider, A., Kornhuber, J., Fliessbach, K., Spottke, A., Grothe, M. J., Prudlo, J., Kassubek, J., Ludolph, A., Landwehrmeyer, B., Straub, S., Otto, M., & Danek, A. (2016). Atrophy and structural covariance of the cholinergic basal forebrain in primary progressive aphasia. Cortex, 83, 124–135. https://doi.org/10.1016/j.cortex.2016.07.004
   PubMed Web of Science ®Google Scholar
• Themistocleous, C., Neophytou, K., Rapp, B., & Tsapkini, K. (2020). A tool for automatic scoring of spelling performance. Journal of Speech, Language, and Hearing Research : JSLHR, 63(12), 4179–4192. https://doi.org/10.1044/2020_JSLHR-20-00177
   PubMed Web of Science ®Google Scholar
• Thomson, D. J. (1982). Spectrum estimation and harmonic analysis. Proceedings of the IEEE, 90(9), 1055–1096. Doi: 10.1109/PROC.1982.12433
   Web of Science ®Google Scholar
• Tippett, D. C., Hillis, A. E., & Tsapkini, K. (2015). Treatment of primary progressive aphasia. Current Treatment Options in Neurology, 17(8), 362. https://doi.org/10.1007/s11940-015-0362-5
   PubMed Web of Science ®Google Scholar
• Treiman, R., Caravolas, M., & Kessler, B. (2019). What methods of scoring young children’s spelling best predict later spelling performance? Journal of Research in Reading, 42(1), 80–96. https://doi.org/10.1111/1467-9817.12241
   PubMed Web of Science ®Google Scholar
• Tsapkini, K., Frangakis, C., Gomez, Y., Davis, C., & Hillis, A. E. (2014). Augmentation of spelling therapy with transcranial direct current stimulation in primary progressive aphasia: Preliminary results and challenges. Aphasiology, 28(8–9), 1112–1130. https://doi.org/10.1080/02687038.2014.930410
   PubMed Web of Science ®Google Scholar
• Tsapkini, K., & Hillis, A. E. (2013). Spelling intervention in post-stroke aphasia and primary progressive aphasia. Behavioural Neurology, 26(1–2), 55–66. https://doi.org/10.3233/BEN-2012-110240
   PubMed Web of Science ®Google Scholar
• Tsapkini, K., Webster, K. T., Ficek, B. N., Desmond, J. E., Onyike, C. U., Rapp, B., Frangakis, C. E., & Hillis, A. E. (2018). Electrical brain stimulation in different variants of primary progressive aphasia: A randomized clinical trial. Alzheimers Dement (N Y), 4, 461–472. https://doi.org/10.1016/j.trci.2018.08.002
   PubMedGoogle Scholar
• Villa, A. E., Tetko, I. V., Dutoit, P., & Vantini, G. (2000). Non-linear cortico-cortical interactions modulated by cholinergic afferences from the rat basal forebrain. Biosystems, 58(1–3), 219–228. https://doi.org/10.1016/s0303-2647(00)00126-x
   PubMed Web of Science ®Google Scholar
• Villamar, M. F., Volz, M. S., Bikson, M., Datta, A., Dasilva, A. F., & Fregni, F. (2013). Technique and considerations in the use of 4x1 ring high-definition transcranial direct current stimulation (HD-tDCS). Journal of Visualized Experiments : JoVE, (77), e50309. https://doi.org/10.3791/50309
   PubMed Web of Science ®Google Scholar
• Vrba, J., & Robinson, S. E. (2001). Signal processing in magnetoencephalography. Methods, 25(2), 249–271. https://doi.org/10.1006/meth.2001.1238
   PubMed Web of Science ®Google Scholar
• Weiss, S., & Mueller, H. M. (2012). “Too many betas do not spoIL THE BRoth”: The role of beta brain oscillations in language processing. Frontiers in Psychology, 3, 201. https://doi.org/10.3389/fpsyg.2012.00201
   PubMed Web of Science ®Google Scholar
• Wilson, S. M., Galantucci, S., Tartaglia, M. C., & Gorno-Tempini, M. L. (2012). The neural basis of syntactic deficits in primary progressive aphasia. Brain and Language, 122(3), 190–198. https://doi.org/10.1016/j.bandl.2012.04.005
   PubMed Web of Science ®Google Scholar