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Heather M. Clark, Ph.D.

  1. Neurologic Communicative Disorder Specialist
  2. Speech-Language Pathologist
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Publications

  1. Blazek AM, Meade G, Jackson LM, Gavrilova R, Stierwalt J, Martinez-Thompson JM, Duffy JR, Clark H, Machulda MM, Whitwell JL, Josephs KA, Utianski RL, Botha H. Progressive Apraxia of Speech as a Manifestation of Spinocerebellar Ataxia 2: Case Report. Neurol Genet. 2024 Dec; 10 (6):e200202 Epub 2024 Nov 01
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  2. Meade G, Pham NTT, Clark HM, Duffy JR, Whitwell JL, Josephs KA, Utianski RL. Progression of Motor Speech Function in Speakers With Primary Progressive Apraxia of Speech. J Speech Lang Hear Res. 2024 Nov 15; 1-12 [Epub ahead of print]
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  3. Badihian N, Tosakulwong N, Weigand SD, Ali F, Clark HM, Stierwalt J, Botha H, Savica R, Dickson DW, Whitwell JL, Josephs KA. Relationships between regional burden of tau pathology and age at death and disease duration in PSP. Parkinsonism Relat Disord. 2024 Oct; 127:107109 Epub 2024 Aug 17
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  4. Tetzloff KA, Wiepert D, Botha H, Duffy JR, Clark HM, Whitwell JL, Josephs KA, Utianski RL. Automatic Speech Recognition in Primary Progressive Apraxia of Speech. J Speech Lang Hear Res. 2024 Sep 12; 67 (9):2964-2976 Epub 2024 Aug 06
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  5. Wauters LD, Croot K, Dial HR, Duffy JR, Grasso SM, Kim E, Schaffer Mendez K, Ballard KJ, Clark HM, Kohley L, Murray LL, Rogalski EJ, Figeys M, Milman L, Henry ML. Behavioral Treatment for Speech and Language in Primary Progressive Aphasia and Primary Progressive Apraxia of Speech: A Systematic Review. Neuropsychol Rev. 2024 Sep; 34 (3):882-923 Epub 2023 Oct 04
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  6. Garcia-Guaqueta DP, Botha H, Utianski RL, Duffy JR, Clark H, Meade G, Machulda MM, Dickson DW, Pham NTT, Whitwell JL, Josephs KA. Clinicopathologic and Neuroimaging Correlations of Nonverbal Oral Apraxia in Patients With Neurodegenerative Disease. Neurology. 2024 Aug 27; 103 (4):e209717 Epub 2024 July 30
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  7. Shir D, Corriveau-Lecavalier N, Bermudez Noguera C, Barnard L, Pham NTT, Botha H, Duffy JR, Clark HM, Utianski RL, Knopman DS, Petersen RC, Boeve BF, Murray ME, Nguyen AT, Reichard RR, Dickson DW, Day GS, Kremers WK, Graff-Radford NR, Jones DT, Machulda MM, Fields JA, Whitwell JL, Josephs KA, Graff-Radford J. Clinicoradiological and neuropathological evaluation of primary progressive aphasia. J Neurol Neurosurg Psychiatry. 2024 Aug 16; 95 (9):812-821
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  8. Badihian N, Gatto RG, Satoh R, Ali F, Clark HM, Pham NTT, Whitwell JL, Josephs KA. Clinical and neuroimaging characteristics of primary lateral sclerosis with overlapping features of progressive supranuclear palsy. Eur J Neurol. 2024 Aug; 31 (8):e16320 Epub 2024 Apr 30
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  9. Garcia-Guaqueta DP, Stephens YC, Ali F, Utianski RL, Duffy JR, Clark HM, Thu Pham NT, Machulda MM, Lowe VJ, Dickson DW, Whitwell JL, Josephs KA. Comparing classic-onset corticobasal syndrome to speech/language-onset corticobasal syndrome. Parkinsonism Relat Disord. 2024 Aug; 125:107025 Epub 2024 June 03
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  10. Meade G, Thu Pham NT, Schwarz CG, Clark HM, Duffy JR, Senjem ML, Lowe V, Botha H, Whitwell JL, Josephs KA, Utianski RL. The yes-no reversal phenomenon in patients with primary progressive apraxia of speech. Cortex. 2024 Aug; 177:28-36 Epub 2024 May 04
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  11. Meade G, Machulda MM, Clark HM, Duffy JR, Botha H, Whitwell JL, Josephs KA, Utianski RL. Identifying and Addressing Functional Communication Challenges in Patients With Behavioral Variant Frontotemporal Dementia. Am J Speech Lang Pathol. 2024 Jul 3; 33 (4):1573-1589 Epub 2024 June 06
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  12. Garcia-Guaqueta DP, Botha H, Utianski RL, Duffy JR, Clark HM, Goodrich AW, Pham NTT, Machulda MM, Baker M, Rademakers R, Whitwell JL, Josephs KA. Progression to corticobasal syndrome: a longitudinal study of patients with nonfluent primary progressive aphasia and primary progressive apraxia of speech. J Neurol. 2024 Jul; 271 (7):4168-4179 Epub 2024 Apr 07
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  13. Gatto RG, Pham NTT, Duffy JR, Clark HM, Utianski RL, Botha H, Machulda MM, Lowe VJ, Schwarz CG, Jack CR Jr, Josephs KA, Whitwell JL. Multimodal cross-examination of progressive apraxia of speech by diffusion tensor imaging-based tractography and Tau-PET scans. Hum Brain Mapp. 2024 Jun 1; 45 (8):e26704
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  14. Tetzloff KA, Martin PR, Duffy JR, Utianski RL, Clark HM, Botha H, Machulda MM, Thu Pham NT, Schwarz CG, Senjem ML, Jack CR Jr, Lowe VJ, Josephs KA, Whitwell JL. Longitudinal flortaucipir, metabolism and volume differ between phonetic and prosodic speech apraxia. Brain. 2024 May 3; 147 (5):1696-1709
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  15. Meade G, Whitwell JL, Dickson DW, Duffy JR, Clark HM, Ahlskog JE, Machulda MM, Josephs KA, Utianski RL. Primary Progressive Apraxia of Speech Caused by TDP-43: A Case Report. Neurol Genet. 2024 Apr; 10 (2):e200134 Epub 2024 Mar 19
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  16. Petroi-Bock D, Clark HM, Stierwalt JAG, Botha H, Ali F, Whitwell JL, Josephs KA. Influences of motor speech impairments on the presentation of dysphagia in progressive supranuclear palsy. Int J Speech Lang Pathol. 2024 Apr; 26 (2):278-288 Epub 2023 June 19
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  17. Tetzloff KA, Duffy JR, Clark HM, Josephs KA, Whitwell JL, Utianski RL. Characterizing Speech Errors Across Primary Progressive Apraxia of Speech Subtypes. J Speech Lang Hear Res. 2024 Mar 11; 67 (3):811-820 Epub 2024 Feb 20
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  18. Gatto RG, Martin PR, Utianski RL, Duffy JR, Clark HM, Botha H, Machulda MM, Josephs KA, Whitwell JL. Diffusion tensor imaging-based multi-fiber tracking reconstructions can regionally differentiate phonetic versus prosodic subtypes of progressive apraxia of speech. Cortex. 2024 Feb; 171:272-286 Epub 2023 Nov 08
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  19. Badihian N, Ali F, Botha H, Savica R, Machulda MM, Clark HM, Stierwalt JAG, Pham NTT, Baker MC, Rademakers R, Lowe V, Whitwell JL, Josephs KA. The MAPT p.E342K and p.R406W mutations are associated with progressive supranuclear palsy with atypical features. Parkinsonism Relat Disord. 2024 Feb; 119:105962 Epub 2023 Dec 17
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  20. Orlandi F, Carlos AF, Ali F, Clark HM, Duffy JR, Utianski RL, Botha H, Machulda MM, Stephens YC, Schwarz CG, Senjem ML, Jack CR, Agosta F, Filippi M, Dickson DW, Josephs KA, Whitwell JL. Histologic tau lesions and magnetic resonance imaging biomarkers differ across two progressive supranuclear palsy variants. Brain Commun. 2024; 6 (2):fcae113 Epub 2024 Apr 05
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  21. Carlos AF, Weigand SD, Duffy JR, Clark HM, Utianski RL, Machulda MM, Botha H, Thu Pham NT, Lowe VJ, Schwarz CG, Whitwell JL, Josephs KA. Volumetric analysis of hippocampal subregions and subfields in left and right semantic dementia. Brain Commun. 2024; 6 (2):fcae097 Epub 2024 Mar 25
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  22. Gatto RG, Meade G, Duffy JR, Clark HM, Utianski RL, Botha H, Machulda MM, Josephs KA, Whitwell JL. Combined assessment of progressive apraxia of speech brain microstructure by diffusion tensor imaging tractography and multishell neurite orientation dispersion and density imaging. Brain Behav. 2024 Jan; 14 (1):e3346
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  23. Singh-Reilly N, Botha H, Duffy JR, Clark HM, Utianski RL, Machulda MM, Graff-Radford J, Schwarz CG, Petersen RC, Lowe VJ, Jack CR Jr, Josephs KA, Whitwell JL. Speech-language within and between network disruptions in primary progressive aphasia variants. Neuroimage Clin. 2024; 43:103639. Epub 2024 Jul 04.
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  24. Utianski RL, Meade G, Duffy JR, Clark HM, Botha H, Machulda MM, Dickson DW, Whitwell JL, Josephs KA. Longitudinal characterization of patients with progressive apraxia of speech without clearly predominant phonetic or prosodic speech features. Brain Lang. 2023 Oct; 245:105314 Epub 2023 Aug 20
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  25. Utianski RL, Martin PR, Duffy JR, Clark HM, Stierwalt JAG, Botha H, Ali F, Whitwell JL, Josephs KA. Assessing Patients and Care Partner Ratings of Communication-Related Participation Restrictions: Insights From Degenerative Disease. Am J Speech Lang Pathol. 2023 Aug 17; 32 (4S):1793-1805 Epub 2023 Feb 09
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  26. Utianski RL, Duffy JR, Martin PR, Clark HM, Stierwalt JAG, Botha H, Ali F, Whitwell JL, Josephs KA. Rate Modulation Abilities in Acquired Motor Speech Disorders. J Speech Lang Hear Res. 2023 Aug 17; 66 (8S):3194-3205 Epub 2023 Feb 13
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  27. Josephs KA, Duffy JR, Martin PR, Stephens YC, Singh NA, Clark HM, Botha H, Lowe VJ, Whitwell JL, Utianski RL. Acoustic Analysis and Neuroimaging Correlates of Diadochokinetic Rates in Mild-Moderate Primary Progressive Apraxia of Speech. Brain Lang. 2023 May; 240 Epub 2023 Apr 06
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  28. Chandregowda A, Clark HM, Machulda MM, Pham NTT, Lowe VJ, Josephs KA, Whitwell JL. A Case of Atypical Alzheimer's Disease With Clinical Manifestation That Straddled the Boundary Between Primary Progressive Aphasia and Posterior Cortical Atrophy. Neurologist. 2023 May 1; 28 (3):195-197 Epub 2023 May 01
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  29. Duffy JR, Martin PR, Clark HM, Utianski RL, Strand EA, Whitwell JL, Josephs KA. The Apraxia of Speech Rating Scale: Reliability, Validity, and Utility. Am J Speech Lang Pathol. 2023 Mar 9; 32 (2):469-491 Epub 2023 Jan 11
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  30. Chenausky KV, Baas B, Stoeckel R, Brown T, Green JR, Runke C, Schimmenti L, Clark H. Comorbidity and Severity in Childhood Apraxia of Speech: A Retrospective Chart Review. J Speech Lang Hear Res. 2023 Mar 07; 66(3):791-803. Epub 2023 Feb 16.
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  31. Pavone C, Weigand SW, Ali F, Clark HM, Botha H, Machulda MM, Savica R, Pham NTT, Grijalva RM, Schwarz CG, Senjem ML, Agosta F, Filippi M, Jack CR, Lowe VJ, Josephs KA, Whitwell JL. Longitudinal clinical decline and baseline predictors in progressive supranuclear palsy. Parkinsonism Relat Disord. 2023 Feb; 107:105290 Epub 2023 Jan 16
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  32. Tetzloff KA, Duffy JR, Clark HM, Pham NTT, Machulda MM, Botha H, Jack CR, Dickson DW, Lowe VJ, Josephs KA, Whitwell JL, Utianski RL. Amyloid and Tau PET Positivity in Progressive Agrammatic Aphasia and Apraxia of Speech. J Alzheimers Dis. 2023; 96 (4):1759-1765
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  33. Utianski RL, Trang Thu Pham N, Botha H, Ali F, Duffy JR, Clark HM, Lowe VJ, Whitwell JL, Josephs KA. Longitudinal changes in dopamine transporter uptake scans in progressive apraxia of speech. Clin Park Relat Disord. 2023; 9:100207 Epub 2023 June 16
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  34. Satoh R, Arani A, Senjem ML, Duffy JR, Clark HM, Utianski RL, Botha H, Machulda MM, Jack CR Jr, Whitwell JL, Josephs KA. Spatial patterns of elevated magnetic susceptibility in progressive apraxia of speech. Neuroimage Clin. 2023; 38:103394 Epub 2023 Mar 28
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  35. Utianski RL, Clark HM, Martin PR, Stierwalt JAG, Duffy JR, Botha H, Ali F, Josephs KA. Patient and Care Partner Ratings of Communication Participation in Frontotemporal Dementia. Alzheimers Dement. 2022 Dec; 18 Suppl 9:e060715
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  36. Sintini I, Duffy JR, Clark HM, Utianski RL, Botha H, Machulda MM, Senjem ML, Strand EA, Schwarz CG, Lowe VJ, Jack CR, Josephs KA, Whitwell JL. Functional connectivity to the premotor cortex maps onto longitudinal brain neurodegeneration in progressive apraxia of speech. Neurobiol Aging. 2022 Dec; 120:105-116 Epub 2022 Sept 02
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  37. Carlos AF, Sekiya H, Koga S, Pham NTT, Ali F, Botha H, Clark HM, Coon EA, Lowe V, Ahlskog JE, Trejo-Lopez JA, Dickson DW, Whitwell JL, Josephs KA. Tau-PET and multimodal imaging in clinically atypical multiple system atrophy masquerading as progressive supranuclear palsy. Parkinsonism Relat Disord. 2022 Aug; 101:9-14 Epub 2022 June 16
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  38. Polsinelli AJ, Machulda MM, Martin PR, Duffy JR, Clark HM, Butts AM, Botha H, Lowe VJ, Whitwell JL, Josephs KA, Utianski RL. Neuropsychological Profiles of Patients with Progressive Apraxia of Speech and Aphasia. J Int Neuropsychol Soc. 2022 May; 28 (5):441-451 Epub 2021 July 22
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  39. Grijalva RM, Pham NTT, Huang Q, Martin PR, Ali F, Clark HM, Duffy JR, Utianski RL, Botha H, Machulda MM, Weigand SD, Ahlskog JE, Dickson DW, Josephs KA, Whitwell JL. Brainstem Biomarkers of Clinical Variant and Pathology in Progressive Supranuclear Palsy. Mov Disord. 2022 Apr; 37 (4):702-712 Epub 2021 Dec 31
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  40. Utianski RL, Botha H, Caviness JN, Worrell GA, Duffy JR, Clark HM, Whitwell JL, Josephs KA. A Preliminary Report of Network Electroencephalographic Measures in Primary Progressive Apraxia of Speech and Aphasia. Brain Sci. 2022 Mar 12; 12 (3)
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  41. Clark HM, Duffy JR, Strand EA, Hanley H, Solomon NP. Orofacial Muscle Strength across the Dysarthrias. Brain Sci. 2022 Mar 10; 12(3).
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  42. Bower SM, Weigand SD, Ali F, Clark HM, Botha H, Stierwalt JA, Whitwell JL, Josephs KA. Depression and Apathy across Different Variants of Progressive Supranuclear Palsy. Mov Disord Clin Pract. 2022 Feb; 9 (2):212-217 Epub 2021 Dec 31
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  43. Gatto RG, Martin PR, Ali F, Clark HM, Duffy JR, Utianski RL, Botha H, Machulda MM, Dickson DW, Josephs KA, Whitwell JL. Diffusion tractography of superior cerebellar peduncle and dentatorubrothalamic tracts in two autopsy confirmed progressive supranuclear palsy variants: Richardson syndrome and the speech-language variant. Neuroimage Clin. 2022; 35:103030 Epub 2022 May 11
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  44. Carlos AF, Tosakulwong N, Weigand SD, Buciuc M, Ali F, Clark HM, Botha H, Utianski RL, Machulda MM, Schwarz CG, Reid RI, Senjem ML, Jack CR Jr, Ahlskog JE, Dickson DW, Josephs KA, Whitwell JL. Histologic lesion type correlates of magnetic resonance imaging biomarkers in four-repeat tauopathies. Brain Commun. 2022; 4 (3):fcac108 Epub 2022 Apr 28
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  45. Hokelekli FO, Duffy JR, Clark HM, Utianski RL, Botha H, Stierwalt JA, Strand EA, Machulda MM, Whitwell JL, Josephs KA. Cross-Sectional and Longitudinal Assessment of Behavior in Primary Progressive Apraxia of Speech and Agrammatic Aphasia. Dement Geriatr Cogn Disord. 2022; 51 (2):193-202 Epub 2022 May 06
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  46. Hokelekli FO, Duffy JR, Clark HM, Utianski RL, Botha H, Ali F, Stierwalt JA, Machulda MM, Reichard RR, Dickson DW, Whitwell JL, Josephs KA. Autopsy Validation of Progressive Supranuclear Palsy-Predominant Speech/Language Disorder Criteria. Mov Disord. 2022 Jan; 37 (1):213-218 Epub 2021 Oct 10
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  47. Keser Z, Buchl SC, Seven NA, Markota M, Clark HM, Jones DT, Lanzino G, Brown RD Jr, Worrell GA, Lundstrom BN. Electroencephalogram (EEG) With or Without Transcranial Magnetic Stimulation (TMS) as Biomarkers for Post-stroke Recovery: A Narrative Review. Front Neurol. 2022; 13:827866 Epub 2022 Feb 22
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  48. Valls Carbo A, Reid RI, Tosakulwong N, Weigand SD, Duffy JR, Clark HM, Utianski RL, Botha H, Machulda MM, Strand EA, Schwarz CG, Jack CR, Josephs KA, Whitwell JL. Tractography of supplementary motor area projections in progressive speech apraxia and aphasia. Neuroimage Clin. 2022; 34:102999 Epub 2022 Mar 30
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  49. Chandregowda A, Clark HM, Duffy JR, Machulda MM, Lowe VJ, Whitwell JL, Josephs KA. Dynamic Aphasia as a Variant of Frontotemporal Dementia. Cogn Behav Neurol. 2021 Dec 2; 34 (4):303-318 Epub 2021 Dec 02
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  50. Dang J, Graff-Radford J, Duffy JR, Utianski RL, Clark HM, Stierwalt JA, Whitwell JL, Josephs KA, Botha H. Progressive apraxia of speech: delays to diagnosis and rates of alternative diagnoses. J Neurol. 2021 Dec; 268 (12):4752-4758 Epub 2021 May 04
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  51. Utianski RL, Martin PR, Duffy JR, Botha H, Clark HM, Josephs KA. Assessing Change in Communication Limitations in Primary Progressive Apraxia of Speech and Aphasia: A 1-Year Follow-Up Study. Am J Speech Lang Pathol. 2021 Nov 4; 30 (6):2368-2378 Epub 2021 Sept 07
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  52. Clark HM, Tosakulwong N, Weigand SD, Ali F, Botha H, Pham NTT, Schwarz CG, Reid RI, Senjem ML, Jack CR Jr, Lowe VJ, Ahlskog JE, Josephs KA, Whitwell JL. Gray and White Matter Correlates of Dysphagia in Progressive Supranuclear Palsy. Mov Disord. 2021 Nov; 36 (11):2669-2675 Epub 2021 Aug 23
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  53. Chandregowda A, Clark HM. Characterizing Anarthria to Facilitate Neurological Diagnosis: A Case Illustration Perspectives of the ASHA Special Interest Groups. 2021.
  54. Hokelekli FO, Ali F, Carlos AF, Martin PR, Clark HM, Duffy JR, Utianski RL, Botha H, St Louis EK, Whitwell JL, Josephs KA. Sleep disturbances in the speech-language variant of progressive supranuclear palsy. Parkinsonism Relat Disord. 2021 Oct; 91:9-12 Epub 2021 Aug 18
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  55. Whitwell JL, Tosakulwong N, Clark HM, Ali F, Botha H, Weigand SD, Sintini I, Machulda MM, Schwarz CG, Reid RI, Jack CR Jr, Ahlskog JE, Josephs KA. Diffusion tensor imaging analysis in three progressive supranuclear palsy variants. J Neurol. 2021 Sep; 268 (9):3409-3420 Epub 2021 Mar 12
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  56. Clark HM, Utianski RL, Ali F, Botha H, Whitwell JL, Josephs KA. Motor Speech Disorders and Communication Limitations in Progressive Supranuclear Palsy. Am J Speech Lang Pathol. 2021 Jun 18; 30 (3S):1361-1372 Epub 2021 Mar 09
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  57. Josephs KA, Duffy JR, Clark HM, Utianski RL, Strand EA, Machulda MM, Botha H, Martin PR, Pham NTT, Stierwalt J, Ali F, Buciuc M, Baker M, Fernandez De Castro CH, Spychalla AJ, Schwarz CG, Reid RI, Senjem ML, Jack CR Jr, Lowe VJ, Bigio EH, Reichard RR, Polley EJ, Ertekin-Taner N, Rademakers R, DeTure MA, Ross OA, Dickson DW, Whitwell JL. A molecular pathology, neurobiology, biochemical, genetic and neuroimaging study of progressive apraxia of speech. Nat Commun. 2021 Jun 8; 12 (1):3452 Epub 2021 June 08
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  58. Clark HM. Distinguishing Spastic and Dystonic Features in a Patient With a History of Brain Stem Encephalitis: A Clinical Case Study Perspectives of the ASHA Special Interest Groups. 2021.
  59. Whitwell JL, Martin P, Duffy JR, Clark HM, Utianski RL, Botha H, Machulda MM, Strand EA, Josephs KA. Survival Analysis in Primary Progressive Apraxia of Speech and Agrammatic Aphasia. Neurol Clin Pract. 2021 Jun; 11 (3):249-255
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  60. Utianski RL, Martin PR, Hanley H, Duffy JR, Botha H, Clark HM, Whitwell JL, Josephs KA. A Longitudinal Evaluation of Speech Rate in Primary Progressive Apraxia of Speech. J Speech Lang Hear Res. 2021 Feb 17; 64 (2):392-404 Epub 2021 Jan 21
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  61. Chandregowda A, Stierwalt JA, Clark HM. Facilitating End-of-Life Interaction Between Patients With Severe Communication Impairment and Their Families Perspectives of the ASHA Special Interest Groups. 2021; 6(3):649-653.
  62. Curet Burleson AX, Pham NTT, Buciuc M, Botha H, Duffy JR, Clark HM, Utianski RL, Machulda MM, Baker MC, Rademakers R, Lowe VJ, Whitwell JL, Josephs KA. Neurobehavioral Characteristics of FDG-PET Defined Right-Dominant Semantic Dementia: A Longitudinal Study. Dement Geriatr Cogn Disord. 2021; 50 (1):17-28 Epub 2021 Mar 23
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  63. Seckin ZI, Duffy JR, Strand EA, Clark HM, Utianski RL, Machulda MM, Botha H, Ali F, Thu Pham NT, Lowe VJ, Whitwell JL, Josephs KA. The evolution of parkinsonism in primary progressive apraxia of speech: A 6-year longitudinal study. Parkinsonism Relat Disord. 2020 Dec; 81:34-40. Epub 2020 Oct 07.
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  64. Utianski RL, Clark HM, Duffy JR, Botha H, Whitwell JL, Josephs KA. Communication Limitations in Patients With Progressive Apraxia of Speech and Aphasia. Am J Speech Lang Pathol. 2020 Nov 12; 29 (4):1976-1986 Epub 2020 Aug 05
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  65. Ghirelli A, Tosakulwong N, Weigand SD, Clark HM, Ali F, Botha H, Duffy JR, Utianski RL, Buciuc M, Murray ME, Labuzan SA, Spychalla AJ, Pham NTT, Schwarz CG, Senjem ML, Machulda MM, Baker M, Rademakers R, Filippi M, Jack CR Jr, Lowe VJ, Parisi JE, Dickson DW, Josephs KA, Whitwell JL. Sensitivity-Specificity of Tau and Amyloid beta Positron Emission Tomography in Frontotemporal Lobar Degeneration. Ann Neurol. 2020 Nov; 88 (5):1009-1022 Epub 2020 Sept 12
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  66. Seckin ZI, Whitwell JL, Utianski RL, Botha H, Ali F, Duffy JR, Clark HM, Machulda MM, Jordan LG, Min HK, Lowe VJ, Josephs KA. Ioflupane 123I (DAT scan) SPECT identifies dopamine receptor dysfunction early in the disease course in progressive apraxia of speech. J Neurol. 2020 Sep; 267(9):2603-2611. Epub 2020 May 09.
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  67. Utianski RL, Botha H, Whitwell JL, Martin PR, Schwarz CG, Duffy JR, Clark HM, Spychalla AJ, Senjem ML, Petersen RC, Knopman DS, Jack CR Jr, Lowe VJ, Josephs KA. Longitudinal flortaucipir ([(18)F]AV-1451) PET uptake in semantic dementia. Neurobiol Aging. 2020 Aug; 92:135-140 Epub 2020 Apr 18
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  68. Clark HM, Stierwalt JAG, Tosakulwong N, Botha H, Ali F, Whitwell JL, Josephs KA. Dysphagia in Progressive Supranuclear Palsy. Dysphagia. 2020 Aug; 35 (4):667-676 Epub 2019 Nov 01
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  69. Utianski RL, Martin PR, Botha H, Schwarz CG, Duffy JR, Petersen RC, Knopman DS, Clark HM, Butts AM, Machulda MM, Jack CR Jr, Lowe VJ, Whitwell JL, Josephs KA. Longitudinal flortaucipir ([(18)F]AV-1451) PET imaging in primary progressive apraxia of speech. Cortex. 2020 Mar; 124:33-43 Epub 2019 Nov 19
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  70. Clark HM, Utianski RL, Duffy JR, Strand EA, Botha H, Josephs KA, Whitwell JL. Western Aphasia Battery-Revised Profiles in Primary Progressive Aphasia and Primary Progressive Apraxia of Speech. Am J Speech Lang Pathol. 2020 Feb 21; 29 (1S):498-510 Epub 2019 Oct 22
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  71. Whitwell JL, Tosakulwong N, Botha H, Ali F, Clark HM, Duffy JR, Utianski RL, Stevens CA, Weigand SD, Schwarz CG, Senjem ML, Jack CR, Lowe VJ, Ahlskog JE, Dickson DW, Josephs KA. Brain volume and flortaucipir analysis of progressive supranuclear palsy clinical variants. Neuroimage Clin. 2020; 25:102152 Epub 2019 Dec 28
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  72. Whitwell JL, Tosakulwong N, Weigand SD, Graff-Radford J, Duffy JR, Clark HM, Machulda MM, Botha H, Utianski RL, Schwarz CG, Senjem ML, Strand EA, Ertekin-Taner N, Jack CR, Lowe VJ, Josephs KA. Longitudinal Amyloid-beta PET in Atypical Alzheimer's Disease and Frontotemporal Lobar Degeneration. J Alzheimers Dis. 2020; 74 (1):377-389
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  73. Solomon NP, Clark HM. The effect of an anti-slip surface on objective measures of tongue strength in healthy adults. International Journal of Orofacial Myology & Myofunctional Therapy. 2020; 13-21
  74. Utianski RL, Botha H, Martin PR, Schwarz CG, Duffy JR, Clark HM, Machulda MM, Butts AM, Lowe VJ, Jack CR Jr, Senjem ML, Spychalla AJ, Whitwell JL, Josephs KA. Clinical and neuroimaging characteristics of clinically unclassifiable primary progressive aphasia. Brain Lang. 2019 Oct; 197:104676 Epub 2019 Aug 13
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  75. Utianski RL, Duffy JR, Clark HM, Machulda MM, Dickson DW, Whitwell JL, Josephs KA. Prominent auditory deficits in primary progressive aphasia: A case study. Cortex. 2019 Aug; 117:396-406 Epub 2019 Feb 21
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  76. Tetzloff KA, Duffy JR, Clark HM, Utianski RL, Strand EA, Machulda MM, Botha H, Martin PR, Schwarz CG, Senjem ML, Reid RI, Gunter JL, Spychalla AJ, Knopman DS, Petersen RC, Jack CR, Lowe VJ, Josephs KA, Whitwell JL. Progressive agrammatic aphasia without apraxia of speech as a distinct syndrome. Brain. 2019 Aug 01; 142(8):2466-2482.
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  77. Whitwell JL, Stevens CA, Duffy JR, Clark HM, Machulda MM, Strand EA, Martin PR, Utianski RL, Botha H, Spychalla AJ, Senjem ML, Schwarz CG, Jack CR Jr, Ali F, Hassan A, Josephs KA. An Evaluation of the Progressive Supranuclear Palsy Speech/Language Variant. Mov Disord Clin Pract. 2019 Jul; 6 (6):452-461 Epub 2019 May 29
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  78. Whitwell JL, Martin PR, Duffy JR, Clark HM, Machulda MM, Schwarz CG, Weigand SD, Sintini I, Senjem ML, Ertekin-Taner N, Botha H, Utianski RL, Graff-Radford J, Jones DT, Boeve BF, Knopman DS, Petersen RC, Jack CR Jr, Lowe VJ, Josephs KA. The influence of beta-amyloid on [(18)F]AV-1451 in semantic variant of primary progressive aphasia. Neurology. 2019 Feb 12; 92 (7):e710-e722 Epub 2019 Jan 11
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  79. Utianski RL, Caviness JN, Worrell GA, Duffy JR, Clark HM, Machulda MM, Whitwell JL, Josephs KA. Electroencephalography in Primary Progressive Aphasia and Apraxia of Speech. Aphasiology. 2019; 33 (11):1410-1417 Epub 2018 Nov 16
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  80. Utianski RL, Botha H, Duffy JR, Clark HM, Martin PR, Butts AM, Machulda MM, Whitwell JL, Josephs KA. Rapid rate on quasi-speech tasks in the semantic variant of primary progressive aphasia: A non-motor phenomenon? J Acoust Soc Am. 2018 Dec; 144 (6):3364
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  81. Utianski RL, Duffy JR, Clark HM, Strand EA, Boland SM, Machulda MM, Whitwell JL, Josephs KA. Clinical Progression in Four Cases of Primary Progressive Apraxia of Speech. Am J Speech Lang Pathol. 2018 Nov 21; 27 (4):1303-1318
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