Table 1.
Participant demographic and baseline testing information.
| Participant | PPA subtype | Sex | Education (years) | Age (years) | Post symptom onset (years) | Stimulation order | tDCS stimulation dose |
Baseline testing |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WAB-R (AQ) | BNT | PPT–Short Form (%) | KD–Short Form (%) | SR (% of correct sentences) | SOAP–canonical (%) | SOAP–noncanonical (%) | ABA-2 (Apraxia Severity) | ||||||||
| Participant 1 | Semantic | M | 20 | 71 | 2 | Sham only | 1 mA | 71.4 | 25 | 57 | 40 | Not assessed | 50 | 50 | Not assessed |
| Participant 2 | Semantic | M | 20 | 73 | 1 | tDCS only | 1 mA | 77 | 25 | 86 | 67 | 80% | 90 | 80 | Not assessed |
| Participant 3 | Logopenic | F | 18 | 72 | 5–10 | tDCS first | 1 mA | 73 | 6 | 100 | 100 | 60% | 75 | 60 | Not assessed |
| Participant 4 | Nonfluent | F | 14 | 69 | 7–9 | Sham first | 1 mA | 43.7 | 39 | 100 | 80 | 0% | 55 | 60 | Severe |
| Participant 5 | Nonfluent | F | 16 | 56 | 5 | Sham first | 2 mA | 61 | 50 | 100 | 100 | 0% | 95 | 60 | Moderate–severe |
| Participant 6 | Logopenic | M | 12 | 73 | 1.5 | Sham first | 2 mA | 81.9 | 19 | 93 | 80 | 40% | 95 | 50 | Not assessed |
| Participant 7 | Nonfluent | M | 19 | 65 | 4.5 | tDCS first | 2 mA | 53.2 | 27 | 100 | 87 | 0% | 80 | 25 | Moderate–Severe |
| Participant 8 | Semantic | F | 14 | 67 | 1.75 | Sham first | 2 mA | 48 | 8 | 93 | 60 | 20% | 85 | 95 | Not assessed |
Note. PPA = primary progressive aphasia; tDCS = transcranial direct current stimulation; WAB-R = Western Aphasia Battery–Revised (Kertesz, 2007); AQ = Aphasia Quotient from the WAB-R; BNT = Boston Naming Test (Kaplan et al., 2001); PPT–Short Form = Pyramids and Palm Trees Test–Short Form (Breining et al., 2015; Howard & Patterson, 1992); KD–Short Form = Kissing and Dancing Test Short Form (Bak & Hodges, 2003); SR = Sentence Repetition test from the National Alzheimer's Coordinating Center's Frontotemporal Dementia Battery from the National Institute on Aging; SOAP = Subject-Relative, Object-Relative, Active, and Passive Test of Sentence Comprehension (Love & Oster, 2002); ABA-2 = Apraxia Battery for Adults–Second Edition (Dabul, 2000); M = male; F = female.