The purpose of the study is to test whether low level electric stimulation, called transcranial Direct Current Stimulation (tDCS), on the part of the brain (i.e., pre-supplementary motor area and left inferior frontal gyrus) thought to aid in memory will improve speech and language difficulties in patients with primary progressive aphasia (PPA) and progressive apraxia of speech (PAOS). The primary outcome measures are neuropsychological assessments of speech and language functions, and the secondary measures are neuropsychological assessments of other cognitive abilities and electroencephalography (EEG) measures.
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The Controlled Oral Word Association Test
Timeframe: Treatment change from Baseline to Immediate post, and 8 weeks post treatment completion.
Category Fluency
Timeframe: Treatment change from Baseline to Immediate post, and 8 weeks post treatment completion.
The Boston Naming Test
Timeframe: Treatment change from Baseline to Immediate post, and 8 weeks post treatment completion.
Spontaneous speech (content and fluency) of the Western Aphasia Battery-Revised
Timeframe: Treatment change from Baseline to Immediate post, and 8 weeks post treatment completion.
The Apraxia battery for Adults - 2 (ABA - 2)
Timeframe: Treatment change from Baseline to Immediate post, and 8 weeks post treatment completion.