Transcranial direct current stimulation in post stroke aphasia and primary progressive aphasia: Current knowledge and future clinical applications…
During transcranial direct current stimulation (tDCS), a low-intensity direct electrical current is applied to the scalp to influence the electrical activity in the underlying cortex. In most cases, the tDCS is applied at an amperage insufficient to cause neurons to generate action potentials (i.e., 1-2 mA); rather, it provides sub- threshold electrical modulation, which increases or decreases the likelihood of an action potential to occur.
Following a stroke, people often experience difficulty with speaking, reading, writing or comprehension. This acquired language impairment is called aphasia which is a debilitating language disorder for which behavioral speech therapy is the most efficient treatment, but therapy outcomes are variable and full recovery is not always achieved.
It remains unclear if tDCS during aphasia therapy can improve outcomes which is what the below mentioned study considers.
Link to study: tDCSAphasia