Improved conceptual generation and selection with transcranial direct current stimulation in older adults

Journal of Clinical and Experimental Neuropsychology
Daniel L MaddenGail A Robinson

Abstract

Normal aging is associated with deficits in various aspects of spoken language production, including idea generation and selection, and involves activity in frontal brain areas including left inferior frontal cortex (LIFG). These conceptual preparation processes, largely involving executive control, precede formulation and articulation stages and are critical for language production. Noninvasive brain stimulation (e.g., transcranial direct current stimulation, tDCS) has proven beneficial for age-related fluency and naming deficits, but this has not been extended to conceptual preparation mechanisms. We investigated whether tDCS could facilitate idea generation and selection in 24 older adults aged 60-80 years. In the first phase, participants completed an idea generation test and a selection test with no stimulation. In the second phase they completed an alternate version of the tests in conjunction with either active or sham stimulation. Active stimulation applied 1-mA anodal tDCS over LIFG for the test duration (10 min). Responses were faster following active stimulation than following sham. Furthermore, improvements were specific to test conditions involving novel generation (p = .030) and selection (p = .001) and were not o...Continue Reading

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Citations

Nov 16, 2019·Journal of the International Neuropsychological Society : JINS·Megan S BarkerGail A Robinson

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