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Updated: Jul 6, 2026
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Transcranial Direct Current Stimulation and Simultaneous Functional Magnetic Resonance Imaging
Published on: April 27, 2014
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Effects of Transcranial Direct Current Stimulation on Rapid Automatized Naming Performance in Healthy Individuals
Özlem Öge-Daşdöğen1, R Gülşah Özer2, Gökçer Eskikurt3,4
1Department of Speech and Language Therapy, Faculty of Health Sciences, Atlas University, Istanbul, Turkey.
Journal of Speech, Language, and Hearing Research : JSLHR
|December 29, 2025
Summary
Anodal transcranial direct current stimulation (tDCS) improved rapid automatized naming (RAN) speed in healthy adults. Conversely, cathodal tDCS slowed performance, suggesting temporal measures are sensitive to neurostimulation effects.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neuromodulation
Background:
- Rapid Automatized Naming (RAN) assesses speed and accuracy in naming visual stimuli, crucial for phonological processing and language production.
- Transcranial Direct Current Stimulation (tDCS) is a non-invasive brain stimulation technique used to modulate cortical excitability.
- Understanding the impact of tDCS on cognitive tasks like RAN can inform therapeutic interventions for language and reading disorders.
Purpose of the Study:
- To investigate the effects of anodal, cathodal, and sham tDCS on RAN performance in healthy young adults.
- To determine if tDCS can modulate specific temporal aspects of naming, such as vocal reaction time (vRT) and task completion time (TCT).
- To assess the sensitivity of different RAN measures (accuracy vs. temporal) to neurostimulation.
Main Methods:
- Sixty healthy, right-handed young adults participated and were randomly assigned to anodal, cathodal, or sham tDCS groups.
- A 20-minute tDCS session was applied targeting the left temporo-parieto-occipital junction.
- RAN performance was measured using accuracy, vRT, and TCT across color, number, letter, and combination subtasks before and after stimulation.
Main Results:
- Anodal tDCS significantly reduced vRT for color naming and TCT across all RAN subtasks.
- Cathodal tDCS significantly increased vRT for color naming and TCT for letter and combination subtasks.
- Sham tDCS showed no significant effects on RAN performance, serving as a control.
Conclusions:
- Anodal tDCS enhances RAN performance, particularly by improving speed (reducing TCT) and selectively affecting vRT.
- Cathodal tDCS appears to impair performance in specific RAN subtasks, indicating differential effects based on stimulation polarity.
- Temporal measures like TCT are more sensitive than accuracy in detecting tDCS effects in healthy individuals, highlighting RAN's potential for cognitive-linguistic disorder assessment.
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