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There are two opposing hypotheses, namely the interference and laterality-shift hypotheses, regarding the role of the right hemisphere (RH) in language recovery following a left hemisphere damage. Transcranial direct current stimulation (tDCS) has received increasing attention as a potential complement to behavioural therapy.
This preliminary study aimed to examine the effect of excitatory (anodal) stimulation of right inferior frontal gyrus (IFG) on naming abilities of chronic people with aphasia (PWA) to examine the compensatory versus interference role of RH in language recovery, and to confirm the application of tDCS does not induce adverse effects on other cognitive and language functions.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| anodal tDCS | Active Comparator | 20 minutes of one mA anodal High-Definition tDCS (HD-tDCS) over right IFG combined with 40 minutes of naming therapy for five consecutive days in week 1 |
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| sham tDCS | Sham Comparator | 20-minutes sham HD-tDCS with 40-minutes therapy of naming therapy for five consecutive days in week 1 |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| tDCS stimulation | Device | The study examines the effect of excitatory stimulation of right inferior frontal gyrus (IFG) on naming abilities of people with aphasia (PWA) as compared to sham stimulation to examine the compensatory versus interference role of right hemisphere in language recovery after stroke. |
| Measure | Description | Time Frame |
|---|---|---|
| Picture naming task | One hundred and sixty pictures of concrete nouns from the Snodgrass and Vanderwart (1980) picture set (colored version) were utilised to measure the percentage of object naming accuracy. In particular, these pictures were divided into Set A (training targets) and Set B (untrained generalization targets), with eighty stimuli in each set. | Immediately after the end of each treatment session and block |
| Measure | Description | Time Frame |
|---|---|---|
| language task | * Overall language skills are measured through the overall aphasia scores provided by the Cantonese version of Western Aphasia Battery (short-form). The scale is called Aphasia quotient: Minimum value = 0, maximum value = 100, with higher scores mean a better performance. | Immediately after the end of each treatment block |
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Inclusion Criteria:
Exclusion Criteria:
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| ID | Term |
|---|---|
| D001037 | Aphasia |
| ID | Term |
|---|---|
| D013064 | Speech Disorders |
| D007806 | Language Disorders |
| D003147 | Communication Disorders |
| D019954 | Neurobehavioral Manifestations |
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| ID | Term |
|---|---|
| D065908 | Transcranial Direct Current Stimulation |
| D007808 | Language Therapy |
| ID | Term |
|---|---|
| D004599 | Electric Stimulation Therapy |
| D013812 | Therapeutics |
| D003295 | Convulsive Therapy |
| D013000 | Psychiatric Somatic Therapies |
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| Cognitive task |
The cognitive skills are measured through the subtest scores provided by Oxford Cognitive Screening-Cantonese. The test uses different sub-tests including the Picture naming, Semantics, Orientation, Visual field task, Sentence reading , Calculation, Attention, Praxis, Memory, and Executive tasks. The range of values varies across the subtests. For all subtests except the executive task, the higher scores reflect better performance. For executive tasks the lower scores reflect better performance. |
| Immediately after the end of each treatment block |
| D009461 | Neurologic Manifestations |
| D009422 | Nervous System Diseases |
| D012816 | Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |
| D004191 | Behavioral Disciplines and Activities |
| D004597 | Electroshock |
| D011580 | Psychological Techniques |
| D012049 | Rehabilitation of Speech and Language Disorders |
| D012046 | Rehabilitation |
| D000359 | Aftercare |
| D003266 | Continuity of Patient Care |
| D005791 | Patient Care |