tACS for Working Memory in Schizophrenia
Efficacy and Mechanisms of Transcranial Alternating Current Stimulation in Improving Working Memory in Patients With Schizophrenia
Přehled studie
Postavení
Postavení
Podmínky
Podmínky
Intervence / Léčba
Intervence / Léčba
Detailní popis
Typ studie
Typ studie
Zápis (Odhadovaný)
Zápis
Fáze
Fáze
- Nelze použít
Kontakty a umístění
Studijní kontakt
Studijní kontakt
- Jméno: Renrong Wu
- Telefonní číslo: 15874179855
- E-mail: wurenrong@csu.edu.cn
Studijní místa
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Hunan
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Changsha, Hunan, Čína, 410011
- Nábor
- The Second Xiangya Hospital of Central South University
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Kontakt:
- Jimin Zhang
- Telefonní číslo: 18738858423
- E-mail: zhangjimin@csu.edu.cn
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Kritéria účasti
Kritéria způsobilosti
Kritéria způsobilosti
Věk způsobilý ke studiu
- Dospělý
Přijímá zdravé dobrovolníky
Popis
Inclusion Criteria:
- Aged 18-50 years, meeting the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) diagnostic criteria for schizophrenia, confirmed by the Structured Clinical Interview for DSM-5 (SCID-5).
- Spatial span T-score <40 on the MATRICS Consensus Cognitive Battery (MCCB).
- Taking 1-2 antipsychotic medications, with stable dosage for at least 1 week prior to enrollment. No use of mood stabilizers, antidepressants, or excessive benzodiazepines (lorazepam equivalent >2 mg/day). The type and dosage of antipsychotic medications remain unchanged during the treatment period.
- Impaired functioning in daily activities.
- Willing to participate in this study and provide written informed consent.
Exclusion Criteria:
- Previously diagnosed with or comorbid any other DSM-5 mental disorder besides schizophrenia.
- Presence of significant mood symptoms or substance use disorder (other than caffeine and/or tobacco).
- Presence of any contraindication to transcranial alternating current stimulation (tACS).
- Received other forms of electrical or magnetic stimulation therapy within 1 month prior to enrollment.
- History or current presence of any major physical illness, neurological disorder, or traumatic brain injury that may affect brain structure or function.
- Pregnant or breastfeeding women, or women planning to become pregnant during the study period.
Studijní plán
Jak je studie koncipována?
Detaily designu
- Primární účel: Léčba
- Přidělení: Randomizované
- Intervenční model: Paralelní přiřazení
- Maskování: Singl
Počet zbraní
Zbraně a zásahy
Skupina účastníků / ArmSkupina účastníků / Arm |
Intervence / LéčbaIntervence / Léčba |
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Falešný srovnávač: sham group
sham stimulation
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Sham stimulation provides only a 15-second ramp-up and ramp-down current at the beginning and end of each session to mimic the initial tingling or itching sensation on the scalp produced by real stimulation, but delivers no effective stimulation current during the main phase of the task period.
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Experimentální: active group
transcranial alternating current stimulation
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For montage 1, active electrode at P3 (10-10 system), return electrodes at P1, P5, PO3, CP3.
For montage 2, active electrode at P4, return electrodes at P2, P6, PO4, CP4.
Conductive paste ensures impedance <10 kΩ.
Individual alpha frequency is used, calculated before each session from mean EEG at P3/P4 during SIRP task.
Stimulation intensity is 2 mA (peak-to-zero) via electric field modeling.
Stimulation is delivered during SIRP task, 30 min total per session (including 15s ramp-up/down), with continuous sine wave output.
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Co je měření studie?
Primární výstupní opatření
Primární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
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Working Memory Accuracy
Časové okno: Day 1 (baseline, prior to first intervention); within 15 minutes after Session 1; Day 9 (prior to second intervention, after 7-day washout); within 15 minutes after Session 2.
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Assessment of task accuracy on the Sternberg Item Recognition Paradigm (SIRP).
Participants are required to judge whether a probe stimulus belongs to a previously memorized set, with memory set sizes of 1 and 5.
The outcome is measured as the percentage of correct responses (0-100%) across all trials, with higher scores indicating better working memory performance.
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Day 1 (baseline, prior to first intervention); within 15 minutes after Session 1; Day 9 (prior to second intervention, after 7-day washout); within 15 minutes after Session 2.
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Working Memory Reaction Time
Časové okno: Day 1 (baseline, prior to first intervention); within 15 minutes after Session 1; Day 9 (prior to second intervention, after 7-day washout); within 15 minutes after Session 2.
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Assessment of response speed on the Sternberg Item Recognition Paradigm (SIRP).
Participants are required to judge whether a probe stimulus belongs to a previously memorized set, with memory set sizes of 1 and 5.
The outcome is measured as the mean response latency for correct responses only, calculated from stimulus onset to the participant's button press, with shorter times indicating faster processing speed.
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Day 1 (baseline, prior to first intervention); within 15 minutes after Session 1; Day 9 (prior to second intervention, after 7-day washout); within 15 minutes after Session 2.
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Sekundární výstupní opatření
Sekundární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
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Changes in MCCB Performance
Časové okno: Baseline, on the day after each of the two interventions
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Assessment of cognitive function using the MATRICS Consensus Cognitive Battery (MCCB), a standardized cognitive assessment tool designed for schizophrenia and other neuropsychiatric conditions.
The MCCB evaluates 9 cognitive domains: attention, information processing speed, verbal learning and memory, visual learning and memory, spatial working memory, reasoning and problem solving, social cognition, executive function, and fine motor skills.
The overall cognitive composite score ranges from 20 to 100 (T-score), with higher scores indicating better cognitive performance.
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Baseline, on the day after each of the two interventions
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Changes in Positive and Negative Symptom Scale (PANSS) Scores
Časové okno: Before and one week after each of the two interventions.
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Scores range from 30 to 210, with higher scores indicating more severe positive and negative symptoms.
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Before and one week after each of the two interventions.
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Changes in Scale for the Assessment of Negative Symptoms (SANS) Scores
Časové okno: Before and one week after each of the two interventions.
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Scores range from 0 to 120; higher scores indicate more severe negative symptoms.
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Before and one week after each of the two interventions.
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Changes in Calgary Depression Scale for Schizophrenia (CDSS) Scores
Časové okno: Before and one week after each of the two interventions.
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Scores range from 0 to 27; higher scores indicate more severe affective symptoms.
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Before and one week after each of the two interventions.
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Changes in Brain Function
Časové okno: Baseline, on the day after each of the two interventions.
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Functional magnetic resonance imaging (fMRI), based on blood oxygen level-dependent (BOLD) contrast, can detect changes in blood oxygenation and analyze changes in brain function after intervention.
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Baseline, on the day after each of the two interventions.
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Changes in Neuroelectrophysiological Signals
Časové okno: Baseline, 30 minutes after each of the two interventions.
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Changes in neuroelectrophysiological signals are collected through task-based electroencephalography (EEG).
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Baseline, 30 minutes after each of the two interventions.
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Changes in 40Hz Auditory Steady-State Response (40Hz-ASSR)
Časové okno: Baseline, 30 minutes after each of the two interventions.
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The 40Hz auditory steady-state response recorded by EEG, including evoked power and inter-trial phase coherence, will be measured.
The unit of measurement for evoked power is μV², and for coherence is unitless.
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Baseline, 30 minutes after each of the two interventions.
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Changes in Mismatch Negativity (MMN)
Časové okno: Baseline, 30 minutes after each of the two interventions.
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Mismatch negativity amplitude recorded by EEG using an oddball paradigm will be measured.
The unit of measurement is microvolts (μV).
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Baseline, 30 minutes after each of the two interventions.
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Changes in P300 Event-Related Potential
Časové okno: Baseline, 30 minutes after each of the two interventions.
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P300 amplitude recorded by EEG using an oddball paradigm will be measured.
The unit of measurement is microvolts (μV).
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Baseline, 30 minutes after each of the two interventions.
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Hallucination and Delusion Visual Analog Scale (HD-VAS) Score
Časové okno: Within 15 minutes after completion of Session 1; within 15 minutes after completion of Session 2.
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Assessment of acute post-intervention changes in hallucination and delusion severity using a patient-rated visual analog scale (VAS).
The scale consists of a 0-100 mm horizontal line, on which participants mark their current symptom severity.
The distance (in millimeters) from the left anchor ("no symptoms") to the participant's mark is measured with a ruler.
This scale serves as a supplementary measure to the PANSS to capture immediate symptom changes following each intervention.
Scores range from 0 to 100 mm, with higher scores indicating more severe hallucinations and delusions.
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Within 15 minutes after completion of Session 1; within 15 minutes after completion of Session 2.
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Spolupracovníci a vyšetřovatelé
Sponzor
Sponzor
Termíny studijních záznamů
Hlavní termíny studia
Začátek studia (Odhadovaný)
Začátek studia
Primární dokončení (Odhadovaný)
Primární dokončení
Dokončení studie (Odhadovaný)
Dokončení studie
Termíny zápisu do studia
První předloženo
První předloženo
První předloženo, které splnilo kritéria kontroly kvality
První předloženo, které splnilo kritéria kontroly kvality
První zveřejněno (Aktuální)
První zveřejněno
Aktualizace studijních záznamů
Poslední zveřejněná aktualizace (Aktuální)
Poslední zveřejněná aktualizace
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
Naposledy ověřeno
Naposledy ověřeno
Více informací
Termíny související s touto studií
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