tACS for Working Memory in Schizophrenia
Efficacy and Mechanisms of Transcranial Alternating Current Stimulation in Improving Working Memory in Patients With Schizophrenia
Studieoversigt
Status
Status
Betingelser
Betingelser
Intervention / Behandling
Intervention / Behandling
Detaljeret beskrivelse
Undersøgelsestype
Undersøgelsestype
Tilmelding (Anslået)
Tilmelding
Fase
Fase
- Ikke anvendelig
Kontakter og lokationer
Studiekontakt
Studiekontakt
- Navn: Renrong Wu
- Telefonnummer: 15874179855
- E-mail: wurenrong@csu.edu.cn
Studiesteder
-
-
Hunan
-
Changsha, Hunan, Kina, 410011
- Rekruttering
- The Second Xiangya Hospital of Central South University
-
Kontakt:
- Jimin Zhang
- Telefonnummer: 18738858423
- E-mail: zhangjimin@csu.edu.cn
-
-
Deltagelseskriterier
Berettigelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
- Voksen
Tager imod sunde frivillige
Beskrivelse
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.
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Behandling
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Enkelt
Antal våben
Våben og indgreb
Deltagergruppe / ArmDeltagergruppe / Arm |
Intervention / BehandlingIntervention / Behandling |
|---|---|
|
Sham-komparator: sham group
sham stimulation
|
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.
|
|
Eksperimentel: active group
transcranial alternating current stimulation
|
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.
|
Hvad måler undersøgelsen?
Primære resultatmål
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
Working Memory Accuracy
Tidsramme: 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.
|
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.
|
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.
|
|
Working Memory Reaction Time
Tidsramme: 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.
|
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.
|
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.
|
Sekundære resultatmål
Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
Changes in MCCB Performance
Tidsramme: Baseline, on the day after each of the two interventions
|
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.
|
Baseline, on the day after each of the two interventions
|
|
Changes in Positive and Negative Symptom Scale (PANSS) Scores
Tidsramme: Before and one week after each of the two interventions.
|
Scores range from 30 to 210, with higher scores indicating more severe positive and negative symptoms.
|
Before and one week after each of the two interventions.
|
|
Changes in Scale for the Assessment of Negative Symptoms (SANS) Scores
Tidsramme: Before and one week after each of the two interventions.
|
Scores range from 0 to 120; higher scores indicate more severe negative symptoms.
|
Before and one week after each of the two interventions.
|
|
Changes in Calgary Depression Scale for Schizophrenia (CDSS) Scores
Tidsramme: Before and one week after each of the two interventions.
|
Scores range from 0 to 27; higher scores indicate more severe affective symptoms.
|
Before and one week after each of the two interventions.
|
|
Changes in Brain Function
Tidsramme: Baseline, on the day after each of the two interventions.
|
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.
|
Baseline, on the day after each of the two interventions.
|
|
Changes in Neuroelectrophysiological Signals
Tidsramme: Baseline, 30 minutes after each of the two interventions.
|
Changes in neuroelectrophysiological signals are collected through task-based electroencephalography (EEG).
|
Baseline, 30 minutes after each of the two interventions.
|
|
Changes in 40Hz Auditory Steady-State Response (40Hz-ASSR)
Tidsramme: Baseline, 30 minutes after each of the two interventions.
|
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.
|
Baseline, 30 minutes after each of the two interventions.
|
|
Changes in Mismatch Negativity (MMN)
Tidsramme: Baseline, 30 minutes after each of the two interventions.
|
Mismatch negativity amplitude recorded by EEG using an oddball paradigm will be measured.
The unit of measurement is microvolts (μV).
|
Baseline, 30 minutes after each of the two interventions.
|
|
Changes in P300 Event-Related Potential
Tidsramme: Baseline, 30 minutes after each of the two interventions.
|
P300 amplitude recorded by EEG using an oddball paradigm will be measured.
The unit of measurement is microvolts (μV).
|
Baseline, 30 minutes after each of the two interventions.
|
|
Hallucination and Delusion Visual Analog Scale (HD-VAS) Score
Tidsramme: Within 15 minutes after completion of Session 1; within 15 minutes after completion of Session 2.
|
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.
|
Within 15 minutes after completion of Session 1; within 15 minutes after completion of Session 2.
|
Samarbejdspartnere og efterforskere
Sponsor
Sponsor
Datoer for undersøgelser
Studer store datoer
Studiestart (Anslået)
Studiestart
Primær færdiggørelse (Anslået)
Primær færdiggørelse
Studieafslutning (Anslået)
Studieafslutning
Datoer for studieregistrering
Først indsendt
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først indsendt, der opfyldte QC-kriterier
Først opslået (Faktiske)
Først opslået
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Faktiske)
Sidste opdatering sendt
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
Andre undersøgelses-id-numre
- LYG20260081
Plan for individuelle deltagerdata (IPD)
Planlægger du at dele individuelle deltagerdata (IPD)?
Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter
Studerer et amerikansk FDA-reguleret lægemiddelprodukt
Studerer et amerikansk FDA-reguleret enhedsprodukt
Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .