- ICH GCP
- Rejestr badań klinicznych w USA
- Badanie kliniczne NCT07625566
Anodal tDCS Over Left PPC Enhances Visuospatial Attention and Alpha Power Among Young Adults
Background: Visuospatial attention enables individuals to detect and process relevant stimuli efficiently. The posterior parietal cortex (PPC), a core hub of the dorsal attention network, exerts top-down control over visual scanning and is closely linked to alpha-band oscillations (8-13 Hz), which index attentional allocation and inhibition of distractors. Transcranial direct current stimulation (tDCS) offers a noninvasive method to alter cortical excitability transiently, but evidence for its effects on PPC-mediated attention and alpha power remains mixed.
Objective: This randomized, single-blind trial examined whether anodal tDCS over the left PPC modulates visuospatial attention and resting-state alpha power in young adults, and whether EEG changes predict behavioral performance.
Method: Thirty-two healthy participants (18-40 years) were randomized to anodal (2 mA, 20 min; n=15) or sham (n=17) stimulation. Cancellation Test performance and resting-state EEG were assessed pre- and post-stimulation. EEG analyses focused on artifact-free alpha power; regression models probed associations between neural and behavioral changes.
Przegląd badań
Status
Warunki
Interwencja / Leczenie
Typ studiów
Zapisy (Rzeczywisty)
Faza
- Nie dotyczy
Kontakty i lokalizacje
Lokalizacje studiów
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İ̇stanbul
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Beykoz, İ̇stanbul, Turcja (Türkiye), 34820
- Istanbul Medipol University
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Kryteria uczestnictwa
Kryteria kwalifikacji
Wiek uprawniający do nauki
- Dorosły
Akceptuje zdrowych ochotników
Opis
Inclusion Criteria:
- Age between 18 and 40 years
- Score of 21 or higher on the Montreal Cognitive Assessment Scale (MoCA)
Exclusion Criteria:
- History of neurological or psychiatric illness
- Uncorrected visual impairments
- MoCA score of 21 or lower
- Use of medications affecting cortical excitability
- History of seizures or epilepsy
- Presence of intracranial metal objects, implanted stimulating devices, or pacemakers
Plan studiów
Jak projektuje się badanie?
Szczegóły projektu
- Główny cel: Podstawowa nauka
- Przydział: Randomizowane
- Model interwencyjny: Przydział równoległy
- Maskowanie: Pojedynczy
Broń i interwencje
Grupa uczestników / Arm |
Interwencja / Leczenie |
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Eksperymentalny: Anodal tDCS Group
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Anodal tDCS Protocol: In the Anodal tDCS participant group, a direct current of 2 mA was applied for 20 minutes in accordance with the safety guidelines.
To provide cortical stimulation, the superficial anodal electrode of the device was placed on the P3 region (left PPC), which is located in the left superior parietal lobe, corresponds to Brodmann area (BA) 40, and is associated with the dorsal visual pathway according to the international 10-20 EEG system.
The reference electrode was placed on the contralateral (opposite) shoulder.
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Pozorny komparator: Sham tDCS Group
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Sham tDCS Protocol: The anode superficial electrode of the device was placed on the P3 region (left PPC), located in the left superior parietal lobe, corresponding to Brodmann area (BA) 40, and associated with the dorsal visual pathway according to the international 10-20 EEG system.
The reference electrode was placed on the contralateral (opposite) shoulder.
In the Sham tDCS group, a single 20-minute sham session was administered over the left posterior parietal cortex (P3) without delivering current, in accordance with the safety guidelines.
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Co mierzy badanie?
Podstawowe miary wyniku
Miara wyniku |
Opis środka |
Ramy czasowe |
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EEG recording and power in alpha band
Ramy czasowe: Before and immediately after applying tDCS
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EEG recordings were acquired in a semi-dark, electrically shielded Faraday room using a BrainAmp 32-Channel DC System (Brain Products, Munich, Germany).
Signals were sampled at 500 Hz with a 0.01-250 Hz bandpass filter and recorded using BrainVision Recorder software.
A 32-channel Ag/AgCl electrode cap (Easycap) was positioned according to the international 10-20 system.
Resting-state EEG data were collected for 4 minutes with eyes open and 4 minutes with eyes closed.
Numerical evaluation of artifact-free EEG data for power density calculation is performed using Fast Fourier Transform (FFT) with 0.5 Hz frequency resolution, and alpha (8-13 Hz) bands were calculated and then averaged over these power spectrum values.
The amplitude values, measured from peak to peak, were recorded for each individual, and the necessary data for statistical analysis were collected.
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Before and immediately after applying tDCS
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Cancellation Test
Ramy czasowe: Before and immediately after applying tDCS
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The Cancellation Test is one of the most widely used tools for assessing visuospatial attention.
IT consists of four subtests arranged on A4-sized sheets.
Each subtest includes 60 target stimuli distributed among 300 total stimuli.
For each subtest, separate scores are calculated for the right and left sides, including the number of correctly marked targets (IT1), omitted targets (IT2), incorrectly marked letters/shapes (IT3), total error score (IT4), and scanning time (IT5).
The total error score is calculated as the sum of omitted targets and incorrectly marked letters/shapes.
Achieving a high score (i.e., a high number of correctly marked targets and a low number of errors) and a short completion time (time score) indicate better performance.
İn the present study, the paper-and-pencil version of the Cancellation Test was chosen to reliably assess visuospatial attention and subtle tDCS-induced changes.
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Before and immediately after applying tDCS
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Współpracownicy i badacze
Sponsor
Śledczy
- Dyrektor Studium: Lütfü Hanoğlu, Professor, Medipol University
- Krzesło do nauki: Mevhibe Sarıcaoğlu, PhD, Medipol University
- Dyrektor Studium: Miray Budak, PhD, Rutgers University-Newark
- Krzesło do nauki: Fatma Aydın, MsC, Medipol University
Daty zapisu na studia
Główne daty studiów
Rozpoczęcie studiów (Rzeczywisty)
Zakończenie podstawowe (Rzeczywisty)
Ukończenie studiów (Rzeczywisty)
Daty rejestracji na studia
Pierwszy przesłany
Pierwszy przesłany, który spełnia kryteria kontroli jakości
Pierwszy wysłany (Rzeczywisty)
Aktualizacje rekordów badań
Ostatnia wysłana aktualizacja (Rzeczywisty)
Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości
Ostatnia weryfikacja
Więcej informacji
Terminy związane z tym badaniem
Dodatkowe istotne warunki MeSH
Inne numery identyfikacyjne badania
- E-10840098-772.02-605
Plan dla danych uczestnika indywidualnego (IPD)
Planujesz udostępniać dane poszczególnych uczestników (IPD)?
Informacje o lekach i urządzeniach, dokumenty badawcze
Bada produkt leczniczy regulowany przez amerykańską FDA
Bada produkt urządzenia regulowany przez amerykańską FDA
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