Healthy Clinical Trial
— CONTEST_1Official title:
Effects of the Transcranial Alternative Electric Stimulation on the Consciousness Access in Healthy Subjects
The aim of this study is to investigate the effect of transcranial Alternating Current Stimulation (tACS) at theta frequency and the the effect of transcranial Direct Current Stimulation (tDCS) on the conscious access to visual stimuli. tACS and tDCS are non-invasive stimulation techniques that are used to induce brain oscillations at certain frequency or to increase the brain activity in applied region. Healthy participants will perform a behavioral task measuring conscious access (visual backward metacontrast masking task) before, during and after fronto-parietal tACS or tDCS stimulation which will increase neural activity in the two sites. This will allow us to examine online and remaining effects of the stimulation and the causal role of fronto-parietal activity on conscious access.
Status | Recruiting |
Enrollment | 100 |
Est. completion date | October 2020 |
Est. primary completion date | October 2020 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 18 Years to 60 Years |
Eligibility |
Inclusion Criteria: - French social security affiliation - Absence of neurological and psychiatric disorders - Absence of antiepileptic treatment - Normal vision (with or without correction) - Age between 18 and 60 years - Right-handedness - Signed informed consent to participate Exclusion Criteria: - Person under legal protection (legal guardian, tutor, curator) - Past medical history of epilepsy - Past medical history of neurological or psychiatric disorders - Electrical stimulation contraindication (metallic intra-cranial implants, pacemaker or implantable cardioverter-defibrillator, cranial prosthesis) - Antiepileptic and other psychotropes treatment - Pregnant, parturient or breastfeeding women - Left-handedness |
Country | Name | City | State |
---|---|---|---|
France | Institut du Cerveau et de la Moelle - CR-ICM U 975 / UMRS INSERM 1127 | Paris |
Lead Sponsor | Collaborator |
---|---|
Institut National de la Santé Et de la Recherche Médicale, France |
France,
Del Cul A, Baillet S, Dehaene S. Brain dynamics underlying the nonlinear threshold for access to consciousness. PLoS Biol. 2007 Oct;5(10):e260. — View Citation
Polanía R, Nitsche MA, Korman C, Batsikadze G, Paulus W. The importance of timing in segregated theta phase-coupling for cognitive performance. Curr Biol. 2012 Jul 24;22(14):1314-8. doi: 10.1016/j.cub.2012.05.021. Epub 2012 Jun 7. — View Citation
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Change in subjective performance on the behavioral task (% of seen masked target) between before and after stimulation. | Change in the percentage of the correct responses on the subjective evaluation, that is the percentage of seen masked target at each SOA over all masked target presented, between before and after stimulation, for each stimulation modality (inphase theta, antiphase theta, sham). | Measured at each stimulation sessions (three sessions in a randomized cross-over order) for each participant. The three sessions will span in an average of two weeks. | |
Secondary | Change in visual evoked potentials between before and after stimulation. | Change in amplitudes and delays of event related potentials evoked by the target at different SOA and according to the visibility (P1, N1, N2, P300) between before and after stimulation for each stimulation modality. | Measured at each stimulation sessions (three sessions in a randomized cross-over order) for each participant. The three sessions will span in an average of two weeks. | |
Secondary | Change in quantitative EEG measures between before and after stimulation. | Changes in quantitative EEG measures (spectral power, complexity, connectivity) between before and after stimulation for each stimulation modality. | Measured at each stimulation sessions (three sessions in a randomized cross-over order) for each participant. The three sessions will span in an average of two weeks. | |
Secondary | Change in objective performance on the behavioral task (% of correct response on the number comparison task for masked target) between before and after stimulation. | Change in the percentage of the correct responses on the objective comparison task, that is the percentage of correct response on the number comparison task for masked target at each SOA, between before and after stimulation, for each stimulation modality (inphase theta, antiphase theta, sham). | Measured at each stimulation sessions (three sessions in a randomized cross-over order) for each participant. The three sessions will span in an average of two weeks. |
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