Working… Menu

Effects of Brain Stimulation During Daytime Nap on Memory Consolidation in Younger, Healthy Subjects

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01840865
Recruitment Status : Completed
First Posted : April 26, 2013
Last Update Posted : March 16, 2016
Information provided by (Responsible Party):
Agnes Flöel, Charite University, Berlin, Germany

Brief Summary:
The beneficial effect of daytime sleep on memory consolidation has been shown in young, healthy subjects. Especially, periods rich in slow-wave sleep (SWS) have shown a memory enhancing effect on hippocampus-dependent declarative memory. Slow oscillatory activity typically occuring during SWS has been implicated in the consolidation effect. In this study we investigate if the consolidation effect can be amplified by the application of a weak transcranial oscillatory electric current within the frequency range of SWS in humans (0,7-0,8 Hz) during daytime SWS.

Condition or disease Intervention/treatment Phase
Healthy Subjects Device: brain stimulation Device: no stimulation Not Applicable

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 22 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple (Participant, Care Provider, Investigator)
Primary Purpose: Treatment
Official Title: Impact of Transcranial Slow Oscillating Stimulation on Memory Consolidation During Daytime Slow Wave Sleep in Younger, Healthy Subjects
Study Start Date : October 2013
Actual Primary Completion Date : January 2015
Actual Study Completion Date : January 2015

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Memory

Arm Intervention/treatment
Experimental: SHAM stimulation
SHAM stimulation during periods of Slow Wave Sleep
Device: no stimulation
sham Stimulation

Experimental: 0,75 Hz stimulation
slow transcranial oscillating stimulation (~0,75Hz) during periods of Slow Wave Sleep
Device: brain stimulation
oscillating direct current brain stimulation

Primary Outcome Measures :
  1. Retention of declarative memories after 0.75 Hz stimulation during SWS, vs after sham stimulation during SWS [ Time Frame: 4 weeks ]
    Retention between stimulation conditions (0.75 Hz during SWS, vs sham stimulation during SWS) in the declarative memory task.

Secondary Outcome Measures :
  1. Amount of Slow wave Sleep [ Time Frame: 4 weeks ]
    1. Amount of slow wave sleep assessed by standard polysomnographic criteria in 0,75 Hz vs SHAM stimulation during SWS.

  2. 2. sleep spindles [ Time Frame: 4 weeks ]
    2. Spindle activity during sleep indicated via several spindle parameters like number, duration, frequency of spindles; compared between 0,75 Hz and SHAM stimulation during SWS.

  3. 3. EEG-correlates [ Time Frame: 4 weeks ]
    3. Neuronal correlates (EEG-power in slow oscillation frequency bands induced by 0,75 Hz vs SHAM stimulation during SWS; EEG-correlates of encoding and retrieval of a declarative memory task).

  4. 4. further memory systems [ Time Frame: 4 weeks ]
    4. Performance in further memory systems (procedural), compared between 0,75 Hz and SHAM stimulation during SWS.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   18 Years to 35 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • healthy Subjects
  • unobtrusive, neuropsychological screening
  • age: 18-35 years
  • right handed

Exclusion Criteria:

  • untreated severe internal or psychiatric diseases
  • epilepsy
  • other severe neurological diseases eg., previous major stroke, brain tumour
  • contraindications to MRI

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01840865

Layout table for location information
Charite CCM Neurologie Berlin
Berlin, Germany, 10117
Sponsors and Collaborators
Charite University, Berlin, Germany
Layout table for investigator information
Principal Investigator: Agnes Flöel, Professor Charite Universitätsmedizin Berlin - Neurologie