DEEPTIME: Human Adaptation in Time Underground Isolation

Sponsor
University Hospital, Caen (Other)
Overall Status
Completed
CT.gov ID
NCT05603780
Collaborator
(none)
15
1
1
12
1.3

Study Details

Study Description

Brief Summary

The objectives of this scientific expedition are: a/ Evaluation of temporal cognitive perception and collective synchronization in a temporally anomalous universe (underground environment), b/ Influence of group living on the endogenous circadian rhythmicity of the central biological clock and peripheral clocks in a "free-running" situation (absence of light/natural darkness), c/Evaluation of cognitive and physiological performance in response to exposure to an extreme environment in a natural underground cavity (cave) without access to a time indicator for 40 days, d/Correlation of cognitive, behavioral, psychological, social, neurophysiological and physiological parameters, e/ Determination of adaptation or maladaptation criteria (biological, genetic, physiological, neurophysiological, psychological and cognitive) in an isolation environment (underground) f/ Study of the evolution of collective organization, decision making and leadership in an extreme isolation and management situation.

Condition or Disease Intervention/Treatment Phase
  • Behavioral: exploratory protocol
N/A

Detailed Description

This exceptional period has shown a significant desynchronization and loss of notion of time in a large number of people as well as important questions about human abilities to live in confined conditions. It is partly for this reason, but also to answer more fundamental questions on the perception of time that the extraordinary research expedition Deep Time was conceived: 40 days underground to know the links of our brain to time and synchronization within a group. A fundamental need for our future. This scientific expedition will take place entirely in France to ensure the feasibility and safety of the subjects and experimenters, under the direction of Christian Clot and the Institute of Human Adaptation, placed under the high patronage of the Ministry of Education, Research and Innovation.

The project addresses the fundamental question of human adaptation to the physical environment and the crucial role of the brain's neuroplasticity properties.

The present "Deep-Time" protocol naturally echoes the "out-of-time" isolation experiments conducted by the speleologist Michel Siffre starting in 1962 and its various components in the years that followed.

These "out of time" experiments led to certain conclusions. As curious as it may seem, in the absence of the time givers (synchronizers or Zeitgebers in German) that are the social rhythms and the day-night alternations, the spontaneous rhythm would settle on a rhythm of about 25 hours.

However, these experiments remained limited to isolated individuals, in conditions of spatial unity (no displacement outside of the work camps), leaving a whole field of research and questioning that the year 2021 has strongly emphasized.

The objectives of this scientific expedition are: a/ Evaluation of temporal cognitive perception and collective synchronization in a temporally anomalous universe (underground environment), b/ Influence of group living on the endogenous circadian rhythmicity of the central biological clock and peripheral clocks in a "free-running" situation (absence of light/natural darkness), c/Evaluation of cognitive and physiological performance in response to exposure to an extreme environment in a natural underground cavity (cave) without access to a time indicator for 40 days, d/Correlation of cognitive, behavioral, psychological, social, neurophysiological and physiological parameters, e/ Determination of adaptation or maladaptation criteria (biological, genetic, physiological, neurophysiological, psychological and cognitive) in an isolation environment (underground) f/ Study of the evolution of collective organization, decision making and leadership in an extreme isolation and management situation.

Study Design

Study Type:
Interventional
Actual Enrollment :
15 participants
Allocation:
N/A
Intervention Model:
Single Group Assignment
Intervention Model Description:
Follow-up of one group of healthy participant to 40days in a contraint underground environmentFollow-up of one group of healthy participant to 40days in a contraint underground environment
Masking:
None (Open Label)
Primary Purpose:
Basic Science
Official Title:
Cognitive, Emotional, Physiological, Chronobiological and Genetic Effects of a Time Underground Isolation
Actual Study Start Date :
Mar 11, 2021
Actual Primary Completion Date :
Sep 11, 2021
Actual Study Completion Date :
Mar 11, 2022

Arms and Interventions

Arm Intervention/Treatment
Other: group 1

one cohort

Behavioral: exploratory protocol
physiological and cognitive evaluations

Outcome Measures

Primary Outcome Measures

  1. Time [every ten days up to 40 days]

    - Evaluation of time perception perceived by subjects (minute and days) every 10 days up to 40 days

  2. chronobiology [every 5 days up to 40 days]

    -Influence of group living on the endogenous circadian rhythmicity of the central biological clock and peripheral clocks in a "free-running" situation (absence of light / natural darkness): measurments of body core temperature, cortisol and melatonine salivary concentration circadian rythms

  3. Human Factors: ethological measurments with video 24/24, actimetric circadian rythms [all along the cavern experiment for 40 days]

    - Evaluation of the capacity of a group to find a synchronicity and a way of life in a new context, extreme in its environmental and temporal dimensions and out of the initial competences of each group member. Measurments of social interaction, comparison of actimetric circadien rythm

  4. Physiology [every ten days up to 40 days]

    Physiological parameters (HRV, lean and fat mass by impedancemtry, weight in kg, core body temperature) in response to exposure to an extreme environment in a natural underground cave for 40 days.

  5. Cognition, Emotion and personnality [every ten to 15 days up to 40 days]

    Evaluation of cognitive (taking decision, emotion, spatial cognition) through differents paradigms displayed on screen of Headset in 2D and 3D virtual reality. Mesurements of time reaction, risk score, number of strategy or procedural errors, time to achieve the tasks. Questionnaires (STAI, POMS, big five inventory, IP9)

Eligibility Criteria

Criteria

Ages Eligible for Study:
25 Years to 50 Years
Sexes Eligible for Study:
All
Accepts Healthy Volunteers:
Yes
Inclusion Criteria:

Strictly right-handed Good health without any medical and psychiatric diseases No contraindications to MRI French or European nationality Not to be included in another biomedical protocol

Exclusion Criteria:

Being pregnant Minor, under guardianship or curatorship

Contacts and Locations

Locations

Site City State Country Postal Code
1 CHU CAEN Caen France

Sponsors and Collaborators

  • University Hospital, Caen

Investigators

  • Principal Investigator: stephane besnard, MD, CaenHU

Study Documents (Full-Text)

None provided.

More Information

Additional Information:

Publications

None provided.
Responsible Party:
University Hospital, Caen
ClinicalTrials.gov Identifier:
NCT05603780
Other Study ID Numbers:
  • 2021-A00747-37
  • 27/21_2
First Posted:
Nov 3, 2022
Last Update Posted:
Nov 3, 2022
Last Verified:
Aug 1, 2022
Studies a U.S. FDA-regulated Drug Product:
No
Studies a U.S. FDA-regulated Device Product:
No
Keywords provided by University Hospital, Caen
Additional relevant MeSH terms:

Study Results

No Results Posted as of Nov 3, 2022