COMPARE: MIR  AQUANAUTS WITH EXPERIMENT 10 BELOW.                                                     TO :  MIR AQUANAUTS

EXPERIMENT 10.                                                          BACK TO :   BRAIN  IN  BRAIN  UNDERSEA LAB
SEA BED HABITAT (UNDERSEA LAB)

APPARATUS USED IS DESCRIBED UNDER :
13. APPARATUS AND REGISTRATION

UNDERSEA LABORATORY HELGOLAND .

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ASSESSMENT OF THE EFFECT OF NITROGEN SATURATION ON THE MINDS OF ROYAL DUTCH NAVY AQUANAUTS LIVING IN A LABORATORY AT THE BOTTOM OF THE SEA NEAR TRAVEMÜNDE (GERMANY).
POPULAR AND ABSTRACTED VERSION. COPYRIGHT © DRS J. P. KROL, EXPERIMENTAL NEUROPSYCHOLOGIST. 7TH JUNE 2002 12:00 c.e.t. 

IT IS WELL KNOWN THAT WHEN DIVERS STAY UNDER WATER BELOW A CERTAIN DEPTH FOR A PROLONGED PERIOD RETURN TO THE SURFACE HAS TO BE EXECUTED IN STAGES.

MORE AND LONGER STAGES ARE REQUIRED WHEN THEY STAY LONGER AT DEPTH.

HOWEVER, AFTER A CERTAIN PERIOD AT A PARTICULAR DEPTH THE BODY GETS ADAPTED TO THAT PARTICULAR DEPTH (NITROGEN SATURATION).

WHEN THIS OCCURS IT NO LONGER MATTERS HOW LONG THE AQUANAUT STAYS DOWN THERE.

THIS IS WHY IT CAN BE PRACTICAL TO KEEP DIVERS UNDER PRESSURE (e.g. IN HABITATS) WHEN THEY HAVE TO WORK AT DEPTH FOR EXTENDED PERIODS RATHER THEN DECOMPRESSING THEM DAILY.

WE WANTED TO KNOW IF THIS TYPE OF ADAPTATION HAD ANY EFFECT ON EFFECTIVE FUNCTIONING OF THE MIND OF AQUANAUTS LIVING IN AN UNDERSEA LABORATORY AND MAKING TRIPS FROM THERE TO WORK ON THE SEABED OUTSIDE.

TO FIND THIS OUT WE HAD NITROGEN SATURATED DIVERS LIVING INSIDE THE LABORATORY MAKE TRIPS TO THE SEABED OUTSIDE AND THEN WORK THERE WHILE THEIR REACTIONS WHERE ACCURATELY REGISTERED AND STORED ELECTRONICALLY BY A TEAM INSIDE THE LABORATORY.

 

MATERIAL AND METHODS.

TO ASSESS THIS WE USED THE BINARY CHOICE GENERATOR WITH MODIFIED LONG DISTANCE STIMULUS RESPONSE UNIT AS DESCRIBED UNDER APPARATUS AND REGISTRATION.

BEFORE THE UNDERSEA LABORATORY EXPERIMENT THE SUITABILITY OF THE METHOD AND THE BEST PROCEDURES HAD BEEN WORKED OUT IN THE DEPTH SIMULATOR WITH DIVERS UNDER WATER AT A DEPTH OF 90 METERS (SEE EXPERIMENT 12).

IN THE DEPTH SIMULATOR EXPERIMENTS THE ASSUMPTION WAS THAT THE MINDS OF DIVERS WORKING UNDER WATER AT A PRESSURE OF TEN ATMOSPHERE ON NORMAL AIR WOULD BE AFFECTED AND THAT THIS WOULD HAVE TO BE CLEAR FROM THEIR PERFORMANCE ON THE LDSR UNIT.

IN THE DEPTH SIMULATOR EXPERIMENTS THE CONDITIONS WERE THE CRITERION AND THE LDSR PERFORMANCE WAS THE MEASURE BEING DEVELOPED.

IN THE UNDERSEA LABORATORY EXPERIMENTS THE LDSR PERFORMANCE WAS THE CRITERION, NOW USED AS THE MEASURE TO SEE IF THE CONDITIONS WITH ADAPTED DIVERS IN AND OUTSIDE THE UNDERSEA LABORATORY WOULD BE DIFFERENT.

WE COULD DO THIS BECAUSE IT HAD FIRST BEEN PROVEN THAT THE LDSR PERFORMANCE WAS SENSITIVE TO PERFORMANCE DETERIORATION AND USEABLE UNDER MORE OR LESS COMPARABLE CONDITIONS.

FIGURE 1 SHOWS THE SITUATION WITH THE UNDERSEA LABORATORY

 

 

 

 

 

 

FIGURE 2 SHOWS A COMPARTMENT INSIDE THE LABORATORY.

 

 

 

 

 

 

 

 

 

 

 

 

 

RESULTS.

FIGURES 3 pp1 pp2 pp3 SHOWS THE AVERAGE VALUES OF 3 MINUTES OF REGISTRATION PER CONDITION FOR 3 SUBJECTS AND pp1,2,3 gives the averages of the 3 subjects combined.

CONDITIONS ARE :

H : RELAXED, IN THE HOTEL ROOM, BEFORE SUBMERSION

U : AFTER ARRIVAL IN THE UNDERSEA LABORATORY

Z1 : THE NEXT DAY ON THE SEABED OUTSIDE THE LABORATORY

Z2 : THE FOLLOWING DAY ON THE SEABED OUTSIDE THE LABORATORY

ON THE VERTICAL AXIS (ABKG prestatie@) THE LDSR PERFORMANCE (with variance) IS DISPLAYED AS A SINGLE FIGURE (obtained by discriminant analyses applied to the results from the depth simulator experiments).

(THE GRAPHS AND THE DUTCH TEXT BELOW ARE FROM THE ORIGINAL REPORT BY THE AUTHOR, WHICH WAS COPIED AND THEN PASTED INTO THIS WEB TEXT.) 

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CONCLUSIONS

ONLY IN CONDITION U, INSIDE THE LABORATORY (AFTER ARRIVAL ) PERFORMANCE IS INFERIOR TO THE OPTIMAL (CONTROL) CONDITION IN THE HOTEL ROOM (=H).

WORKING ON THE SEABED OUTSIDE THE LABORATORY DOES NOT SEEM TO AFFECT THE NITROGEN SATURATED DIVERS .

THEY WORK JUST AS GOOD ON THE SEABED OUTSIDE THE LAB AND BEING SATURATED WITH NITROGEN, AS THEY WORKED IN THE HOTEL ROOM UNDER COMPLETELY RELAXED CONDITIONS.

 

DISCUSSION

 THE FOLLOWING POINTS MUST BE CONSIDERED:

1. WE ARE TALKING ABOUT AN EXPERIMENT WITH ONLY 3 SUBJECTS.  THESE RESULTS CAN NOT AT THIS STAGE BE USED TO MAKE GENERAL STATEMENTS ABOUT NITROGEN SATURATED AQUANAUTS WORKING ON THE SEABED OUTSIDE THEIR HABITATS.

2. ON THE OTHER HAND IT MAY ALSO BE CONSIDERED THAT THIS  (OPTIMAL) PERFORMANCE LEVEL WAS NOT SIGNIFICANTLY DIFFERENT FROM THE AVERAGE OPTIMAL PERFORMANCE LEVEL OF THE SUBJECTS IN OUR 90 METERS DEPTH SIMULATOR EXPERIMENT .   THIS WAS BASED ON 15 REGISTRATIONS.

3. THE REGISTRATION SHORTLY AFTER ARRIVAL INSIDE THE LAB HAD BEEN MADE BECAUSE THE PHYSICIAN WHICH WAS PERMANENTLY ATTACHED TO THE LAB HAD SAID AQUANAUTS WHERE USUALLY A LITTLE CONFUSED THE FIRST DAY AFTER ARRIVAL.  THE REGISTRATION AFTER ARRIVAL INSIDE THE LAB ARE IN CONCURRENCE WITH THIS STATEMENT. 

4. THIS METHOD WITH RELATED EXPERIMENTS WAS INTRODUCED BY THE AUTHOR ON VARIOUS WORLD CONGRESSES OF AVIATION AND AEROSPACE MEDICINE AND UNDERSEA MEDICINE, INCLUDING SUGGESTED USE IN SPACE AND SPACE SIMULATORS.

 EXPERIMENTING WITH HUMAN MINDS AND HUMAN BRAINS :
Validation of constructs II  "MAIN PAGE"

APPARATUS USED IS DESCRIBED UNDER :
13. APPARATUS AND REGISTRATION

Copyright drs j. p. krol (diver / exp.neuropsychologist) ©