認知心理学研究8(1): 63-72 (2010)

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The e#ect of long-term exposure to a hyperbaric environment on cognitive performance

Nozomu KAGEYAMA (Department of Psychology, Graduate School of Human-Environment Studies,Kyushu University)Yuji HAKODA (Faculty of Human-Environment Studies, Kyushu University)Koji OZAWA (Undersea Medical Center, Japan Maritime Self Defense Force)

When people work at deep sea locations, they are always exposed to hyperbaric environments.For example, an environmental pressure of 440 MSW (meters of sea water) is equivalent to 45times the atmospheric pressure (45 ATA: atm absolute). In this study, we examine the e#ects of long-term exposure to hyperbaric environments on cognitive performance using the Stroop and the re-verse-Stroop Color-Word interference tests (group version) and two psychological stress question-naires. These tests were administrated during a simulated 440 MSW saturation dive. Twenty-fourprofessional male divers (age: 36�2.82) served as the participants. The level of Stroop interferenceduring the dive period was highest at the maximum environmental pressure. In contrast, psycholog-ical stress was not detected throughout the dive. These results indicate that the magnitude of en-vironmental pressure rather than psychological stress caused the increase in Stroop interference.We argue that cognitive impairment under hyperbaric environments is caused by the magnitude ofthe environmental pressure, rather than psychological stress.

Key words : deep saturation diving, hyperbaric exposure, Stroop interference, isolation, confine-ment

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��������� ����� ���������������� !"#$%&'(�)� *�������������+,�� !")-.��� /(��01� �������23456�7 ���� 892 :;�<�� /=8�� >?��@A�BC)DEFG��

� � � �

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