Sleep Medicine and Psychophysiology (수면정신생리)

KOREAN ACADEMY OF SLEEP MEDICINE (대한수면의학회)
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The Changes of Short-Term Memory and Autonomic Neurocardiac Function after 4-10Hz Sound and Light Stimulation - A Pilot Study -

4-10 Hz 빛과 소리자극 후 단기기억력 및 자율신경심장기능의 변화 - 예비연구 -

  • Lee, Seung-Hwan (Department of Psychiatry, College of Medicine, Inje University, Ilsanpaik Hospital) ;
  • Kim, Jin-Hwan (Department of Psychiatry, College of Medicine, Inje University, Ilsanpaik Hospital) ;
  • Park, Joong-Kyu (Department of Psychiatry, College of Medicine, Inje University, Ilsanpaik Hospital) ;
  • Lee, Kyung-Uk (Department of Psychiatry, College of Medicine, The Catholic University of Korea) ;
  • Yang, Dae-Hyun (Department of Psychiatry, College of Medicine, The Catholic University of Korea) ;
  • Hong, Keun-Young (Department of Psychiatry, College of Medicine, The Catholic University of Korea) ;
  • Chae, Jeong-Ho (Department of Psychiatry, College of Medicine, The Catholic University of Korea)
  • 이승환 (인제대학교 의과대학 정신과학교실) ;
  • 김진환 (인제대학교 의과대학 정신과학교실) ;
  • 박중규 (인제대학교 의과대학 정신과학교실) ;
  • 이경욱 (가톨릭대학교 의과대학 정신과학교실) ;
  • 양대현 (가톨릭대학교 의과대학 정신과학교실) ;
  • 홍근영 (가톨릭대학교 의과대학 정신과학교실) ;
  • 채정호 (가톨릭대학교 의과대학 정신과학교실)
  • Published : 2004.06.30
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Abstract

Objectives: Sound and light (SL) stimulation has been used as a method to induce some useful mental states in the fields of psychology and psychiatry. It is believed that sound and light entrainment device (SLED) has some specific effects through synchronization of EEG in patients who use it. Theta frequency is believed to stimulate deep relaxation and short term memory processing. This study was conducted to evaluate if 4-10 Hz SL stimulation can induce relaxation and improve short term memory function. Methods: Ten medical students with no medical or psychiatric problems participated in this study. Subjects were randomly divided into two groups. One group was applied with real SLED was applied to one group (R group) and pseudo SLED to the other group (P group). The two groups were exposed to SL stimulation with SLED 15 minutes a day for 5 days, and after two days rest the two groups were switched over. The Korean Wechsler Adult Intelligence Scale (K-WAIS), Academic Motivation Tests (AMT), Test Anxiety Scale (TAS), Korean Auditory Verbal Learning Test (K-AVLT), and digit span were used to evaluate short term memory. Spielberger's State-Trait anxiety inventory and heart rate variability (HRV) test were used to evaluate degree of relaxation. Results: Compared with S group, R group showed a significant improvement in K-AVLT and digit span after a single application of SL stimulation. But 5-day long application did not reveal any differences between the two groups. A significant change in HRV was observed in 5-day long application of SL stimulation after being switched over to other SLED. Conclusion: This pilot study suggests that 4-10 Hz SL stimulation has some positive influences on short term memory and relaxation.

목 적 : 본 연구는 $4{\sim}10\;Hz$의 빛과 소리자극이 인체의 단기기억력 및 긴장이완에 어떠한 영향을 주는지 관찰하기 위한 예비연구로 시행되었다. 방법：총 10명의 대상을 무작위로 동기화된 파형의 빛과 소리를 가한 처치군(R 군)과 동기화되지 않은 무작위 파형의 빛과 소리를 가한 허위군(P 군)으로 분류하고, 하루 15분씩 5일간 빛과 소리 자극을 가하였다. 단기기억력을 측정하기위한 척도, 불안 척도 그리고 자율신경심장 기능 검사 등을 시행하였다. 2일간 휴식 후 R군과 P군을 교차하여 5일간 같은 실험을 반복하였다. 결 과：R군에서 빛과 소리자극 1회 적용 후 단기기억력의 유의미한 향상이 관찰되었다. 자율신경심장기능 검사에서는 R군에서 유의미한 이완 효과가 관찰되었다. 결 론：이 연구 $4{\sim}10\;Hz$의 빛과 소리자극이 단기기억 및 긴장이완과 연관됨을 암시한다. 향후 실험대상수를 늘려 예비연구결과를 확인함이 필요하다.

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