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Effects of Occlusal Disharmony on Working Memory Performance and Prefrontal Cortex Activity Induced by Working Memory Tasks Measured by NIRS

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Oxygen Transport to Tissue XXXIV

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 765))

Abstract

The effects of artificial occlusal disharmony (AOD) on working memory function and prefrontal cortex (PFC) activity in the elderly were examined. We evaluated working memory function using the modified Sternberg test (ST). We measured activity in the bilateral PFC during ST using near-infrared spectroscopy (NIRS) before and after AOD: the mandibular position was displaced by a splint for 10 min. AOD caused a gradual increase of oxyhemoglobin (oxy-Hb) in the bilateral PFC. The response time of ST (six digits) after AOD was longer than that before AOD. The oxy-Hb increase during ST after AOD was smaller than that before AOD. These results indicate that short-term physical stress caused by AOD decreased working memory function in elderly subjects, associated with a decrease of the evoked PFC activity during working memory function.

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Acknowledgments

This research was partly supported by Japan Science and Technology Agency, under the Strategic Promotion of Innovative Research and Development Program, and a Grant-in-Aid from the Ministry of Education, Culture, Sports, Sciences and Technology of Japan (B23300247).

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Authors and Affiliations

  1. Division of Optical Brain Engineering, Nihon University School of Medicine, 30-1 Oyaguchi-uemachi, Itabasi-ku, Tokyo, 173-0032, Japan

    Kaoru Sakatani & Takeo Tsujii

  2. Division of Neurosurgery, Department of Neurological Surgery, Nihon University School of Medicine, Tokyo, Japan

    Teruyasu Hirayama & Youichi Katayama

  3. Department of Sports Dentistry, Tokyo Dental College, Chiba, Japan

    Tomotaka Takeda, Ai Amemiya & Keiichi Ishigami

Authors
  1. Kaoru Sakatani
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  2. Takeo Tsujii
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  3. Teruyasu Hirayama
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  4. Youichi Katayama
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  5. Tomotaka Takeda
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  6. Ai Amemiya
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  7. Keiichi Ishigami
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Corresponding author

Correspondence to Kaoru Sakatani .

Editor information

Editors and Affiliations

  1. Division of Nephrology and Hypertension, Georgetown University, Washington, DC, USA

    William J. Welch

  2. Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden

    Fredrik Palm

  3. Synthesizer, Inc., Ellicott City, MD, USA

    Duane F. Bruley

  4. Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, UK

    David K. Harrison

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Sakatani, K. et al. (2013). Effects of Occlusal Disharmony on Working Memory Performance and Prefrontal Cortex Activity Induced by Working Memory Tasks Measured by NIRS. In: Welch, W.J., Palm, F., Bruley, D.F., Harrison, D.K. (eds) Oxygen Transport to Tissue XXXIV. Advances in Experimental Medicine and Biology, vol 765. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4989-8_33

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