The comparative studies on brain structures based on different echolocation sound of bats

• Project/Area Number: 02044006
• Research Category: Grant-in-Aid for international Scientific Research
• Allocation Type: Single-year Grants
• Section: Joint Research
• Research Institution: Hokkaido University School of Dentistry
• Principal Investigator: KAMEDA Kazuo Hokkaido University School of Dentistry, Professor, 歯学部, 教授 (70018414)
• Co-Investigator(Kenkyū-buntansha): KAMADA Tsutomu Hokkaido University School of Dentistry, Instructor, 歯学部, 助手 (20091431) ; ASANUMA Atsushi Turumi University, School of Dentistry, Lecturer, 歯学部, 講師 (90089392) ; NODASAKA Yoshiaki Hokkaido University School of Dentistry, Teaching Assistant, 歯学部, 教務職員 (30184005) ; HORIKAWA Junsei Tokyo Medical and Dental University, Institute of Medicine, Associate Professor, 難治疾患研究所, 助教授 (50114781) ; MATSUMURA Sumiko Yamaguchi University, College of Medical Technology, Associate Professor, 助教授 (30136204) ; SHIMOZAWA Tateo Hokkaido University, Institute of Electronic Sciences, Professor, 電子科学研究所, 教授 (10091464) ; TANIGUCHI Ikuo Tokyo Medical and Dental University, Institute of Medicine, Professor, 難治疾患研究所, 教授 (60014255) ; 孫 心徳 中国華東師範大学, 生物系, 教授 ; O'NEILL WILL アメリカ合衆国ロチェスタ大学医学部, 教授 ; SCHEICH HENN ドイツ, マグデブルク神経生物学研究所, 教授 ; EHRET GUMTER ドイツ, ウルム大学・医学自然科学部, 教授 ; JEN PHILIP H アメリカ合衆国, ミズーリ州立大学・芸術科学部, 教授 ; SUGA Nobuo Washington University, Department of Biology, Professor, ワシントン大学・生物学部, 教授 ; XINDE Sun East China Normal University, Department of Biology, Professor ; WILLIAM E. O'Neill Rochester University, School of Medicine, Professor ; GUNTER Ehret University of Ulm, Faculty of Science and Medicine, Professor ; HENNING Scheich Institute of Neurobiology, Magdeburg, Professor ; PHILIP H. -S. Jen University of Missouri, College of Art and Sciences, Professor ; EHRET Gunter ウルム大学, 医学自然科学部(ドイツ), 教授 ; JEN Philip H ミズーリ州立大学, 芸術科学部(アメリカ合衆国), 教授 ; 根津 恵理子 北海道大学, 歯学部, 助手 (60111176) ; 土屋 公幸 宮崎医科大学, 動物実験施設, 助教授 (30155402) ; GUNTER Ehret ウルム大学, 医学自然科学部(ドイツ), 教授
• Project Period (FY): 1990 – 1992
• Project Status: Completed (Fiscal Year 1992)
• Budget Amount: ¥11,600,000 (Direct Cost: ¥11,600,000); Fiscal Year 1992: ¥3,500,000 (Direct Cost: ¥3,500,000); Fiscal Year 1991: ¥4,000,000 (Direct Cost: ¥4,000,000); Fiscal Year 1990: ¥4,100,000 (Direct Cost: ¥4,100,000)
• Keywords: Bat / Echolocation / Auditory cortex / Communication sound / Synchronization of firing / エコ-ロケ-ション / 音源方向特異性 / 刺激音最適頻度 / 橋聴性ニュ-ロン / コミュニケ-ションサウンド / 時間遅延回路 / 系統分類学的関係

Research Abstract

The aim of the project is to confirm that the functional structure of mastached bats also appears in the other species bats living in northern America, Europe or Japan. Such a fine cortical organization was found mainly in mastached bat from Central America by Nobuo Suga. The project invited Henning Scheich from Germany to get informations about the method of 2-DG and his findings in rodents as well as supported the communication with Suga continuously.
The project also sent two of the members to Suga's laboratory and performed neurophysiological experiments in mastached bats. The study elucidated that there were a few cases in auditory cortex in which the neurons located in different cortical areas fired synchronously. The synchronization is interesting because the brain seems to integrate the sensory information in cortex. The other member studied about FM bats and found that there are neurons which represent differential firing to stimuli whose frequency is different. A member studied the responsibility of pontine neurons to sounds coming from various direction in north American FM bats and found they are more sensitive to the sounds from center rather than from peripheral direction.
Two members went to Germany and studied anatomical structure of bats related to rodents using HRP methods. The study clarified the neuronal connections between medial geniculate body and auditory cortex.
The vocalization sounds of Japanese bats and auditory threshold curves of CF-FM bats were analyzed also. The sound structures were similar to other species of bats living in northern and central America or Europe, which indicated that the functional structures of bats seem to be common among all species of bats performing echolocation using ultrasounds.

Research Products

• [Publications] KAMADA, T. and P.H.-S. Jen: "Auditory response pronerties and spatial response areas of singleneurons in the pontine nuclei of the big brown bat, Eptesicus fuscus." Brain Res.575. 187-198 (1992)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] TANAKA, H., Wang,D. and TANIGUCHI, I.: "The influence of stimulus duration on the delay tuning of cortical neurons in the FM bat, Myotis lucifugus." J. comp. Physiol. 171. (1992)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] Kanwal, J. S., MATSUMURA, S. and N. Suga: "Properties of communication sounds of the mustached bat." ARO meeting abstract. (1992)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] 亀田 和夫,鎌田 勉: "コウモリの脳は特殊か?" 学術月報. (1993)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] Kamada, T. and P. H. -S. Jen: "Auditory response properties and spatial response areas of single neurons in the pontine nuclei of the big brown bat, Eptesicus fuscus." Brain Res.575. 187-198 (1992)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] Tanaka, H., Wang, D. and I. Taniguchi: "The influence of stimulus duration on the delay tuning of cortical neurons in the FM bat, Myotis lucifugus." J. comp. Physiol.171. (1992)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] Kanwal, J. S., Matsumura, S. and N. suga: "Properties of communication sounds of the mustached bat." ARO meeting abstract. (1992)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] Kameda, K. and T. Kamada: "Is the brain of bat special ?" Gakujutsu Geppou. (1993)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] Kamada,T.and P.H.-S.Jen: "Auditory response properties and spatial response areas of single neurons in the pontine nuclei of the big brown bat,Eptesicus fuscus." Brain Research. (1992)