Home   Publication   A new method of walking rehabilitation using cognitive tasks in an adult chimpanzee (Pan troglodytes) with a disability: a case study.
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Sakuraba Y, Tomonaga M, Hayashi M (2016) A new method of walking rehabilitation using cognitive tasks in an adult chimpanzee (Pan troglodytes) with a disability: a case study. Primates Volume 57, Issue 3, pp 403-412

Yoko Sakuraba , Masaki Tomonaga, Misato Hayashi

A new method of walking rehabilitation using cognitive tasks in an adult chimpanzee (Pan troglodytes) with a disability: a case study.

Primates. doi: 10.1007/s10329-016-0541-3




日本語要旨

後天的身体障害をもつ動物における長期的なケアやリハビリテーション(以下リハビリ)は,福祉の観点から重要にも関わらず研究は少ない.京都大学霊長類研究所には,急性横断性脊髄炎を発症したレオというオトナオスのチンパンジーが飼育されている.彼は寝たきりなったが,その後筋力と上肢の機能が回復し,動き回ることができるようになったが,両後肢にはまだ障害が残っている.本研究ではレオに認知課題を利用した歩行リハビリの導入を試みた.認知課題が提示されるタッチモニターと報酬が提示されるフィーダーを約2m離して設置した.当初タッチモニターを怖がる様子が観察されたが,馴致や装置の調整によってモニターとフィーダーの間を歩行するようになった.さらに1日のリハビリ時間を制限し,自動的にモニターに課題が提示されるようにすると,その場にスタッフがいない場合でもレオは自発的にリハビリを始めるようになった.リハビリがない日とある日の午後2時間について分析すると,移動距離が136.7mから506.3mに長くなり,歩行の割合が1.2%から27.2%に増加していた.本研究は事例研究ではあるが,認知課題が身体障害をもつチンパンジーにおいて,リハビリと福祉を向上させることに役立つことを示せただろう.



Abstract

There are few studies of long-term care and rehabilitation of animals which acquired physical disabilities in captivity, despite their importance for welfare. An adult male chimpanzee named Reo at the Primate Research Institute of Kyoto University, developed acute myelitis, inflammation of the spinal cord, which resulted in impaired leg function. This report describes a walking rehabilitation system set up in a rehabilitation room where he lives. The rehabilitation apparatus consisted of a touch monitor presenting cognitive tasks and a feeder presenting food rewards at a distance of two meters from the monitor, to encourage him to walk between the monitor and the feeder repeatedly. Initially, Reo did not touch the monitor, therefore we needed adjustment of the apparatus and procedure. After the habituation to the monitor and cognitive tasks, he started to show behaviors of saving food rewards without walking, or stopping participation to the rehabilitation. Finally it took seven phases of the adjustment to determine the final setting; when the monitor automatically displayed trials in 4-h, AM (1000?1200 hours) and PM (1400?1600 hours) sessions through a day, Reo spontaneously walked from the monitor to the feeder to receive rewards, and returned to the monitor to perform the next trial. Comparison of Reo’s locomotion in a no-task period and under the final setting revealed that the total travel distance increased from 136.7 to 506.3 m, movement patterns became multiple, and the percentage of walking increased from 1.2 to 27.2 % in PM session. The findings of this case study suggest that cognitive tasks may be a useful way to rehabilitate physically disabled chimpanzees, and thus improve their welfare in captivity.



Keywords

Chimpanzee, Physical disability, Walking rehabilitation, Animal welfare, Cognitive task



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