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  • From: "alex stevenson" <alexs19 AT hotmail.com>
  • To: monkeywire AT franklin.oit.unc.edu
  • Subject: Walking upright stimulates brain of monkey
  • Date: Wed, 09 Jan 2002 10:02:30


This article was in a paper here in Japan that I thought it might fit the Monkeywire criteria.



The Daily Yomiuri
Tuesday, December 18, 2001
Jun Sugimori, Yomiuri Shimbun Staff Writer

Walking upright stimulates brain of monkey

Monkeys walking on two feet have long been an integral part of circus acts. The way they waddle from side to side appeals to our sense of comedy.
Now, however, Prof. Shigemi Mori and other researchers at the National Institute for Physiological Sciences have succeeded in training monkeys to walk erect smoothly, as humans do, by working with them from the age of 2 1/2 years.
Through this research, the scientists have learned that there is a considerable difference in brain function when an animal walks bipedally and when it walks on all fours.
The researchers expect their findings to provide clues as to the influence of bipedalism on the evolution of the human brain.
At the beginning of the project, Mori's group helped the monkeys stand up by having people support them with their hands.
Then the researchers tried to have the monkeys learn how to walk on a treadmill in their laboratory. They walked for 30 minutes to an hour every day.
About two months later, the monkeys had achieved a rudimentary ability to walk bipedally, although only very slowly at the beginning.
Seven months after the experiment began, the monkeys were able to walk at much higher speeds.
When they walk, they skillfully use the joints of their knees and the tips of their toes. The instability of their vertical axes that had caused their bodies to waver from left to right decreased significantly. Their posture came to resemble more that of young children, with straight spines, and they developed more muscles along the inner thigh, also helping to smooth out their gait.
After two years of training, the monkeys have developed S-shaped backbones, very similar to human ones. Their weight is fully supported by their two feet, showing that their bodies have adjusted to bipedalism.
As their bodies changed physically, the monkeys found ways to further enhance their ability to walk. They have learned how to change the length of their stride as well as how to adjust slightly their center of gravity in relation to the steepness of slopes.
The monkeys even avoid obstacles in their way by raising their feet higher. When they stumble against something, they are able to balance their weight with their hands, recovering their equilibrium. In the case of obstacles, the monkeys prepare for them by raising their legs higher than usual. This anticipatory movement is believed to require a high level of intelligence.
In the project, the researchers, in cooperation with instrument maker Hamamatsu Photonics K.K., examined what part of the brain the monkeys mainly used when they walked upright. As bipedalism increased, a certain area of the brain that handles relatively sophisticated processing saw more action.
More activities were recorded in the motor area that gives instructions for physical movement and in the visual area that handles visual information in the cerebral cortex when the monkeys walked upright rather than on all fours.
Researchers said this seems to show that bipedalism altered the way the monkeys used their brains.
"They have been reluctant to walk on all fours, and they look more lively when they walk on two legs," Mori said. "There might also have been an increase in intelligence."
It is believed that human beings developed intelligence after the cerebral cortex enlarged as bipedalism increased.
Mori said: "The brain controls movement of the hands and legs. But physical movement also has an effect on the brain, enhancing development. By chronologically examining changes in the function of the brain as the ability to walk bipedally develops, we'll be able to understand how humans developed intelligence upon receiving various stimuli during evolution."
The research on bipedalism in monkeys is believed to be helpful in the study of the development of babies' brains and the prevention of falls in the elderly.
It has been reported that about 5 percent of the elderly population have experienced falls and nearly half of these falls have resulted in bone fractures, some of which leave the patient bedridden.
To avoid fall, the ability to anticipate obstacles and balance one's weight are necessary.
A decline in these abilities, in conjunction with failing eyesight and lack of exercise, are believed to be the main cause of falls.
"By thoroughly examining the difference in the function of the brains of monkeys who walk erect and monkeys who use all four limbs, I hope to fight the decline of the power of memory or recognition among the elderly, as well as work toward the prevention of falls," Mori said.

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  • Walking upright stimulates brain of monkey, alex stevenson, 01/09/2002

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