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非常学术的. 不但是英文的, 而且是2005年出版的, 并且还有文献索引. 你一定喜欢.
From: MONTESSORI, The science behind the genius
2005, Oxford
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The Impact of Crawling
The onset of crawling has also been linked to a broad array of advances in both the physical and the social domains. These advances include perception of distance, perception of one's own body motion, representation of spatial layout, ability to refer to objects by pointing, and other social and emotional developments (Campos et al., 2000).
One example of the developmental advances that come with self-locomotion in humans is seen in a study of infants' ability to find hidden objects. Infants, some of whom were already moving themselves (crawling or cruising along on two legs while holding something) and others of whom were not yet moving on their own watched from a distance as an experimenter hid a toy under one of two colored Cups. Infants were then carried to the hiding place. Even though all infants were of the same age (7 to 11 months), those infants who had been moving on their own the longest were significantly more likely to find the hidden object than were infants with less or no locomotor experience (Bai & Bertenthal,1992). This suggests that the onset of self-locomotion is related to developmental advances in the representation of self and space.
Self-generated locomotion also is linked to depth perception in human babies, echoing the Held and Hein finding with kittens described earlier. Wariness of heights develops when infants begin to move on their own (Campos et al., 200o). Infants who are not yet crawling are less likely to show a fear response - an increased heart rate - when lowered in a harness over a "visual cliff," a set-up that looks like a steep drop-off, than are infants of the same age who already crawl. This holds true even if a child's experience with self-generated movement is induced artificially, by having them use a walker.'
As with grasping, developments accruing with the onset of self-locomotion extend to the social realm as well. Asocial advance that appears to be related to self-locomotion is following a person's gaze. Following someone's gaze indicates at least rudimentary sensitivity to others' mental lives and thus is an important milestone in social cognition. Some studies of self-locomotion and gaze following occurred in China (Tao & Dong,1997, described in Campos et al., 2000). At least at the time of this study, urban Chinese infants spent much of their awake time propped in a sitting position on a very soft bed, surrounded by thick pillows to prevent falling. Their parents discouraged crawling to prevent dirty hands, and the infants crawled late relative to suburban Chinese infants who were more often permitted to crawl. When tested in a gaze-following procedure, suburban Chinese infants followed about 75% of gazes, whereas urban ones followed only about 50%. Other studies in both the United States and China have shown that even among crawlers, a child's tendency to follow a gaze is significantly related to the length of time the child has been crawling (Campos rl al., 2ooo). Self-produced locomotion thus appears to open the door to sharing others' mental experiences. |
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