Katiyar G P, Sen S, Agarwal K N
Acta Neurol Scand. 1976 May;53(5):390-4. doi: 10.1111/j.1600-0404.1976.tb04357.x.
Cross-sectional as well as longitudinal studies on full-term urban and rural infants demonstrated that the initial extensor plantar response present in the first half of the infancy changed to a flexor plantar response in the later half. The urban infants receiving nutritional supplements showed an advance of 4 weeks over the rural infants. This process of change-over of plantar response was delayed in pre-term infants. However, two pairs of twins showed plantar response almost identical to full-term urban infants.
对足月城乡婴儿进行的横断面研究和纵向研究表明，婴儿期前半段出现的初始跖伸反应在后期转变为跖屈反应。接受营养补充剂的城市婴儿比农村婴儿提前4周出现这种转变。早产儿跖反应的这种转变过程有所延迟。然而，有两对双胞胎的跖反应几乎与足月城市婴儿相同。
