Goldfield E C, Michel G F
Dev Psychobiol. 1986 May;19(3):259-64. doi: 10.1002/dev.420190311.
Timing and direction of movement of the arms and hands of 7- and 11-month-old infants were examined during bimanual reaching for a transparent cube. Videotape analysis of frames from release of the hands to initial contact of one hand with the cube revealed that hand movement was more often temporally linked for 7-month infants than for 11-month infants. Also, at 7 months, the hands moved toward the cube in the same direction, whereas at 11 months, they moved in opposite (complementary) directions. Thus, although both 7- and 11-month infants perform bimanual reaching, at 7 months the 2 hands are linked both in timing and direction of movement in a fashion different than at 11 months.
在7个月和11个月大的婴儿双手够取一个透明立方体的过程中，对他们手臂和手部的运动时间及方向进行了检查。从双手松开到一只手首次接触立方体的视频帧分析显示，与11个月大的婴儿相比，7个月大的婴儿手部运动在时间上的关联性更强。此外，7个月大时，双手朝着立方体的同一方向移动，而11个月大时，双手朝着相反（互补）的方向移动。因此，尽管7个月和11个月大的婴儿都会进行双手够取动作，但7个月大时，两只手在运动时间和方向上的关联方式与11个月大时不同。
