Betsy notices that her infant gained control of the muscles in his upper arms and then his lower arms,wrist,hands,and and,finally his fingers.This pattern she observed is referred to as the

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The pattern Betsy observed is the proximodistal pattern, which refers to the pattern of motor development from the center of the body outwards. In other words, control of muscles in the upper arms develops before control of muscles in the hands and fingers. The cephalocaudal pattern refers to the pattern of development from the head downwards, which is not what Betsy observed. The zone of proximal development refers to the difference between what a child can do with assistance and what they cannot do alone, and is not relevant to the pattern Betsy observed. The one-step-ahead pattern is not a common concept in developmental psychology.

Betsy Notices That Her Infant Gained Control of the Muscles