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15 Cards in this Set

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  • Back


gradual reduction of strength of a response due to repetitive stimulation. Loss of interest

Holds head erect and steady

6 weeks

rolls from side to back

2 months

grasps cube

3 months, 3 weeks


7 months


7 months

pulls to stand

8 months

stands alone

11 months

walks alone

12 months

walks up stairs with help

16 months

jumps in place

23 months

dynamic systems theory of motor development

mastery of motor skills involves acquiring increasingly complex systems of action.

ulnar grasp

3-4 months. fingers close against palm

9 months

pincer grasp

differentiation theory

James Gibson. Infants actively search for stable features in their environment.