Because the brain attains 80% of its adult size in the first few postnatal years, it is particularly susceptible to extrinsic factors such as poor nutrition or a physical blow during this time.

Extrinsic (external) factors are those influences that have only a negative effect on growth and development.

The contemporary view is that the perceptual, cognitive, and action developmental systems are independent of one another.

Which of the following is characteristic of proficient catching? Select all that apply.

Recent research has shown that children can be at the most advanced levels of upper arm and forearm action before they routinely use trunk rotation.

Which of the following is characteristic of proficient punting?

The ossification of the skeleton begins postnatally.

Sex differences among children and adolescents have been documented in which body components for overarm throwing? Select all that apply.

Research demonstrates that older adults can maintain their coincidence-anticipation performance, and even improve it, with practice.

Sex differences among older adults in overarm throwing have been associated with which of the following?