What percent of U.S. infants are classified as securely attached using the Strange Situation procedure?

Piaget argued that movement from one stage to the next occurs when an individual reaches an appropriate level of physical maturation and is exposed to relevant experiences

Indicate whether the statement is true or false.

Individuals with ADHD have been found to have deficits in their ___

a. prefrontal cortex and the cerebellum b. basal ganglia and cerebellum c. prefrontal cortex and basal ganglia d. None of the above