Marco, a 15-year-old, is playing soccer. Despite having great strength and conditioning, he often seems to trip over his own feet, and he is struggling to master complex ball-handling maneuvers that require constant, rapid adjustments to his body position. His coach suggests this might be due to a temporary developmental challenge. As discussed in your textbook, this period of “transient motor awkwardness” in adolescence is thought to be related to the incomplete maturation of which sensorimotor skills?

By the age of two, most toddlers can use two-word sentences and __________ speech where non-critical words of a sentence are left out.

Luke is playing with a bouncing ball in his playpen, and accidentally the ball bounces out of the playpen and rolls under a nearby chair. Luke tries to get his mother to retrieve his ball by pointing in the direction of where the ball went under the chair. Piaget would say that Luke is showing 

George, 88, participates in a university study and scores as well on tests of episodic memory and attention as the average 55-year-old. This impressive cognitive performance, which defies typical age-related decline, places George in the category of:

Some adolescents engage in risky behaviors, because they believe they are invulnerable to the negative consequences of these actions. This is an example of:

7-year-old Aisha is working with clay in art class, and she rolls a round ball of clay between her hands until it becomes a long rope of clay. However, she decides that she doesn’t want the rope of clay, but would prefer that the clay is in the shape of a ball again. Aisha knows that this is possible. Piaget would say that Aisha is demonstrating the knowledge of

What is the major difference between primary circular reactions and secondary circular reactions in Piaget’s sensorimotor stage?

Nathan and Sara are eating granola bars. Sara breaks her bar in half. Nathan gets upset because Sara now has two granola bars. Nathan has not developed the concept of:

When a 1-month-old Gabriela is held up to her caregiver’s face, she seems to focus intently on the caregiver’s hairline and the shape of their jaw, but she doesn’t seem to make consistent eye contact. However, when she is 2 months old, she starts to visually track the caregiver’s eyes and mouth, often gazing specifically at the eyes. This rapid change in visual scanning ability is possible because the visual system is:

Find the intercepts and then graph the line.2x + y = -6