Who developed the concept of mental age and published the first successful test of intelligence?

Which of the following is a well-established difference between major depression and bipolar disorder?

a. Depression is more common than bipolar disorder in the general population. b. Depression is more common in men, whereas bipolar disorder is more common in women. c. Depression has a stronger genetic basis than bipolar disorder. d. Depression is acute, whereas bipolar disorder is chronic.

The "voluntary" motor abilities of a healthy newborn human include

a. reaching toward interesting objects b. all of the other alternatives are correct c. directing gaze, head turning, sucking and other mouth and tongue movements d. kicking away obstructions