Irritable vocalizations, sad facial expressions, and even hiccups, in an infant between 4 and 6 months of age, signify

The____________ hypothesis is a theory that attempts to explain how drugs and/or alcohol can be used in an attempt to alleviate symptoms of schizophrenia

A) dopamine B) serotonin C) substance abuse D) self-medication

Which of the following is true regarding newborn infants' vision?

A. Infants do not have color vision until around six months of age. B. Much of what young infants see is blurry. C. Pattern complexity has no impact on infants' visual preferences. D. Initial visual accommodation skills allow infants to focus clearly on far objects but not near objects.