What are the two major components of the nervous system?

Whenever Angus tries to reach his girlfriend Jean on the phone, he must dial several times because she is quite the talker and her line is often busy. When Angus finally gets through to Jean, he will be reinforced on which schedule?

a) fixed ratio b) variable ratio c) fixed interval d) variable interval

Infant-directed speech and parent–child conversation

A) create a zone of proximal development in which children's language expands. B) contribute to a decline in infantile amnesia. C) have little impact on language development because language emerges spontaneously. D) foster referential communication skills.