Why do you think a child cries when feeling hungry?Or why do you think a child learns to become aggressive?
 What is the role of reward and punishment in learning?? What are the types and
schedule of reinforcement?

Awaiver of the requirement for documentation of informed consent may be granted when: the investigator has no convenient place to store signed consent forms separate from the research datathe only record linking the subject and the research is the consent document and the principal risk is a breach of confidentiality.potential subjects might find some of the research questions embarrassing, personal, or intrusivethe subjects are literate in their own language; however, they do not read, write, or speak english