In 200-250 words, state what your favorite sub-discipline of Psychology is and why you chose that one? Did you learn something new about that sub-discipline? If so, what? Be sure to included at least one source in addition to the textbook.  Students should adhere to APA guidelines for citing and referencing. Initial Posts and Responses to classmates are expected to include thorough research and constructive feedback pertaining to the topic. *** The topic i chose is developmental psychology because I have a six year old.