Which is following best describes the type of attention where individuals must tune out irrelevant information?

Riddick constantly speaks in a manner that is hard to follow

because he quickly skips from topic to topic, sometimes even within a single sentence. This is most clearly the schizophrenic symptom of _____. Fill in the blank with correct word

Which aspect is least likely to be part of a definition of consciousness?

a. ?an awareness of internal mental activity b. ?the function and structure of cognition c. ?mental processes of which people are unaware d. ?an awareness of external stimuli