How can I tell how I think till I see what I say?

Descriptive Experience Sampling is a clever method for determining the form of everyday thoughts. Results using this method show that people report that some of their thoughts are unsymbolic. Here I ask three questions: (1) Does this merely show that people know what they are thinking about but not what they are thinking? (2) Why do people have difficulty determining the form of their thoughts? (3) How does the act of reporting the form of thoughts affect the recall of those thoughts?