Unspecified Nouns and Verbs

"People can learn easily under hypnosis." There are a few things in this sentence which are not clear,

Which people?
How can they learn easily?
What do they learn easily?

When phrases like these are used, the listener is forced to use his or her imagination to fill in the who's and how's. Again, these types of phrases are useful for pacing and leading when the speaker becoming too specific could mismatch the listener and break rapport or minimize influence.

"So take a moment and enjoy remembering some of the things you learned and did at the seminar." What were your thoughts after hearing that sentence? Did you have a specific representation? What did you learn and do, and which seminar did you learn them at? Nominalizations are one type of unspecified noun.