Saying uhhuh, or oh, or I see seems like a little thing but why is doing this kind of thing an ...

Saying uhhuh, or oh, or I see seems like a little thing but why is doing this kind
  of thing an important part of practicing skillfully?
 
  a. These short vocalizations serve as non-intrusive indications of your active
  listening and focused thinking about what clients are saying to you
  b. It makes the other person feel as thought you are not listening to what they
  have to say and are instead wondering about something outside of the
  session
  c. This makes the client think you are faking your interest in them
  d. Saying these kinds of things can allow clients to develop an understanding of
  how they typically behave in interactions with you and others