Which barriers to self perception (reliance on rigid schemata, socializing forces, self-fulfilling prophecies, lack of supportive interpersonal relationships, distorted patterns
of thinking and acting) do you think present the most challenges to you and why? What
can you do to start to overcome these barriers?

the answer to the question is punishment. or more specifically, positive punishment.

positive punishment occurs when a behavior is given a negative consequence for the individual doing the behavior.

sara no longer wants to ask questions (the behavior) because she is ridiculed by mr. smith (the punishment).

reinforcement is inaccurate because reinforcement always gives positive consequences for the individual doing the behavior, be it by introducing a pleasant consequence or removing an unpleasant one.