Rudolf’s teacher praises him whenever Rudolf says “Skinner”…

Rudolf’s teacher praises him whenever Rudolf says “Skinner” while looking at a picture of B. F. Skinner. If Rudolf says “Skinner” while looking at a picture of Chomsky, Watson, Bandura, or Pavlov, his teacher does not praise him. Eventually, Rudolf learns to say “Skinner” only in the presence of a picture of B. F. Skinner. This illustrates:

Terry repetitively waves his long fingers back and forth in…

Terry repetitively waves his long fingers back and forth in front of his face at very high rates during meal time, during leisure time, when asked to do something, and even when there is plenty of attention.  Most likely he does this because he likes the way it feels.  This is an example of: