Step 1: Understand the concept.
- Confirmation bias is the tendency to interpret new evidence as confirmation of one's existing beliefs or theories. - When observing others, people often notice behaviors that fit their expectations and ignore behaviors that don't.
Step 2: Check other options.
- Schema: Cognitive framework or concept. (Not observation-focused)
- Social judgment: Evaluating others but not necessarily biasing observation.
- Anchoring: Relying heavily on the first piece of information. (Different concept)
Thus, the correct tendency is: \[ \boxed{{Confirmation bias}} \]