Sentence Analysis
The sentence uses a colon (:) to provide a definition or explanation of the blank.
- The Clue: The explanation states that animals are being tested in ways that "work fine with humans but not so well with other species."
- The Logic: The problem is that scientists are centering the experiments around a human perspective or human-standardized methods.
- The Match: Anthropocentric comes from the Greek roots anthropos (human) and kentron (center). It describes the tendency to regard humankind as the central or most important element of existence, or, in this context, to interpret the world (and animal behavior) exclusively through human values and experiences.

Why the other options do not fit:
- Self-contradictory: There is no evidence that the scientists' methods conflict with their own statements; the conflict is between their methods and the animals' needs.
- Dogmatic: This means laying down principles as incontrovertibly true. While scientists can be dogmatic, the specific error described here is centered on human bias, not general stubbornness.
- Haphazard: This means lacking any obvious principle of organization (random). The experiments aren't described as random; they are described as specifically tailored to humans.
- Novel: This means new or unusual. Using human-centric tests isn't necessarily a "new" approach; in fact, the sentence suggests it's a common mistake that "handicaps" research.