Cognitive scientist: Using the pioneering work of comparative psychologist Gordon Gallup as a model, several studies have investigated animals' capacity for mirror self-recognition (MSR). Most animals exposed to a mirror respond only with social behavior, such as aggression. However, in the case of the great apes, repeated exposure to mirrors leads to self-directed behaviors, such as exploring the inside of the mouth, suggesting that these animals recognize the reflection as an image of self. The implication of these studies is that the great apes have a capacity for self-awareness unique among nonhuman species.
The cognitive scientist makes which of the following assumptions in the argument above?The argument says that great apes show mirror self-recognition, while most other animals respond to mirrors only socially, and then concludes that great apes have a uniquely nonhuman capacity for self-awareness.
The key assumption is that
animals that lack mirror self-recognition also lack self-awareness. Without that link, the fact that other animals do not show MSR would not prove that they are not self-aware in some other way.
A. Gallup's work has established that the great apes have a capacity for MSR unique among nonhuman species.
This is not required. The argument uses Gallup’s work as a model, but it does not depend on Gallup himself having already established that conclusion.
B. If an animal does not have the capacity for MSR, it does not have the capacity for self-awareness.
This is the correct answer. The conclusion says great apes are unique among nonhuman species in self-awareness. That only follows if animals that do not show MSR are not self-aware. Otherwise, some other species could be self-aware even without recognizing themselves in mirrors.
C. If a researcher exposes an animal to a mirror and that animal exhibits social behavior, that animal is incapable of being self-aware.
This is too strong and not necessary. An animal could show social behavior in response to a mirror without that proving it is incapable of self-awareness in every case.
D. When exposed to a mirror, all animals display either social behavior or self-directed behavior.
This is not needed. The argument does not require those to be the only two possible responses.
E. Animals that do not exhibit MSR may demonstrate a capacity for self-awareness in other ways.
This weakens the argument rather than supports it. If this were true, then great apes would not necessarily be unique in self-awareness.
Answer: (B)