"
Mirror tests" have been done on
chimpanzees,
elephants,
dolphins and
magpies. During the test, the experimenter looks for the animals to undergo four stages: • social response (behaving toward the reflection as they would toward another animal of their species) • physical mirror inspection • repetitive mirror testing behavior, and • the mark test, which involves the animals spontaneously touching a mark on their body that would have been difficult to see without the mirror The red-spot technique, created by
Gordon G. Gallup, studies self-awareness in primates. This technique places a red odorless spot on an anesthetized primate's forehead. The spot is placed on the forehead so it can only be seen through a mirror. Once the primate awakens, its independent movements toward the spot after it sees its reflection in a mirror are observed.
David DeGrazia identifies three types of self-awareness that animals may share with humans. Bodily self-awareness allows animals to understand that they are different from the rest of the environment. It explains why animals do not eat themselves. Bodily awareness also includes
proprioception and
sensation. Social self-awareness, seen in highly
social animals, allows animals to interact with each other. Introspective self-awareness is how animals might sense feelings, desires, and
beliefs.
Apes Chimpanzees and other apes—extensively studied species—are most similar to humans, with the most convincing findings and straightforward evidence of self-awareness in animals. During the red-spot technique, after looking in the mirror, chimpanzees used their fingers to touch the red dot on their forehead and after touching the red dot, they would smell their fingertips. "Animals that can recognize themselves in mirrors can conceive of themselves," says Gallup.
Dolphins Dolphins were put to a similar test and achieved the same results.
Diana Reiss, a psycho-biologist at the
New York Aquarium discovered that
bottlenose dolphins can recognize themselves in
mirrors.
Elephants In a 2006 study, one elephant out of three passed the mirror test.
Magpies Researchers also used the mark or mirror tests to study the
magpie's self-awareness. As a majority of birds are blind below the beak, Prior
et al. marked the birds' necks with three different colors: red, yellow, and black (as a control, as magpies are originally black). When placed in front of a mirror, the birds with red and yellow spots began scratching at their necks, signaling the understanding of something different being on their bodies. During one trial with a mirror and a mark, three of the five magpies showed at least one example of self-directed behavior. The magpies explored the mirror by moving toward it and looking behind it. One of the magpies, Harvey, during several trials would pick up objects, pose, and do some wing-flapping, all in front of the mirror with the objects in his beak. This represents a sense of self-awareness; knowing what is going on within himself and in the present. The authors suggest that self-recognition in birds and mammals may be a case of
convergent evolution, where similar evolutionary pressures result in similar behaviors or traits, although they arrive at them via different routes. A few slight occurrences of behavior towards the magpie's own body happened in the trial with the black mark and the mirror. The authors of this study suggest that the
black mark may have been slightly visible on the black feathers. "This is an indirect support for the interpretation that the behavior towards the mark region was elicited by seeing one's own body in the mirror in conjunction with an unusual spot on the body." There was a clear contrast between the behaviors of the magpies when a mirror was present versus absent. In the no-mirror trials, a non-reflective grey plate was swapped in the same size and position as the mirror. There were no mark-directed self-behaviors when the mark was present, in color or in black. The results show that magpies understand that a mirror image represents their own body; magpies have self-awareness. == Other uses ==