Video Summary
The mirror test measures visual self-recognition but misses species that rely on other senses.
Scent-based experiments show dogs may recognize changes in their own smell, suggesting self-knowledge in their sensory terms.
Metacognition studies (monkeys, rats, dolphins) reveal animals can assess their own knowledge and uncertainty.
Qualia — the private feel of experience — remains inaccessible to outsiders and poses a philosophical limit.
The Cambridge Declaration argues many animals share neural substrates for conscious states; behaviors like prolonged grieving support emotional depth.
The mirror test places a mark on a body area only visible via a mirror; animals that touch the mark are taken to recognize themselves. Chimpanzees, bonobos, some orangutans and gorillas (occasionally), dolphins, orcas, elephants, and the Eurasian magpie have all shown passing behaviors.
Because it relies on vision and mirrors; species that depend on other senses (like dogs and smell) may fail the test despite having self-knowledge. Modified tests, such as scent-based experiments, reveal self-recognition in ways appropriate to an animal's sensory world.
Experiments found rhesus monkeys choose easier tests when uncertain, rats opt out of unfamiliar tests for safer rewards, pigeons can report memory failures, and dolphins hesitate when uncertain—indicating animals can monitor and evaluate their own knowledge states.
Qualia are the subjective, first-person qualities of experience (what it feels like). Even with behavioral and neural evidence, qualia remain inaccessible to outside observers, so we can't directly know what an animal's inner experience feels like.
The Cambridge Declaration and diverse behavioral evidence suggest the neural substrates and capacities for conscious states exist beyond humans, and dramatic behaviors like prolonged grief in orcas support the idea of emotional depth and a spectrum of consciousness.
"In 1970, psychologist Gordon Gallup Jr. developed the mirror test, considered the gold standard for assessing self-awareness in animals."
The mirror test evaluates self-recognition by placing a mark on an animal’s body where it can only see it in a mirror.
Most animals react to their reflection as if it's another creature; they may bark or try to scare it away without recognizing themselves.
However, a select few animals, such as chimpanzees, dolphins, and the Eurasian magpie, do recognize themselves by touching the mark on their bodies.
"Many scientists argue that the mirror test is not an adequate measure of self-awareness."
Critics suggest that the mirror test may not be suitable for all species, particularly for those like dogs that rely more on their sense of smell than sight.
A modified version of the test was created by researcher Alexandra Horowitz, who introduced scent-based methods to see if dogs could recognize themselves through altered or foreign urine.
Findings revealed that dogs spent more time exploring altered versions of their scent, indicating that they may have a form of self-awareness within their own sensory framework.
"Metacognition is the ability to think about your own thinking."
Researchers observed that animals, such as rhesus monkeys and rats, can evaluate their own knowledge and uncertainty, demonstrating metacognitive abilities.
Monkeys preferred easier questions when unsure of the answers, while rats opted out of tests they hadn't prepared for, indicating they are aware of their knowledge limits.
Dolphins show similar behaviors of uncertainty before responding, emphasizing that many animals have a degree of self-awareness about their internal states.
"Qualia refers to the subjective experience of being and perceiving."
The discussion around consciousness leads to the philosophical concept of qualia, which ponders what it feels like to be a specific creature, such as a dog or a bat.
Philosopher Thomas Nagel emphasized that while we can study animal behavior, the inner experience or feeling of being is likely inaccessible to us.
This raises questions about the real experience of animals and whether they have a consciousness comparable to humans.
"The neurological structures that produce consciousness in humans are not unique to us."
The Cambridge Declaration on Consciousness asserts that various animals possess the neural substrates for conscious states, suggesting consciousness exists on a spectrum.
Frans de Waal points out that rather than being entirely unique to humans, consciousness has likely evolved gradually and is present among many species.
"In 2018, a killer whale named Tahlequah carried her dead calf for 17 days, exhibiting a profound emotional response."
This behavior, known as a 'tour of grief,’ highlights the ability of some animals to experience grief in ways comparable to humans.
There are no obvious evolutionary advantages to carrying a deceased companion for an extended period, suggesting a deeper understanding of loss and existence.
Such behavior supports the idea that at least some animals possess a form of self-awareness regarding their own experiences and emotions.
