At the time of Huxley and Darwin, your question would mostly get the response that the presumption is wrong. These days we know that the foundational biochemist

At the time of Huxley and Darwin, your question would mostly get the response that the presumption is wrong. These days we know that the foundational biochemistry out of which these qualia arise is the same give or take a few pathways and therefore tend to doubt that humans are especial in these characteristics.