The fact is the sense of smell is just as good in humans as in other mammals like rodents and dogs humans can discriminate maybe one trillion different odors he says which is far more than. One of the oldest beliefs about human perception is that we have a poor sense of smell not only is this a general belief among the public but it appears to have a scientific basis recent genetic studies show a decline in the number of functional olfactory receptor genes through primate evolution to humans. The human sense of smell although the human sense of smell is feeble compared to that of many animals it is still very acute we can recognise thousands of different smells and we are able to detect odours even in infinitesimal quantities. The olfactory system is responsible for our sense of smell this sense also known as olfaction is one of our five main senses and involves the detection and identification of molecules in the air once detected by sensory organs nerve signals are sent to the brain where the signals are processed
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