Human nose can detect one trillion smells

The human nose can detect more than one trillion individual smells, billions more than the commonly held figure of just 10,000.

Neus1A study, published in the journal Science by US scientists, suggests that the human nose is far more capable than originally thought and able to detect billions more smells than the now seemingly meagre 10,000 smells previously assumed by scientists, as reported by The Guardian.

A team of scientists used a collection of 128 different chemicals to create different odours with varying degrees of similarity and tested if subjects could spot the difference, with each odour containing either 10, 20 or 30 different components.

Participants were then asked to pick the odd one out among three vials containing odours with the same number of components but different degrees of similarity.

While performance varied greatly between the 26 participants, scientists found that while no one could tell odours with more than 90% similarity, at least half of the participants could tell odours apart when the degree of overlap was less than 75%.

Dr Andreas Keller of Rockefeller University, lead researcher of the project, said: “Our study replaces that previous number of 10,000 with a much more realistic and [much] higher number and shows the human sense of smell does have a good capacity to discriminate.”

From the results, Keller and his team worked out the number of possibly detected smells by taking the total number of possible odour mixtures possible concluding that the human nose is realistically capable of discriminating between one trillion different odours made up of 30 components.

Despite their figure dwarfing previous estimates, Keller still believes the result is an underestimation of the abilities of the human nose, pointing toward the fact that there are far more odorous molecules than the 128 studied.

Leave a Reply

Your email address will not be published. Required fields are marked *

Please note that comments are subject to our posting guidelines in accordance with the Defamation Act 2013. Posts containing swear words, discrimination, offensive language and libellous or defamatory comments will not be approved.

We encourage debate in the comments section and always welcome feedback, but if you spot something you don't think is right, we ask that you leave an accurate email address so we can get back to you if we need to.

Subscribe to our newsletters

The Global Riesling Masters 2018

View Results

Global Chardonnay Masters 2018

View Results

Click to view more