Feeling stressed makes the world smell worse
New study suggests that stress can make normally pleasant aromas rather more unpleasant
Heather Saul is a digital reporter for The Independent, currently working on the People desk. She has written news and features across a number of topics, paying particular attention to the activities of Isis and events in Iraq, Syria, Iran and Saudi Arabia.
Friday 27 September 2013
Stress can make the world around us smell unpleasant, a new study has suggested.
Researchers from the University of Wisconsin-Madison used powerful brain imaging technologies to examine how stress and anxiety "re-wire" the brain.
A team of psychologists led by Professor Wen Li discovered that when a person experiences stress, emotion systems and olfactory processing in the brain become linked, making inoffensive smells become unpleasant.
Although the emotion and olfactory systems within the brain are usually found next to each other, there is rarely 'crosstalk' between the two.
Writing in the Journal of Neuroscience, Prof Li said results from their research will now help to uncover the biological mechanisms at work when a person feels stressed.
Using functional MRI scans, the team analysed the brain activity of 12 participants after showing them images designed to induce anxiety as they smelled familiar, neutral odours.
The subjects were then asked to rate the different smells before being shown the disturbing image and afterwards. The majority showed a more negative response to odours that they had previously considered neutral.
This fuels a 'feedback loop' that heightens distress, and can even lead to clinical issues such as depression.
Prof Li explained: "After anxiety induction, neutral smells become clearly negative."
“In typical odor processing, it is usually just the olfactory system that gets activated,” says Li. “But when a person becomes anxious, the emotional system becomes part of the olfactory processing stream.
“We encounter anxiety and as a result we experience the world more negatively. The environment smells bad in the context of anxiety. It can become a vicious cycle, making one more susceptible to a clinical state of anxiety as the effects accumulate. It can potentially lead to a higher level of emotional disturbances with rising ambient sensory stress.”
Prof Li said the findings of the study could help scientists gain a better understanding of the dynamic nature of smell perception and biology of anxiety.
- 1 Australia to impose 24-hour curfew on all cats to protect endangered species
- 2 Model's video shoot on the beach interrupted by sudden landing of a group of illegal migrants
- 3 The difference between a psychopath and a sociopath
- 4 MH370: Boeing 777 wing that could match missing plane found on the French island of Reunion
Kate Winslet thanked 'particularly horrible' girl who bullied her at school after Titanic success
Israel accused of killing 75 children during day of 'carnage' and war crimes in Gaza war
Australia to impose 24-hour curfew on all cats to protect endangered species
Walter Palmer: Cecil the lion killer revealed to be American dentist
MH370: Boeing 777 wing that could match missing plane found on the French island of Reunion
Yvette Cooper: Our choice is years of Tory rule under Jeremy Corbyn – or a return to a Labour government
Labour leadership contender Jeremy Corbyn says 'we can learn a great deal from Karl Marx'
I am the Jeremy Corbyn supporter that many will tell you doesn't exist
Public anger after French sunbather beaten up by gang for wearing a bikini in Reims park
Labour leadership: New poll shows party is now even 'less electable' than under Ed Miliband
Labour leadership contest: I would never quit the party, says Liz Kendall
£20000 - £25000 per annum + competitive: SThree: SThree are a global FTSE 250...
£17900 - £20300 per annum: Recruitment Genius: An enthusiastic Marketing Assis...
£24000 - £25000 per annum: Recruitment Genius: This contract caterer is proud ...
£16000 - £20000 per annum: Recruitment Genius: A fantastic and exciting opport...