Scientists pinpoint olfactory influences
Source: Agencies |
November 7, 2009, Saturday
|
Print Edition
Print Edition
THE aromas of grandmother's fresh-baked cookies etch themselves into the brain's emotional memory, but so does a whiff of rotten fish, Israeli scientists said in a finding that might help in treating trauma patients.
They said bad smells make the biggest first impression -- which is likely an evolutionary defense mechanism -- but early pleasant scents also make an imprint.
"We found that the first pairing or association between an object and a smell had a distinct signature in the brain," even in adults, Yaara Yeshurun of the Weizmann Institute of Science in Israel, whose study appears in the journal Current Biology, said in a statement.
"This 'etching' of initial odor memories in the brain was equal for good and bad smells, yet was unique to odor."
To test smell-related memories, the researchers presented a group of volunteers with a set of objects, and then associated each with a smell and a sound.
Some of the smells and sounds were pleasant, such as a pear or a guitar, and others were unpleasant, such as a dead fish or the screech of a power drill.
A week later, they asked people to recall the objects and found people tended to remember the unpleasant associations best, whether they were smells or sounds.
Next, they did similar experiments while people's brains were being scanned using functional magnetic resonance imaging.
In these experiments, they noticed that a part of the hippocampus and amygdala lit up when smells were first associated with a new object, but not sounds.
They said the findings could lead to better ways to help improve memories, or help erase early, traumatic memories.
They said bad smells make the biggest first impression -- which is likely an evolutionary defense mechanism -- but early pleasant scents also make an imprint.
"We found that the first pairing or association between an object and a smell had a distinct signature in the brain," even in adults, Yaara Yeshurun of the Weizmann Institute of Science in Israel, whose study appears in the journal Current Biology, said in a statement.
"This 'etching' of initial odor memories in the brain was equal for good and bad smells, yet was unique to odor."
To test smell-related memories, the researchers presented a group of volunteers with a set of objects, and then associated each with a smell and a sound.
Some of the smells and sounds were pleasant, such as a pear or a guitar, and others were unpleasant, such as a dead fish or the screech of a power drill.
A week later, they asked people to recall the objects and found people tended to remember the unpleasant associations best, whether they were smells or sounds.
Next, they did similar experiments while people's brains were being scanned using functional magnetic resonance imaging.
In these experiments, they noticed that a part of the hippocampus and amygdala lit up when smells were first associated with a new object, but not sounds.
They said the findings could lead to better ways to help improve memories, or help erase early, traumatic memories.
- About Us
- |
- Terms of Use
- |
-
RSS - |
- Privacy Policy
- |
- Contact Us
- |
- Shanghai Call Center: 962288
- |
- Tip-off hotline: 52920043
- 沪ICP证：沪ICP备05050403号-1
- |
- 互联网新闻信息服务许可证：31120180004
- |
- 网络视听许可证：0909346
- |
- 广播电视节目制作许可证：沪字第354号
- |
- 增值电信业务经营许可证：沪B2-20120012
Copyright © 1999- Shanghai Daily. All rights reserved.Preferably viewed with Internet Explorer 8 or newer browsers.
