New treatments for stress and anxiety may be possible after scientists worked out how the brain assigns positive or negative emotions to memories.
It may sound like the realms of science fiction, but an American research team has discovered a molecule in the brain responsible for associating good or bad feelings with a memory.
They say their findings, published in the journal Nature, pave the way for a better understanding of why some people are more likely to retain negative emotions than positive ones - as can happen with anxiety, depression or post-traumatic stress disorder (PTSD).
Senior author Professor Kay Tye, of the Salk Institute's Systems Neurobiology Laboratory, said: “We’ve basically gotten a handle on the fundamental biological process of how you can remember if something is good or bad.
“This is something that’s core to our experience of life, and the notion that it can boil down to a single molecule is incredibly exciting.”
She explained that for a human or animal to learn whether to avoid, or seek out, a particular experience again in the future, their brain must associate a positive or negative feeling - or “valence” - with that stimulus.
The brain’s ability to link these feelings with memories is called “valence assignment.”
In 2016, Prof Tye discovered that a group of neurons in the brain’s basolateral amygdala (BLA) helps assign valence when mice are learning.
One set of BLA neurons was activated with positive valence, as the animals learned to associate a tone with a sweet taste.
A separate set of BLA neurons was activated with negative valence, as the animals learned to associate a different tone with a bitter taste.
Prof Tye said: “We found these two pathways - analogous to railroad tracks - that were leading to positive and negative valence, but we still didn’t know what signal was acting as the switch operator to direct which track should be used at any given time."
In the latest study, Prof Tye's team homed in on the importance of the signaling molecule neurotensin to the BLA neurons.
They already knew that neurotensin is a neuropeptide produced by the cells associated with valence processing, but so are a few other neurotransmitters.
The team used CRISPR gene editing approaches to selectively remove the gene for neurotensin from the cells - the first time that CRISPR has been used to isolate specific neurotransmitter function.
Without neurotensin signaling in the BLA, Prof Tye explained that mice could no longer assign positive valence and didn’t learn to associate the first tone with a positive stimulus.
She said: "Interestingly, the absence of neurotensin did not block negative valence.
"The animals instead became even better at negative valence, having a stronger association between the second tone and a negative stimulus.
"The findings suggest that the brain’s default state is to have a bias toward fear - the neurons associated with negative valence are activated until neurotensin is released, switching on the neurons associated with positive valence."
From an evolutionary perspective, Prof Tye says it "makes sense" because it helps people avoid potentially dangerous situations -and it probably resonates with people who tend to find the worst in a situation.
In further experiments, Prof Tye and her team showed that high levels of neurotensin promoted reward learning and dampened negative valence, further supporting the idea that neurotensin is responsible for positive valence.
Co-first author Hao Li, a postdoctoral fellow in the Tye Lab, added: “We can actually manipulate this switch to turn on positive or negative learning.
“Ultimately, we’d like to try to identify novel therapeutic targets for this pathway.”
The researchers still have questions about whether levels of neurotensin can be modulated in people’s brains to treat anxiety or PTSD.
They are also planning future studies to probe what other brain pathways and molecules are responsible for triggering the release of neurotensin.
Stories and infographics by ‘Talker Research’ are available to download & ready to use. Stories and videos by ‘Talker News’ are managed by SWNS. To license content for editorial or commercial use and to see the full scope of SWNS content, please email [email protected] or submit an inquiry via our contact form.
We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
Cookie
Duration
Description
__hssc
1 hour
HubSpot sets this cookie to keep track of sessions and to determine if HubSpot should increment the session number and timestamps in the __hstc cookie.
__hssrc
session
This cookie is set by Hubspot whenever it changes the session cookie. The __hssrc cookie set to 1 indicates that the user has restarted the browser, and if the cookie does not exist, it is assumed to be a new session.
_GRECAPTCHA
5 months 27 days
Google Recaptcha service sets this cookie to identify bots to protect the website against malicious spam attacks.
cookielawinfo-checkbox-advertisement
1 year
Set by the GDPR Cookie Consent plugin, this cookie records the user consent for the cookies in the "Advertisement" category.
cookielawinfo-checkbox-analytics
11 months
This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional
11 months
The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary
11 months
This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others
11 months
This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance
11 months
This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
CookieLawInfoConsent
1 year
CookieYes sets this cookie to record the default button state of the corresponding category and the status of CCPA. It works only in coordination with the primary cookie.
rc::a
never
This cookie is set by the Google recaptcha service to identify bots to protect the website against malicious spam attacks.
rc::b
session
This cookie is set by the Google recaptcha service to identify bots to protect the website against malicious spam attacks.
rc::c
session
This cookie is set by the Google recaptcha service to identify bots to protect the website against malicious spam attacks.
rc::f
never
This cookie is set by the Google recaptcha service to identify bots to protect the website against malicious spam attacks.
ts
1 year 1 month 1 day
PayPal sets this cookie to enable secure transactions through PayPal.
usprivacy
1 year 1 month
This is a consent cookie set by Dailymotion to store the CCPA consent string (mandatory information about an end-user being or not being a California consumer and exercising or not exercising its statutory right).
viewed_cookie_policy
11 months
The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Cookie
Duration
Description
__cf_bm
30 minutes
Cloudflare set the cookie to support Cloudflare Bot Management.
li_gc
5 months 27 days
Linkedin set this cookie for storing visitor's consent regarding using cookies for non-essential purposes.
lidc
1 day
LinkedIn sets the lidc cookie to facilitate data center selection.
UserMatchHistory
1 month
LinkedIn sets this cookie for LinkedIn Ads ID syncing.
v1st
1 year 1 month 1 day
The v1st cookie is set by TripAdvisor to collect details about how visitors use the website, by displaying user reviews, awards and information received on the TripAdvisor community.
yt-player-bandwidth
never
The yt-player-bandwidth cookie is used to store the user's video player preferences and settings, particularly related to bandwidth and streaming quality on YouTube.
yt-player-headers-readable
never
The yt-player-headers-readable cookie is used by YouTube to store user preferences related to video playback and interface, enhancing the user's viewing experience.
yt-remote-cast-available
session
The yt-remote-cast-available cookie is used to store the user's preferences regarding whether casting is available on their YouTube video player.
yt-remote-cast-installed
session
The yt-remote-cast-installed cookie is used to store the user's video player preferences using embedded YouTube video.
yt-remote-fast-check-period
session
The yt-remote-fast-check-period cookie is used by YouTube to store the user's video player preferences for embedded YouTube videos.
yt-remote-session-app
session
The yt-remote-session-app cookie is used by YouTube to store user preferences and information about the interface of the embedded YouTube video player.
yt-remote-session-name
session
The yt-remote-session-name cookie is used by YouTube to store the user's video player preferences using embedded YouTube video.
ytidb::LAST_RESULT_ENTRY_KEY
never
The cookie ytidb::LAST_RESULT_ENTRY_KEY is used by YouTube to store the last search result entry that was clicked by the user. This information is used to improve the user experience by providing more relevant search results in the future.
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Cookie
Duration
Description
_gat
1 minute
Google Universal Analytics sets this cookie to restrain request rate and thus limit data collection on high-traffic sites.
_p_hfp_client_id
less than a minute
Elfsight sets this cookie to implement social platforms on the website and enables the social platforms to track the users by assigning them a specific ID.
dmvk
session
The dmvk cookie is set by Dailymotion to record data of visitor behaviour on the website.
SRM_B
1 year 24 days
Used by Microsoft Advertising as a unique ID for visitors.
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Cookie
Duration
Description
__hstc
6 months
Hubspot set this main cookie for tracking visitors. It contains the domain, initial timestamp (first visit), last timestamp (last visit), current timestamp (this visit), and session number (increments for each subsequent session).
_clck
1 year
Microsoft Clarity sets this cookie to retain the browser's Clarity User ID and settings exclusive to that website. This guarantees that actions taken during subsequent visits to the same website will be linked to the same user ID.
_clsk
1 day
Microsoft Clarity sets this cookie to store and consolidate a user's pageviews into a single session recording.
_fbp
3 months
Facebook sets this cookie to display advertisements when either on Facebook or on a digital platform powered by Facebook advertising after visiting the website.
_ga
1 year 1 month 4 days
Google Analytics sets this cookie to calculate visitor, session and campaign data and track site usage for the site's analytics report. The cookie stores information anonymously and assigns a randomly generated number to recognise unique visitors.
_ga_*
1 year 1 month 4 days
Google Analytics sets this cookie to store and count page views.
_gat_gtag_UA_*
1 minute
Google Analytics sets this cookie to store a unique user ID.
_gcl_au
3 months
Google Tag Manager sets the cookie to experiment advertisement efficiency of websites using their services.
_gid
1 day
Google Analytics sets this cookie to store information on how visitors use a website while also creating an analytics report of the website's performance. Some of the collected data includes the number of visitors, their source, and the pages they visit anonymously.
AnalyticsSyncHistory
1 month
Linkedin set this cookie to store information about the time a sync took place with the lms_analytics cookie.
CLID
1 year
Microsoft Clarity set this cookie to store information about how visitors interact with the website. The cookie helps to provide an analysis report. The data collection includes the number of visitors, where they visit the website, and the pages visited.
CONSENT
2 years
YouTube sets this cookie via embedded YouTube videos and registers anonymous statistical data.
hubspotutk
6 months
HubSpot sets this cookie to keep track of the visitors to the website. This cookie is passed to HubSpot on form submission and used when deduplicating contacts.
ln_or
1 day
Linkedin sets this cookie to registers statistical data on users' behaviour on the website for internal analytics.
MR
7 days
This cookie, set by Bing, is used to collect user information for analytics purposes.
SM
session
Microsoft Clarity cookie set this cookie for synchronizing the MUID across Microsoft domains.
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
Cookie
Duration
Description
ANONCHK
10 minutes
The ANONCHK cookie, set by Bing, is used to store a user's session ID and verify ads' clicks on the Bing search engine. The cookie helps in reporting and personalization as well.
bcookie
1 year
LinkedIn sets this cookie from LinkedIn share buttons and ad tags to recognize browser IDs.
bscookie
1 year
LinkedIn sets this cookie to store performed actions on the website.
fr
3 months
Facebook sets this cookie to show relevant advertisements by tracking user behaviour across the web, on sites with Facebook pixel or Facebook social plugin.
IDE
1 year 24 days 1 minute
Google DoubleClick IDE cookies store information about how the user uses the website to present them with relevant ads according to the user profile.
li_sugr
3 months
LinkedIn sets this cookie to collect user behaviour data to optimise the website and make advertisements on the website more relevant.
muc_ads
1 year 1 month 4 days
Twitter sets this cookie to collect user behaviour and interaction data to optimize the website.
MUID
1 year 24 days
Bing sets this cookie to recognise unique web browsers visiting Microsoft sites. This cookie is used for advertising, site analytics, and other operations.
personalization_id
1 year 1 month 4 days
Twitter sets this cookie to integrate and share features for social media and also store information about how the user uses the website, for tracking and targeting.
test_cookie
15 minutes
doubleclick.net sets this cookie to determine if the user's browser supports cookies.
ttwid
1 year
Tiktok sets this cookie to keep track of user authentication and session information.
VISITOR_INFO1_LIVE
5 months 27 days
YouTube sets this cookie to measure bandwidth, determining whether the user gets the new or old player interface.
VISITOR_PRIVACY_METADATA
6 months
YouTube sets this cookie to store the user's cookie consent state for the current domain.
YSC
session
Youtube sets this cookie to track the views of embedded videos on Youtube pages.
yt-remote-connected-devices
never
YouTube sets this cookie to store the user's video preferences using embedded YouTube videos.
yt-remote-device-id
never
YouTube sets this cookie to store the user's video preferences using embedded YouTube videos.
yt.innertube::nextId
never
YouTube sets this cookie to register a unique ID to store data on what videos from YouTube the user has seen.
yt.innertube::requests
never
YouTube sets this cookie to register a unique ID to store data on what videos from YouTube the user has seen.