HOME >> BIOLOGY >> NEWS
Brain differences in adolescents, psychopaths, lend to their impulsive, risk-taking behavior

ficity for targeting brain regions heavily innervated by the midbrain dopamine system. Other recent research has suggested that dopamine may play a role in the learning of behaviors associated with reward and pleasure. Consistent with this view, the model demonstrated that when the rewards were administered in an unpredictable manner, a key reward structure of the brain--the striatum--was more active, suggesting that "reward" to the brain may have more to do with the predictability of an event than with how pleasurable it is.

"These studies suggest that adolescent decisions may, in part, be due to a greater biological sensitivity to either rewards themselves or, more likely, the novelty of rewards," says Berns. "It is possible that a reward or novelty associated with the reward may trigger hyperactivity in still developing brain reward structures and circuits."

Another study found differences in risk-taking behaviors in pubescent rats. Georgia Hodes, a graduate student at Rutgers University working with Tracey J. Shors, PhD, used an elevated plus maze to study exploratory behavior of male and female rats before, during, and after puberty. The maze contained "safe" (closed and darker) areas and more "anxiety-provoking" (open and exposed) areas. The researchers analyzed videotapes of rats as they maneuvered freely through the maze during 10-minute sessions. The elevated plus maze is a task used to measure anxiety, which is created by the conflict between the animal's desire to explore and its fear of open spaces. An animal's entering the exposed areas of the maze indicates lower anxiety, while extension of the rat's head into the open area without actually entering it (stretched attenuated posture) indicates assessment of risk.

The researchers found that both male and female pubescent rats were more likely to enter and spent more time in the open and exposed areas than did the adult male and female rats, suggesting that
'"/>

Contact: Leah Ariniello
dawn@sfn.org
202-462-6688
Society for Neuroscience
24-Oct-2004


Page: 1 2 3 4 5

Related biology news :

1. Brain blood flow gives clues to treating depression
2. Brains hearing center may reorganize after implant of cochlear device
3. Brains inertial navigation system pinpointed
4. Brain, size and gender surprises in latest fossil tying humans, apes and monkeys
5. Brains reflect sex differences
6. Brain networks strengthened by closing ion channels
7. Brain tumors coax important support from nearby immune system cells
8. Brain tissue reveals possible genetic trigger for schizophrenia
9. Brain fends off distractions
10. Brain works more chaotically than previously thought
11. Brain maps online

Post Your Comments:
(Date:10/16/2014)... have challenged conventional thinking on how the bowel lining ... for how bowel cancer starts. , The researchers produced ... regenerating the ,crypts, that are a feature of the ... in bowel cancer development, a controversial finding as scientists ... Using 3D imaging technologies, Dr Chin Wee Tan and ...
(Date:10/16/2014)... causes severe respiratory tract infections and worldwide claims ... at VIB and Ghent University have succeeded in ... common virus infection. , Xavier Saelens (VIB/UGent): ... the way for the development of a novel ... causes suffering in numerous small children and elderly ...
(Date:10/16/2014)... -- NXT-ID, Inc. (NASDAQ: NXTD and ... focused on the growing mobile commerce market announces that ... Smart Wallet, at the 13 th annual Future ... conference on the intersection of technology and the economy. ... founder and publisher of the Strategic News Service™, the ...
Breaking Biology News(10 mins):Cryptic clues drive new theory of bowel cancer development 2New perspectives for development of an RSV vaccine 2NXT-ID Inc. to Present at 13th Annual FiRe Conference 2NXT-ID Inc. to Present at 13th Annual FiRe Conference 3
(Date:10/19/2014)... 2014 The Latin American hardware encryption ... Latin America with analysis and forecast of revenue. This ... is expected to reach $2,366.8 million by 2018, at ... Browse through the TOC of the Latin American hardware ... in-depth analysis provided. It also provides a glimpse of ...
(Date:10/19/2014)... (PRWEB) October 19, 2014 The Asian ... in Asian with analysis and forecast of revenue. The ... grow to around $463.9 million by 2018, at a ... Browse through the TOC of the Asian Automatic patient ... analysis provided. This also provides a glimpse of the ...
(Date:10/19/2014)... October 19, 2014 The report ... & Homeland Security), Technology, Payload, Type & by ... segments the global unmanned ground vehicle market into ... forecasting of market sizes. The report also identifies ... opportunities impacting it along with the adoption trends. ...
(Date:10/18/2014)... The report "1,6-Hexanediol Market by Application ... 2019", analyzes the global market on the basis ... industry details such as the key drivers, current ... , Browse 81 Market Data Tables and 29 ... on “1,6-Hexanediol Market by Application and by Geography ...
Breaking Biology Technology:The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 2The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 3The Asian Automatic patient billing market is estimated to grow to around $463.9 million by 2018 - New Report by MicroMarket Monitor 2The Asian Automatic patient billing market is estimated to grow to around $463.9 million by 2018 - New Report by MicroMarket Monitor 3Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 2Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 3Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 4Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 51,6-Hexanediol Market Projected to Reach $916.1 Million at a CAGR of 8.3% by 2019 – Report by MarketsandMarkets 21,6-Hexanediol Market Projected to Reach $916.1 Million at a CAGR of 8.3% by 2019 – Report by MarketsandMarkets 31,6-Hexanediol Market Projected to Reach $916.1 Million at a CAGR of 8.3% by 2019 – Report by MarketsandMarkets 41,6-Hexanediol Market Projected to Reach $916.1 Million at a CAGR of 8.3% by 2019 – Report by MarketsandMarkets 5
Cached News: