Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

The protective brain hypothesis is confirmed

19.07.2010
"In the past, it was thought that one of the selective advantages of having a large brain is that it facilitates the development of new behaviour to respond to the ecological challenges that the individual has not experienced before, such as a sudden reduction in food or the appearance of a new predator ", César González-Lagos, main author of the study and researcher at the Centre of Ecological Research and Forestry Applications (CREAF) associated with the Autonomous University of Barcelona, highlights to SINC.

The results, which are published in the Journal of Evolutionary Biology, reveal that "species which have developed large brains live for longer than those with small brains, as the protective brain theory suggests, and therefore, can reproduce more times", the researcher stresses.

If the animal is protected by a large brain, this results in greater survival and a longer life. "However until recently there has been little evidence and there had been no agreement on whether species with larger brains live longer", the scientist points out.

According to this hypothesis, the brain would adopt a "protective" role which would help to reduce mortality and lengthen the reproductive live of the individuals, thereby compensating the energetic and development costs associated with a large brain.

The evidence is correlative, not cause-effect

The team analysed 493 species of mammals from different regions of the planet. According to the authors, the evidence resulting from the study is "correlative", in other words they do not "necessarily" indicate cause-effect, but the analysis indicates that the link between a large brain and longevity is not only due to the fact that species with large brains are greater in size and develop more slowly, they also live in specific regions or share the same evolutionary ancestors.

"As extension of life duration is central to many hypotheses on the advantages of developing large brains, these results offer a solid base which can be used to continue building a general theory on the evolution of the brain", concludes the scientist.

The first observations of Darwin

Throughout their evolutionary history some mammals, such as primates, cetaceans and elephants, have developed much larger brains than would be expected for their body size. But a large brain involves energetic costs and development time.

In El descendiente del Hombre (The descendent of Man) (1871), the British naturalist Charles Darwin, always attracted by this question, thought that a large brain, such as that of humans, improved the mental capacity of individuals, because natural selection favours the appearance of large brains.

Darwin believed that with a large brain mental capacity is improved. But, what selective advantage does it offer? The controversy on the advantages of having a larger brain continues.

Bibliographical reference: Gonzalez-Lagos, C.; Sol, D.; Reader, S.M. "Large-brained mammals live longer" Journal of Evolutionary Biology 23(5): 1064-1074, May 2010. doi:10.1111/j.1420-9101.2010.01976.x

SINC | EurekAlert!
Further information:
http://www.plataformasinc.es

More articles from Life Sciences:

nachricht Zebrafish's near 360 degree UV-vision knocks stripes off Google Street View
22.06.2018 | University of Sussex

nachricht New cellular pathway helps explain how inflammation leads to artery disease
22.06.2018 | Cedars-Sinai Medical Center

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Temperature-controlled fiber-optic light source with liquid core

In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.

Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...

Im Focus: Overdosing on Calcium

Nano crystals impact stem cell fate during bone formation

Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Graphene assembled film shows higher thermal conductivity than graphite film

22.06.2018 | Materials Sciences

Fast rising bedrock below West Antarctica reveals an extremely fluid Earth mantle

22.06.2018 | Earth Sciences

Zebrafish's near 360 degree UV-vision knocks stripes off Google Street View

22.06.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>