Navigation Links
Brainy courage of the rainbowfish
Date:4/10/2014

The boldest black-lined rainbowfish are those that are born in the wild. Also more fearless are those that analyze information both sides of their brains. This is the conclusion of Australian researchers Culum Brown and Anne-Laurence Bibost from Macquarie University, in a study published in Springer's journal Behavioral Ecology and Sociobiology.

The preference to analyze and react to information with either the left or right hemisphere of the brain is called cerebral lateralization, and is widespread among vertebrates. Lateralization is seen in the preference of humans or parrots to use one hand or claw over the other or to always turn to the same side when moving around objects.

The researchers first tested wild rainbowfish against captive rainbowfish. They then used a modified version of the mirror test to find out if a fish showed a lateral preference to view itself with either its left or right eye. Levels of boldness were tested by timing how long it took a fish to emerge from a safe hiding place.

Non-lateralized fish that did not analyze information in a specific brain hemisphere were significantly bolder than both left- and right-lateralized fish. This suggests that fear is heightened when primarily processed by a single hemisphere, making lateralized fish less bold. Previous studies have shown that complex tasks are more difficult to perform when information processing is shared between two brain hemispheres. It therefore boils down to a question of speed. A non-lateralized fish in a potentially life-threatening situation must first draw information from both hemispheres, and compare and integrate it before it can make a decision. Strongly lateralized fish, on the other hand, can act more quickly because they only draw on information from a single hemisphere.

If non-lateralized fish process fear-related stimuli comparatively slowly or inefficiently, it may be that the moderating effect of fear is somewhat lessened in comparison to strongly lateralized fish. The researchers think this may result in a reduced level of fear generally, or perhaps the decision to explore is already made before the moderating effect of fear comes into play. Either scenario would adequately explain their observation that non-lateralized fish are bolder than lateralized fish.

The researchers were not surprised that wild fish were significantly bolder than captive-reared fish, as previous work they had done showed that populations that are hunted by predators were braver than those from low-predation areas.

"The similarities between personality and laterality are certainly intriguing and hint at a single underlying function or mechanism," says Brown. "We suggest that these aspects of personality traits are actually caused by variation in laterality."


'/>"/>

Contact: Renate Bayaz
renate.bayaz@springer.com
49-622-148-78531
Springer
Source:Eurekalert

Related biology news :

1. Brainy beverage: Study reveals how green tea boosts brain cell production to aid memory
2. Starting a family does not encourage parents to eat healthier
3. Begin early: Researchers say water with meals may encourage wiser choices
4. Want to encourage eco-friendly behavior? Give consumers a nudge (Dont tell them what to do)
5. An energy conscious workforce: New research looks at how to encourage staff to go green
6. Hypertension researcher encourages colleagues to expand their focus
7. Moderate exercising encourages a healthier lifestyle
8. Most schools meet USDA drinking water mandate; more steps needed to encourage consumption
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/15/2016)... LONDON , Dec. 15, 2016 /PRNewswire/ ... the driving experience, health wellness and wellbeing ... As one in three new passenger vehicles ... voice recognition, gesture recognition, heart beat monitoring, ... eyelid monitoring, facial monitoring, and pulse detection. ...
(Date:12/15/2016)... "Increase in mobile transactions is driving the ... market is expected to grow from USD 4.03 billion ... a CAGR of 29.3% between 2016 and 2022. The ... demand for smart devices, government initiatives, and increasing penetration ... is expected to grow at a high rate during ...
(Date:12/8/2016)... , Dec. 8, 2016 Market Research Future published ... Market. The global Mobile Biometric Security and Service Market is expected ... to 2022. Market Highlights: ... , , Mobile Biometric ... due to the increasing need of authentication and security from unwanted ...
Breaking Biology News(10 mins):
(Date:1/16/2017)... Jan. 16, 2017  Eurofins Genomics today announced the ... more customers to receive their primers in a shorter ... in quality found with other providers. Express oligos are ... at no additional fee. Researchers ... studies, including DNA sequencing, genotyping, site-directed mutagenesis, and cloning. ...
(Date:1/13/2017)... Michigan (PRWEB) , ... January 13, 2017 , ... ... and market products containing an organic compound called fulvic acid that farms, greenhouses ... Hydroponics operations that grow cannabis are among the fastest growing segments of customers ...
(Date:1/12/2017)... Yorba Linda, Ca (PRWEB) , ... ... ... demand for low-cost, disposable devices with short response times capable of performing ... and food fields, disposable screen-printed electrodes provide fast, sensitive detection and quantification ...
(Date:1/12/2017)... , January 12, 2017 A new report published by ... Users - Global Opportunity Analysis and Industry Forecast, 2014-2022," projects that the global in ... 2015, growing at a CAGR of 15.07% during the forecast period. ... ... ...
Breaking Biology Technology: