Featured Research

from universities, journals, and other organizations

Evolutionary explanation for why some lessons more easily learned than others

Date:
August 4, 2014
Source:
University of Minnesota
Summary:
It's easy to guess why it doesn't take long to learn to avoid certain behaviors and embrace others. But how do we know what drives these predilections? A new study offers insight into the evolutionary underpinning of animals' innate ability to quickly absorb critical life lessons.

It's easy to guess why it doesn't take long to learn to avoid certain behaviors and embrace others. But how do we know what drives these predilections? A study led by Aimee Dunlap at the University of Missouri-St. Louis, and co-authored by University of Minnesota researcher David Stephens, offers insight into the evolutionary underpinning of animals' innate ability to quickly absorb critical life lessons.

Related Articles


Animals are flooded with stimuli, but survival often depends on their ability to form specific associations that enhance fitness while ignoring others entirely. Psychologists have a name for it: the Garcia Effect. In the 1960s, John Garcia showed that rats are primed to learn certain associations (taste and illness) and not others (light and illness).

"Different learning abilities evolved in different environments, and we had a hypothesis about how that should happen," says Stephens. "What we wanted to know the general properties that cause natural selection to favor some learned associations over others."

Dunlap and Stephens tested their hypothesis using techniques associated with experimental evolution. "Experimental evolution is different than artificial selection," says Stephens. Instead of selecting for specific traits, the idea is to create specific environments and ask whether they generate selection in the predicted way.

By testing their hypothesis over 40 generations of fruit flies in environments designed to evoke specific associations (between quinine and color or odor). They were able to produce some populations of flies who learned quinine-color associations, and others who learned quinine-odor association. This confirmed the hypothesis that statistical reliability across many generations of selection determines what animals can learn and what they can't.

"We're coming to know quite a lot about the underlying neural and molecular biological mechanisms that cause associations to form," says Stephens. "If you know odor makes a stronger association for this population and color for that population, that raises a really interesting mechanistic question of what's happening inside the neural systems of these flies -- how these different learning abilities arise."


Story Source:

The above story is based on materials provided by University of Minnesota. Note: Materials may be edited for content and length.


Journal Reference:

  1. A. S. Dunlap, D. W. Stephens. Experimental evolution of prepared learning. Proceedings of the National Academy of Sciences, 2014; DOI: 10.1073/pnas.1404176111

Cite This Page:

University of Minnesota. "Evolutionary explanation for why some lessons more easily learned than others." ScienceDaily. ScienceDaily, 4 August 2014. <www.sciencedaily.com/releases/2014/08/140804123402.htm>.
University of Minnesota. (2014, August 4). Evolutionary explanation for why some lessons more easily learned than others. ScienceDaily. Retrieved November 24, 2014 from www.sciencedaily.com/releases/2014/08/140804123402.htm
University of Minnesota. "Evolutionary explanation for why some lessons more easily learned than others." ScienceDaily. www.sciencedaily.com/releases/2014/08/140804123402.htm (accessed November 24, 2014).

Share This


More From ScienceDaily



More Fossils & Ruins News

Monday, November 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Ruins Thought To Be Port Actually Buried Greek City

Ruins Thought To Be Port Actually Buried Greek City

Newsy (Nov. 24, 2014) — Media is calling it an "underwater Pompeii." Researchers have found ruins off the coast of Delos. Video provided by Newsy
Powered by NewsLook.com
Amphipolis Tomb Architraves Reveal Faces

Amphipolis Tomb Architraves Reveal Faces

AFP (Nov. 22, 2014) — Faces in an area of mosaics is the latest find by archaeologists at a recently discovered tomb dating back to fourth century BC and the time of Alexander the Great in Greece. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com
US Returns Looted Artifacts to Thailand

US Returns Looted Artifacts to Thailand

AFP (Nov. 19, 2014) — The United States has returns over 500 vases, bowls, axes, and other ancient artifacts mostly from the Ban Chiang archaeological site which were illegally looted from Thailand decades ago. Duration: 01:13 Video provided by AFP
Powered by NewsLook.com
How To Search Through Every Public Tweet Sent Since 2006

How To Search Through Every Public Tweet Sent Since 2006

Newsy (Nov. 19, 2014) — Twitter has announced improvements to its search index that allow users to search through every public tweet sent since its inception in 2006. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins