Navigation Links
Our brains are more like birds' than we thought
Date:7/2/2010

For more than a century, neuroscientists believed that the brains of humans and other mammals differed from the brains of other animals, such as birds (and so were presumably better). This belief was based, in part, upon the readily evident physical structure of the neocortex, the region of the brain responsible for complex cognitive behaviors.

A new study, however, by researchers at the University of California, San Diego School of Medicine finds that a comparable region in the brains of chickens concerned with analyzing auditory inputs is constructed similarly to that of mammals.

"And so ends, perhaps, this claim of mammalian uniqueness," said Harvey J. Karten, MD, professor in the Department of Neurosciences at UCSD's School of Medicine, and lead author of the study, published this week in the Proceedings of the National Academy of Sciences Online Early Edition.

Generally speaking, the brains of mammals have long been presumed to be more highly evolved and developed than the brains of other animals, in part based upon the distinctive structure of the mammalian forebrain and neocortex a part of the brain's outer layer where complex cognitive functions are centered.

Specifically, the mammalian neocortex features layers of cells (lamination) connected by radially arrayed columns of other cells, forming functional modules characterized by neuronal types and specific connections. Early studies of homologous regions in nonmammalian brains had found no similar arrangement, leading to the presumption that neocortical cells and circuits in mammals were singular in nature.

For 40 years, Karten and colleagues have worked to upend this thinking. In the latest research, they used modern, sophisticated imaging technologies, including a highly sensitive tracer, to map a region of the chicken brain (part of the telencephalon) that is similar to the mammalian auditory cortex. Both regions handle listening duties. They discovered that the avian cortical region was also composed of laminated layers of cells linked by narrow, radial columns of different types of cells with extensive interconnections that form microcircuits that are virtually identical to those found in the mammalian cortex.

The findings indicate that laminar and columnar properties of the neocortex are not unique to mammals, and may in fact have evolved from cells and circuits in much more ancient vertebrates.

"The belief that cortical microcircuitry was a unique property of mammalian brains was largely based on the lack of apparent lamination in other species, and the widespread notion that non-mammalian vertebrates were not capable of performing complex cognitive and analytic processing of sensory information like that associated with the neocortex of mammals," said Karten.

"Animals like birds were viewed as lovely automata capable only of stereotyped activity."

But this kind of thinking presented a serious problem for neurobiologists trying to figure out the evolutionary origins of the mammalian cortex, he said. Namely, where did all of that complex circuitry come from and when did it first evolve?

Karten's research supplies the beginnings of an answer: From an ancestor common to both mammals and birds that dates back at least 300 million years.

The new research has contemporary, practical import as well, said Karten. The similarity between mammalian and avian cortices adds support to the utility of birds as suitable animal models in diverse brain studies.

"Studies indicate that the computational microcircuits underlying complex behaviors are common to many vertebrates," Karten said. "This work supports the growing recognition of the stability of circuits during evolution and the role of the genome in producing stable patterns. The question may now shift from the origins of the mammalian cortex to asking about the changes that occur in the final patterning of the cortex during development."


'/>"/>

Contact: Scott LaFee
slafee@ucsd.edu
619-543-6163
University of California - San Diego
Source:Eurekalert

Related medicine news :

1. Novel radiotracer shines new light on the brains of Alzheimers disease patients
2. Tool manipulation is represented similarly in the brains of the blind and the sighted
3. Gay mens bilateral brains better at remembering faces: York U study
4. Adolescent brains biologically wired to engage in risky behavior, study finds
5. Blood flows differently through the brains of schizophrenic patients
6. SKyPRO Releases Public Beta of GWTalk at BrainShare
7. Morphine May Protect Brains of People With HIV
8. SharpBrains Launches First Brain Fitness Innovation Awards to Recognize Neuroplasticity Pioneers
9. Scientists Tweak Subjects Brains to Alter Their Moral Choices
10. MessageSolution First in the Market to Offer All-in-One, Integrated Cloud-Based Archiving for Email, File Systems and SharePoint at Novell BrainShare 2010
11. iPhone Memory Aid for Scatterbrains, Aging Baby Boomers and Busy, Forgetful People
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/26/2017)... ... 26, 2017 , ... Leading CEOs from biotech, pharmaceutical, and ... 31st at The Four Seasons Hotel Boston. , The Boston CEO Conference ... exclusive access to key decision makers who influence deal making and investment. Attendees ...
(Date:5/26/2017)... ... 26, 2017 , ... Somnoware, a leading provider of digital ... its Somnoware Sleep Device Interface (SDI). Somnoware SDI is a sleep device integration ... platform, initializing devices and importing studies are just one-click operations. This plugin streamlines ...
(Date:5/26/2017)... ... May 26, 2017 , ... via ... antimicrobial, mesh back 24/7 task chair specifically designed for clinical areas. Genie Copper ... thrilled to partner with Cupron® to provide customers with a game changing chair ...
(Date:5/26/2017)... ... , ... Yisrayl Hawkins, Pastor and Overseer at The House of Yahweh in ... Peace Agreements being discussed by President Donald Trump and the rest of the world. ... speed up peace talks in the continuous battle between Israel and Palestine. The world’s ...
(Date:5/26/2017)... Francisco, CA (PRWEB) , ... May 26, 2017 , ... ... Francisco, is proud to announce a new, informational blog post on insurance options. If ... surgery, checking insurance plans may help save time and money. Visiting an in-network provider ...
Breaking Medicine News(10 mins):
(Date:5/9/2017)... 9, 2017  Oramed Pharmaceuticals Inc. (NASDAQ: ... pharmaceutical company focused on the development of oral ... Intellectual Property Office has granted Oramed a patent ... Exenatide". The patent covers Oramed,s invention of an ... is an incretin hormone that stimulates the secretion ...
(Date:5/8/2017)... May 8, 2017  Diplomat Pharmacy, Inc. (NYSE: DPLO)., ... ("WRB"), a health care service center company based ... WRB specializes in relationship management programs for leading pharmaceutical ... WRB will join Envoy Health ... services for manufacturers, biotech firms, and other service companies. ...
(Date:5/6/2017)... May 5, 2017  Hill-Rom Holdings, Inc. (NYSE: HRC), ... 100,000 square feet to its Welch Allyn campus. ... commitment to bring more than 100 new jobs to ... Allyn has maintained a significant presence for more than ... new positions, a large portion of which will be ...
Breaking Medicine Technology: