Navigation Links
In the mind's eye: How the brain makes a whole out of parts

When a human looks at a number, letter or other shape, neurons in various areas of the brain's visual center respond to different components of that shape, almost instantaneously fitting them together like a puzzle to create an image that the individual then "sees" and understands, researchers at The Johns Hopkins University report.

A team from the university's Zanvyl Krieger Mind/Brain Institute describes the complex but speedy process in detail in a recent issue of the journal Neuron.

The question of how the brain sees, recognizes and understands objects is one of the most intriguing in neuroscience, associate professor and paper co-author Charles E. Connor said.

"This may not even seem like a scientific question to some people, because seeing is so automatic and we are so good at it ?far better than the best computer vision systems yet devised," Connor said. "That is because a large part of the human brain is devoted to interpreting objects in our world, so that we have the necessary information for interacting with our environment.

"Vision doesn't happen in the eye," Connor said. "It happens at multiple processing stages in the brain. We study how objects are signaled or encoded by large populations of neurons at higher-level stages in the object-processing part of the brain."

The report, based on recordings of nerve cells in the visual cortex of macaque monkeys, reveals that neurons in the higher-level visual cortex at first respond to a visual stimulus "somewhat indiscriminately," signaling all the individual features within a shape to which they are sensitive. For instance, a particular neuron may respond to objects with either a concave fragment at the top or a convex fragment at the bottom. At this point, the neural signals are ambiguous; the brain doesn't know whether the concavity, the convexity or both are present.

Milliseconds later, however, neurons begin to react exclusively to combinations of shape fr agments, rather than to individual fragments. In other words, the brain begins to put the pieces together to form larger sections, in the same way that an artisan might fasten discrete shards of stained glass to create a design.

"Humans do a rough categorization of objects very quickly," Connor said. "For instance, in just a tenth of a second, we can recognize whether something we see is an animal or not. Our results show that this immediate, rough impression probably depends on recognizing just one or more individual parts of what we see. Fine discriminations ?such as recognizing individual faces ?take longer to happen, and our study suggests that this delay depends upon emerging signals for combinations of shape fragments. In a sense, the brain has to construct an internal representation of an object from disparate pieces."

In the long term, understanding exactly how the brain processes information may lead to neural prostheses ?artificial replacements for lost sensory, motor and perhaps even memory and cognitive functions. In the short term, such work is driven by curiosity about one of the fundamental mysteries: how the brain works.

"Our ability to see is one of the great evolutionary accomplishments of the human brain," Connor said. "We still don't know how the visual system accomplishes this marvel of information processing. Such experiments are beginning to reveal how large networks of neurons in the brain extract meaning from the eye image."


'"/>

Source:Johns Hopkins University


Related biology news :

1. Finding the minds eye
2. Controversial drug shown to act on brain protein to cut alcohol use
3. Mouse brain cells rapidly recover after Alzheimers plaques are cleared
4. Mouse brain tumors mimic those in human genetic disorder
5. New imaging method gives early indication if brain cancer therapy is effective, U-M study shows
6. First atlas of key brain genes could speed research on cancer, neurological diseases
7. NYU study reveals how brains immune system fights viral encephalitis
8. Stem cells from brain transformed to produce insulin at Stanford
9. Birds brains reveal source of songs
10. Loves all in the brain: fMRI study shows strong, lateralized reward, not sex, drive
11. Revolutionary nanotechnology illuminates brain cells at work
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/22/2016)... March 22, 2016 ... Sensors Market for Consumer Industry by Type (Image, ... Application (Communication & IT, Entertainment, Home Appliances, ... Forecast to 2022", published by MarketsandMarkets, the ... to reach USD 26.76 Billion by 2022, ...
(Date:3/15/2016)... -- --> --> According ... "Digital Door Lock Systems Market - Global Industry Analysis, Size, ... digital door lock systems market in terms of revenue was ... to grow at a CAGR of 31.8% during the period ... (MSMEs) across the world and high industrial activity driving inclusive ...
(Date:3/11/2016)... PUNE, India , March 11, 2016 ... to a new market research report "Image Recognition Market ... by Application (Marketing and Advertising), by Deployment Type (On-Premises ... Global Forecast To 2022", published by MarketsandMarkets, the global ... in 2015 to USD 29.98 Billion by 2020, at ...
Breaking Biology News(10 mins):
(Date:5/25/2016)... ... May 25, 2016 , ... ... and Drug Administration (FDA) has granted the company’s orphan drug designation request covering ... orphan drug designation granted by the FDA. , Spinocerebellar ataxia is a ...
(Date:5/24/2016)... , ... May 24, 2016 , ... Last week, Callan ... corporate executives and entrepreneurs, held The Future of San Diego Life Science event at ... Diego life science community attended the event with speakers Dr. Rich Heyman, former CEO ...
(Date:5/23/2016)... ... 23, 2016 , ... PrecisionAg® Media has released its latest ... The paper outlines the key trends that are creating both opportunities and challenges ... lot of highs and lows as the precision agriculture market has grown and ...
(Date:5/23/2016)... and LONDON , May 23, 2016 /PRNewswire/ ... See Frontage Boost Efficiency by 40% - Frontage Implement ... - Frontage Enforce Quality, Compliance and Traceability Within the Bioanalytical lab ... labs in the United States and ... to be deployed across its laboratory facilities. In addition to serving ...
Breaking Biology Technology: