Navigation Links
NeuroImage: Multiplexing in the visual brain
Date:3/24/2011

This press release is available in German.

"Neurons synchronize with different partners at different frequencies" says Dr. Dirk Jancke, Neuroscientist at the Ruhr-University in Bochum, Germany. A new imaging technique enabled to show that such functioning results in distinct activity patterns overlaid in primary visual cortex. These patterns individually signal motion direction, speed, and orientation of object contours within the same network at the same time. Together with colleagues at the University of Osnabrck, the Bochum scientists successfully visualized such brain multiplexing using a modern real-time optical imaging method that exploits a specific voltage-sensitive dye.

Imaging with voltage-sensitive dye: A method to capture real-time brain dynamics

The dye incorporates in the brain cells' membrane and changes fluorescence whenever these receive or send electrical signals. Hence, high resolution camera systems allow to simultaneously capture activities of millions of nerve cells across several square millimeters across the brain.

First-time visualization of grating pattern motion across the brain surface

As a stimulus the researchers used simple oriented gratings with alternating black-white stripes drifting at constant speed across a monitor screen. These stimuli have been used for more than 50 years in visual neuroscience and still are conventionally applied in medical diagnostics. However, brain activity that signals both the grating's orientation and its motion simultaneously has not been detected so far. Such signals could now be demonstrated for the first time. Note that further computational steps including sophisticated analysis were needed before those smallest brain activity signals became visible.

Cortical mapping of object orientation

Optical imaging became state-of-the-art since it allows fine grained resolution of cortical pattern activity, so-called maps, in which local groups of active nerve cells represent grating orientation. Thereby, a particular grating orientation activates different groups of nerve cells resulting in unique patchy patterns. Their specific map layout encodes actual stimulus orientation.

Transfer of motion information through overlaid activity waves

Jancke: "Our novel imaging method furthermore captures propagating activity waves across these orientation maps. Hence, we additionally observe gratings moving in real-time across the brain. In this way, motion direction and speed can be estimated independently from orientation maps, which enables resolving ambiguities occurring in visual scenes of everyday life." The emerging spatial-temporal patterns could then individually be received and interpreted by other brain areas. To give a picture: a radio gets a permanent stream of broadcasts simultaneously. In order to listen to a particular station one has to choose only the channel to tune. For example, a following brain area might preferentially compute an object's orientation while others process its movement direction or speed simultaneously. In the future, the scientists hope to discover more of the brains real-time action when similar tools are used with increasing stimulus complexity: Naturalistic images are experienced so effortlessly in everyday life. Still it remains an intriguing question how the brain handles such complex data gaining a stable percept every moment in time.


'/>"/>

Contact: Dr. Dirk Jancke
jancke@neurobiologie.rub.de
49-234-322-7845
Ruhr-University Bochum
Source:Eurekalert  

Related medicine news :

1. Visual prostheses: Symposium to explore combining functional endpoints
2. Eye expo at UH offers resources to the visually impaired
3. JPEG for the mind: How the brain compresses visual information
4. Kids With Autism May Lack Key Visual Skills, Study Finds
5. U of M researchers find learning in the visual brain
6. Visual pattern preference may be indicator of autism in toddlers
7. CWRU study finds visually impaired people get insulin pen dosages right
8. Apptera Raises $10M to Grow Its Voice And Visual Mobile Ad Network
9. Researchers predict human visual attention using computer intelligence for the first time
10. Visually guided laser may be viable treatment for abnormal heartbeat
11. Life Coach and Author Thomas Finn's Highly Anticipated Book, 'A Better Tomorrow- Affirmations and Visualizations the Keys to Success,' Debuts June 15
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
NeuroImage: Multiplexing in the visual brain 
(Date:6/25/2016)... ... June 25, 2016 , ... On Friday, June 10, Van Mitchell, Secretary ... Work award to iHire in recognition of their exemplary accomplishments in worksite health promotion. ... Maryland Workplace Health & Wellness Symposium at the BWI Marriott in Linthicum Heights. iHire ...
(Date:6/24/2016)... , ... June 24, 2016 , ... June 19, 2016 ... dangers associated with chronic pain and the benefits of holistic treatments, Serenity Recovery ... are suffering with Sickle Cell Disease. , Sickle Cell Disease (SCD) is a disorder ...
(Date:6/24/2016)... ... June 24, 2016 , ... Dr. Amanda Cheng, ... treatment. Dr. Cheng has extensive experience with all areas of orthodontics, including robotic ... osteogenic orthodontics. , Micro-osteoperforation is a revolutionary adjunct to orthodontic treatment. It ...
(Date:6/24/2016)... ... June 24, 2016 , ... EB Medicine presented its first-ever ... Medicine conference in Ponte Vedra Beach, FL. The awards honor the outstanding work ... Practice and Pediatric Emergency Medicine Practice. , “With this award, we recognize ...
(Date:6/24/2016)... , ... June 24, 2016 , ... National recruitment firm ... life sciences executive with extensive sequencing and genomics experience, as Vice President of North ... Ms. Hill will be responsible for leading the sales team in the commercialization of ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... 2016 Bracket , a leading clinical trial ... clinical outcomes platform, Bracket eCOA (SM) 6.0, at the ... – 30, 2016 in Philadelphia , Pennsylvania.  ... Assessment product of its kind to fully integrate with RTSM, ... eCOA 6.0 is a flexible platform for electronic clinical outcomes ...
(Date:6/23/2016)... and INDIANAPOLIS , June 23, ... a Lilly Diabetes Tomorrow,s Leaders Scholarship is any indication, ... winners, announced today online at www.diabetesscholars.org by ... 1 diabetes stand in the way of academic and ... the Foundation,s scholarship program since 2012, and continues to ...
(Date:6/23/2016)... , June 23, 2016 ... Oticon , industry leaders in advanced ... launch of Oticon Opn ™, the world,s first ... of possibilities for IoT devices.      (Photo: ... Oticon introduces a number of ,world firsts,: ...
Breaking Medicine Technology: