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Recent News and Articles on the Keywords: critical period + experience during + brain  Related to the article below (Last Update: 5/13/2008)

No pole too far if mood takes
The Australian, Australia - May 9, 2008
But the young neuroscientist became interested a few years ago when he noticed similarities between "bipolar", as he calls it, and developmental brain ...
FDA Approves Strattera(R) for Maintenance of ADHD in Children and ...
FOXBusiness - May 8, 2008
There were no significant differences in standardized height change between groups during the post-randomization period. ADHD is the most common psychiatric ...LLY
Hormones, the Brain, and Me
RedOrbit, TX - May 6, 2008
There is now evidence from several levels of analysis to support the critical period hypothesis. Findings from basic neuroscience have recently demonstrated ...
Finding the right preschool for your child isn?t nearly as easy as ...
Egypt Today, Egypt - May 9, 2008
Their imagination peaks during this period and plays an important role in development. El-Abd adds that socialization is an invaluable skill developed ...
Where culture and biology meet
Ha'aretz, Israel - Apr 24, 2008
During this period, human beings became accustomed to a new, dynamic balance of chemicals, which are released in the body following shifts in emotion and ...
Effect of Preemptive Epidural Analgesia on Cytokine Response and ...
RedOrbit, TX - May 9, 2008
Hemodynamic changes during surgery. During 60-minute period after anesthesia, blood pressures in the control group were significantly higher than in the ...
Recognizing the signs
News-Herald.com, OH - May 9, 2008
... users to don some high-tech headgear to experience the "reality" that someone with a serious brain disorder might face during a delusional period. ...
Twin Fates: Sharing the womb with a brother may influence a girl's ...
Science News - Apr 25, 2008
There are probably critical periods of development during which, if androgen levels are high, things end up being masculinized.? Such caveats, of course, ...
A Transition to Depression?
ADVANCE, PA - Apr 14, 2008
Collaborate with a mental health professional when working with women who experience depression during perimenopause or menopause. ...

FinalCall.com
Supreme Planning In Business (Part III)
FinalCall.com, IL - Apr 29, 2008
In order for words to be spoken in normal conversation, it has to leave one part of the brain and get to another part of the brain, and it does it by way of ...
Source: Google News

The Role of Visual Experience in the Development of Columns in Cat Visual Cortex -
MC Crair, DC Gillespie, MP Stryker - Science, 1998 - sciencemag.org
... Many investigations of the role of experience in the development of the ... and where
rapid plasticity can easily be induced during a critical period in early ...

… potentiation and experience-dependent synaptic plasticity in visual cortex by age and experience -
A Kirkwood, HK Lee, MF Bear - Nature, 1995 - nature.com
... cortex requires simultaneous input from both eyes during a postnatal critical period
9-12 ... To explore the role of LTP in this experience-dependent maturation ...

[PDF] Characterization of a novel protein regulated during the critical period for song learning in the … -
JM George, H Jin, WS Woods, DF Clayton - Neuron, 1995 - actxdownload.neuron.org
... In many spe- cies, the experience of hearing ... individual's own vocal behavior only
during a narrow window in juvenile development, a critical period for song ...
-

Can Adverse Neonatal Experiences Alter Brain Development and Subsequent Behavior? -
B Neonate - Logo, 2000 - content.karger.com
... often permanent effects of early sensory experiences on the ... 6?9 days of age, a period
that corresponds ... We postulate that a critical window of neonatal brain ...

… , the neurobiology of adaptation, and ?use-dependent? development of the brain: How ?states? become … -
BD Perry, RA Pollard, TL Blakley, WL Baker, D … - Infant Mental Health Journal, 1995 - doi.wiley.com
... a critical period - exists during which specific sensory experience was required
for optimal organization and development of the part of the brain mediating a ...

Experience and brain development -
WT Greenough, JE Black, CS Wallace - Child Development, 1987 - JSTOR
... of synapses in kitten visual cortex during visual depriva ... The effect of visual
experience on tubulin synthesis dur- ing a critical period of visual ...

Brain Gene Expression During REM Sleep Depends on Prior Waking Experience -
S Ribeiro, V Goyal, CV Mello, C Pavlides - Learning & Memory, 1999 - Cold Spring Harbor Lab
... visual cortex during and after the critical period: Differences between EGR ... firing
sequences in rat hippocampus during sleep following spatial experience. ...

Reactivation of Ocular Dominance Plasticity in the Adult Visual Cortex -
T Pizzorusso, P Medini, N Berardi, S Chierzi, JW … - Science, 2002 - sciencemag.org
... 3 Cambridge University Centre for Brain Repair, Robinson ... circuits are sensitive to
experience during well-defined ... 1). After the critical period, plasticity is ...

[PDF] … gene transcription in neocortical neuronal plasticity during the developmental critical period -
TA Pham, S Impey, DR Storm, MP Stryker - Neuron, 1999 - keck.ucsf.edu
... end of the critical period. ... ronal circuits within the brain are modified by
experience ... throughout the life of the organism, it is during early ...
-

BDNF regulates the maturation of inhibition and the critical period of plasticity in mouse visual … -
ZJ Huang, A Kirkwood, T Pizzorusso, V Porciatti, B … - Cell, 1999 - cell.com
... cortex is influenced by visual experience during an early ... that regulate such a critical
period remain unclear. ... the postnatal rise of brain-derived neurotrophic ...

Source: Google Scholar

Brain Altered During Critical Period By Smell Experience

Unlike the circuitry of the visual system, that of the olfactory system was thought to be hardwired: Once the neurons had formed, no amount of sensory input could change their arrangement. Now researchers at Rockefeller University and their collaborators have upturned this scientific dogma by showing that there is a sensitive period during which the external environment can alter a circuit in the fly brain that detects carbon dioxide, a gas that alerts flies to food and mates. This research, to be published in the December 6 issue of Neuron, may suggest that this brain plasticity isn't limited to the carbon dioxide detection circuit. Rather, it may be a general feature of the olfactory system itself.

"The circuit has a genetic plan, but that genetic plan can adjust to real world conditions," says Leslie Vosshall, head of the Laboratory of Neurogenetics and Behavior. "This paper is the first compelling case that the olfactory system is plastic."
Using several imaging techniques, Vosshall and her colleagues traced the carbon dioxide circuit, a well-described pathway that consists of three different types of neurons, the axons and dendrites of which form an entangled ball called a glomerulus. The researchers exposed flies to elevated levels of carbon dioxide to see whether it would alter the shape of this circuit or how it functioned. The glomerulus's volume was already increased after two days of exposure (from birth) and kept on increasing for five days, at which point it stopped. The increase in this specific glomerulus could only be induced by elevated levels of carbon dioxide and was also reversible.

After those initial few days, however, the researchers saw a different story unfold. If they didn't expose the flies to carbon dioxide within the first five days, genetics locked in the glomerulus's size such that no matter how long the flies were exposed to the gas, the glomerulus's volume didn't increase. These findings suggest that the fly's external environment can rewire the carbon dioxide detection circuit only during a five-day window of development.

"During this critical period, the olfactory system is flexible enough to calibrate its genetic map to its local environment," says first author Silke Sachse, a former postdoc in the Vosshall lab who is now a group leader in optical imaging at the Max Planck Institute for Chemical Ecology in Jena, Germany. "But once that window closes, the circuit is no longer plastic."

To figure out the mechanism by which the glomerulus increases its volume, the Vosshall group imaged the three types of neurons that make up the glomerulus -- olfactory sensory neurons, projection neurons and interneurons -- to see whether their structure or function had changed. The olfactory sensory neurons, which report sensory information to glomeruli, did not show any sign of structural or functional changes. However, the projection neurons, which send information from the glomeruli to the brain, and the interneurons, which communicate with the two types of neurons as well as the glomeruli, showed significant functional changes. "Usually the sensory neurons collect information and send it to the brain and it is the job of the brain to interpret what the information means," says Vosshall. "For plasticity to be useful, it probably makes sense to delegate that job to the brain rather than to the external sensory neurons."

Source: Thania Benios
Rockefeller University
 
 
 
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