2009年10月30日

The seat of literacy

Studing the changes that take place in the brain when we learn to read and write is very difficult as literacy is usually achieved during childhood, when many other developmental changes occur.

An opportunity to use brain imaging to study the process arose when a group of former guerrillas in Colombia, including some who had not been taught to read as children, were reintegrated
into Colombian society.

Comparing brain architecture of 'late literates' to their illiterate compatriots highlighted a number of brain areas potentially involved in the acquisition of literacy.

Interconnections between the left and right anglular gyri in the parietal lobe emerge as important for reading irrespective of age of reading acquisition and ability.


### DataBace ###
nature Vol.461 837-1018 Issue no.7266 15 Octiber 2009
Letter p.983 / An anatomical signature for literacy / M Carreiras te al.
Abstractions p.846 / First Author

posted by 0≠素子 at 19:56| Comment(1) | brain | このブログの読者になる | 更新情報をチェックする

2009年10月26日

Place cells know their place

As we move around, spatial information is encoded and processed by 'place' cells in the hippocampus.

Each of these neurons increases its firing rate when situated in its 'place', thus equating rate coding with location.

The firing patterns of hippocampal place cells have been studied extensively over the past 40 years and theoretical models have been proposed to explain the mechanisms responsible for encoding place and time in newral circuits.

Now the development of techniques allowing intracellular recording from place cells in awake, behaving mice navigating a virtual reality maze makes it possible to test these models.

Initial results point to the existence of two subthreshold signatures of place fields : an incrase in the amplitude of membrane potential oscillations at theta frequencies and a ramp - like depolarization of baseline membrane potential.


### DataBace ###
nature Vol.461 439-558 Issue no.7263 24 September 2009
Article p.941 / Intracellular dynamics of hippocampal place cells during virtual navigation / C D Harvey et al. (Princeton University)
News and Views p.889 / Neuro Science : The insaide story on place cells / Douglas Nitz


see
posted by 0≠素子 at 18:39| Comment(0) | brain | このブログの読者になる | 更新情報をチェックする
×

この広告は1年以上新しい記事の投稿がないブログに表示されております。