You are currently browsing the thoughts on thoughts weblog archives for the day 16/01/2011.
M | T | W | T | F | S | S |
---|---|---|---|---|---|---|
« Dec | Feb » | |||||
1 | 2 | |||||
3 | 4 | 5 | 6 | 7 | 8 | 9 |
10 | 11 | 12 | 13 | 14 | 15 | 16 |
17 | 18 | 19 | 20 | 21 | 22 | 23 |
24 | 25 | 26 | 27 | 28 | 29 | 30 |
31 |
- 22/04/2011: fresh look at mirror neurons
- 19/04/2011: What change blindness says about memory
- 16/04/2011: Synaesthesia of concepts
- 13/04/2011: synaesthesis reversed by hypnosis
- 10/04/2011: How is the world represented without vision?
- 07/04/2011: keeping attention on the danger
- 04/04/2011: Faces
- 01/04/2011: consciousness evolved
- 29/03/2011: Anticipating eye movements
- 27/03/2011: Encephalon #85
- April 2011
- March 2011
- February 2011
- January 2011
- December 2010
- November 2010
- October 2010
- September 2010
- August 2010
- July 2010
- June 2010
- May 2010
- April 2010
- March 2010
- February 2010
- January 2010
- December 2009
- November 2009
- October 2009
- September 2009
- August 2009
- July 2009
- June 2009
- May 2009
- April 2009
- March 2009
- February 2009
- January 2009
- December 2008
- November 2008
- October 2008
- September 2008
- August 2008
- July 2008
- June 2008
Archive for 16/01/2011
Faster scan
16/01/2011 by admin.
For humans (as opposed to animals) there are at present very few ways to look at the brain. Researchers can look at the electrical fields on the outside of the skull (EEG). This give clear ‘whens’ for events but poor ‘wheres’. Looking at blood flow in the brain (fMRI) gives better ‘wheres’ but poorer ‘whens’. Anatomy in autopsy can be compared to behaviour during life in individuals with trauma, surgery or congenital damage to part of the brain, but there is little control as each case is individual. Occasionally electrodes are placed in the brain in preparation for brain surgery and patients permit investigation of the neurons in the region of the electrodes. The effects of deep brain stimulation is another source of data. These last two paths are also somewhat one-off with limited duplication or control. Various chemicals can affect the brain and behaviour but here the ‘wheres’ and ‘whens’ are very poor. All and all it is a meager experimental toolkit.
So it is great news that fMRI setups can have a pair of modifications that together increase the speed by over seven times. Shorter duration scans will give much better ‘when’ definition. The Connectome Project will benefit as well as the usual ‘coloured patches in the brain’ type research.
Posted in Uncategorized | 2 Comments »