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DTI-MR Brain Imaging Maps Provide Clues into Mental Decline

By MedImaging International staff writers
Posted on 21 Feb 2011
Image: Through Diffusion Tensor Imaging (DTI), a type of neuroimaging that builds on MRI technology, doctors can monitor the health of the brain's white matter (Photo courtesy of scienceNOW).
Image: Through Diffusion Tensor Imaging (DTI), a type of neuroimaging that builds on MRI technology, doctors can monitor the health of the brain's white matter (Photo courtesy of scienceNOW).
The human brain performs as a highly interconnected small-world network, not as a collection of distinct regions as previously thought, with significant implications for why many of who experience cognitive declines in old age. Australian researchers have mapped the brain's neural networks and for the first time correlated them with specific cognitive functions, such as data processing and language.

The study's findings were published in the January 2011 issue of the Journal of Neuroscience. The researchers, from the University of New South Wales (UNSW; Sydney, Australia), are now examining what factors may influence the efficiency of these networks in the hope they can be manipulated to reduce age-related decline. "While particular brain regions are important for specific functions, the capacity of information flow within and between regions is also crucial,” said study leader Prof. Perminder Sachdev, from UNSW's School of Psychiatry. "We all know what happens when road or phone networks get clogged or interrupted. It's much the same in the brain. With age, the brain network deteriorates and this leads to slowing of the speed of information processing, which has the potential to impact on other cognitive functions.”

The development of new MRI technology and increased computational power had allowed the development of the neural maps, resulting in a paradigm shift in the way scientists view the brain, according to Prof. Sachdev said. "In the past when people looked at the brain they focused on the gray matter in specific regions because they thought that was where the activity was. White matter was the poor cousin. But white matter is what connects one brain region to another and without the connections grey matter is useless,” he said.

In the study, the researchers performed magnetic resonance imaging (MRI) scans on 342 healthy individuals aged 72 to 92, using a new imaging technique called diffusion tensor imaging (DTI). Using a mathematical technique called graph theory, they plotted and measured the properties of the neural connectivity they observed. "We found that the efficiency of the whole brain network of cortical fiber connections had an influence on processing speed, visuospatial function--the ability to navigate in space--and executive function,” said study first author Dr. Wei Wen. "In particular greater processing speed was significantly correlated with better connectivity of nearly all the cortical regions of the brain.”

Prof. Sachdev reported that the findings help clarify how cognitive functions are organized in the brain, and the more highly distributed nature of some functions over others. "We are now examining the factors that affect age-related changes in brain network efficiency--whether they are genetic or environmental--with the hope that we can influence them to reduce age-related decline,” Prof. Sachdev stated. "We know the brain is not immutable; that if we work on the plasticity in these networks we may be able to improve the efficiency of the connections and therefore cognitive functions.”

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92 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (62.942504882812): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (61.988830566406): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (34.809112548828): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (44.107437133789): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (113.01040649414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
105 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
106 (75.101852416992): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294733525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (72.002410888672): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294733525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (87.02278137207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
109 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
110 (77.009201049805): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294733525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (591.99333190918): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294733525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (755.07164001465): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (425.10032653809): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (128.03077697754): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
115 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
116 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
117 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
118 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
119 (48.160552978516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
120 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
121 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
122 (352.14424133301): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 27358.055114746): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (735.04447937012): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294733525 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294733525 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 10895.967483521): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (75.817108154297): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (300.16899108887): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (37.908554077148): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (303.03001403809): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (39.100646972656): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (199.0795135498): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (34.809112548828): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (237.94174194336): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (40.054321289062): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (511.16943359375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (473.0224609375): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (265.12145996094): SELECT name FROM jos_deeppockets WHERE id=212
138 (87.976455688477): SELECT name FROM jos_deeppockets WHERE id=212
139 (793.9338684082): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (729.08401489258): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (110.86463928223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
142 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
143 (!!!!! 11391.878128052): TRUNCATE TABLE jos_trademed_module
144 (330.92498779297): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294733525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (111.81831359863): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294733525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (742.91229248047): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (118.01719665527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (132.79914855957): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
149 (!!!!! 6690.9790039062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
150 (!!!!! 2151.0124206543): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (113.96408081055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
152 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
153 (69.856643676758): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294733525 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294733525 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (44.107437133789): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
155 (42.915344238281): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
156 (49.829483032227): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (210.04676818848): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
158 (85.115432739258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733525 AND published='1' LIMIT 1
159 (83.92333984375): select jos_twitters.link from jos_twitters where cat=10
160 (40.054321289062): select jos_facebook.link from jos_facebook where cat=10
161 (40.054321289062): select jos_google_plus.link from jos_google_plus where cat=10
162 (39.100646972656): select jos_linkedin.link from jos_linkedin where cat=10
163 (856.87637329102): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1612.1864318848): insert into jos_banners_delta values (14615,'2025-06-27 14:53:16','216.73.216.249','view'),(14202,'2025-06-27 14:53:16','216.73.216.249','view'),(14203,'2025-06-27 14:53:16','216.73.216.249','view')