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Diffusion MRI Tracks Memories and May Detect Alzheimer's at Early Stage

By MedImaging International staff writers
Posted on 01 Sep 2009
Israeli scientists have developed a new way to monitor the effect of memory on brain structure.

Dr. Yaniv Assaf, from Tel Aviv University's (Israel) department of neurobiology, developed the approach. "With a specific MRI [magnetic resonance imaging] methodology called diffusion imaging MRI, we can investigate the microstructure of the tissue without actually cutting into it,” he explained. "We can measure how much capacity our brain has to change structurally, what our memory reserve is, and where that happens.”

Dr. Assaf's study, presented at the annual meeting of the Human Brain Mapping Organization in San Francisco, CA, USA, in August 2009, has been pivotal to the way scientists view the effect of memory on the brain. Scientists used to believe that the brain took days or weeks to change its microstructure. Dr. Assaf's new observations demonstrate that the microstructure can change in just hours. "It gives us a quantifiable measure of the plasticity of each individual brain,” he said. "It's possible that before a person experiences any memory loss, the plasticity is affected--that is, the ability of one's brain to adapt to change. A lack of ability for change in the brain could mean susceptibility to dementia. Now, we have the means to monitor this ability.”

To track changes in the brain, Dr. Assaf initiated a study that focused on spatial learning and memory. "Usually, scientists distinguish between functional and structural plasticity,” he stated. Functional plasticity refers to neuronal activity in the brain, while structural plasticity refers to the physical shape of the brain itself. "From animal studies we know that spatial memory tasks have consequences for both.”

First, study volunteers were scanned using diffusion MRI. Then, they were asked to play two hours of a racetrack video game, going over the same virtual racetrack 16 times. "This measured a special form of memory--spatial memory,” noted Dr. Assaf. "Each time they circled the track, the time they took to complete it decreased. At the end of the two hours, we put them back into the MRI to see the difference.”

Dr. Assaf and his team saw a noticeable change measured by diffusion MRI in the characteristics of brain microstructure. The memorization of the virtual racetrack affected the hippocampus, motor, and visual areas of the brain. "The most striking thing about this study is that it shows structural plasticity happening in only two hours,” he noted. "This changes what we think structural plasticity is. It shows that memory is rapidly changing the structure of the cells, and that may lead to a lasting effect on the brain.”

According to Dr. Assaf, most of the research on Alzheimer's disease and dementia focuses on its aftereffects. Diffusion MRI, he believes, could be used for early detection of the disorder. "We can study the memory capacity of an individual at high risk for these disorders, and compare it to the morphological plasticity of people who are not at risk,” Dr. Assaf commented. "Such an approach may allow us to develop an intervention at an early stage, possibly in the form of drugs, one that may not be appropriate at a later stage.”

Another similar study, now being conducted in collaboration with Tel Aviv University's Prof. Daniel M. Michaelson, involves working with MRI and animals with mutations of Alzheimer's.

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Tel Aviv University



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90 (82.969665527344): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (60.081481933594): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (57.93571472168): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (68.902969360352): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (92.029571533203): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (42.200088500977): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (68.902969360352): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (104.90417480469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
105 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
106 (86.069107055664): 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=294725237 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (116.10984802246): 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=294725237 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (102.04315185547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
109 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
110 (79.870223999023): 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=294725237 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (655.8895111084): 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=294725237 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (782.96661376953): 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 (586.03286743164): 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 (118.97087097168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
115 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
116 (100.85105895996): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
117 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
118 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
119 (52.213668823242): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
120 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
121 (54.836273193359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
122 (294.92378234863): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 29531.955718994): 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 (617.98095703125): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294725237 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294725237 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 10529.9949646): ( 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 (131.13021850586): ( 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 (103.95050048828): 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 (51.975250244141): 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 (65.088272094727): 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 (46.014785766602): 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 (385.99967956543): 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 (111.81831359863): 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 (50.067901611328): 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 (41.007995605469): 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 (500.91743469238): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (381.9465637207): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (56.982040405273): SELECT name FROM jos_deeppockets WHERE id=212
138 (39.815902709961): SELECT name FROM jos_deeppockets WHERE id=212
139 (932.93190002441): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (776.05247497559): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (108.00361633301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
142 (73.19450378418): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
143 (!!!!! 19956.111907959): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 2364.8738861084): 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=294725237 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (!!!!! 1063.8236999512): 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=294725237 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 1042.8428649902): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (85.830688476562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (474.92980957031): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
149 (238.89541625977): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
150 (!!!!! 1844.1677093506): 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 (111.10305786133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
152 (190.97328186035): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
153 (104.18891906738): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294725237 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294725237 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (51.975250244141): 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 (37.193298339844): 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 (51.975250244141): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (179.05235290527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
158 (102.04315185547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294725237 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294725237 AND published='1' LIMIT 1
159 (69.141387939453): select jos_twitters.link from jos_twitters where cat=10
160 (47.922134399414): select jos_facebook.link from jos_facebook where cat=10
161 (612.97416687012): select jos_google_plus.link from jos_google_plus where cat=10
162 (56.982040405273): select jos_linkedin.link from jos_linkedin where cat=10
163 (425.10032653809): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1140.1176452637): insert into jos_banners_delta values (14615,'2025-06-29 01:15:03','216.73.216.249','view'),(14202,'2025-06-29 01:15:03','216.73.216.249','view'),(14203,'2025-06-29 01:15:03','216.73.216.249','view')