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Scans Reveal Learning "Sculpts” the Brain's Connections

By MedImaging International staff writers
Posted on 03 Nov 2009
Spontaneous brain activity previously thought to be "white noise,” measurably changes after a person learns a new task, researchers have shown.

The scientists, from Washington University School of Medicine in St. Louis (MO, USA) and the University of Chieti (Italy), also reported that the level of change reflects how well subjects have learned to perform the task. Their study is published online October 5, 2009, in the Proceedings of the [U.S.] National Academy of Sciences (PNAS).

"Recent studies have shown that in the absence of any overt behavior, and even during sleep or anesthesia, the brain's spontaneous activity is not random, but organized in patterns of correlated activity that occur in anatomically and functionally connected regions,” said senior author Maurizio Corbetta, M.D., a professor of neurology at University of Chieti. "The reasons behind the spontaneous activity patterns remain mysterious, but we have now shown that learning causes small changes in those patterns, and that these changes are behaviorally important.”

At the beginning of the experiment, Dr. Corbetta, graduate students Chris Lewis and Antonello Baldassarre, and their colleagues in Italy used functional connectivity magnetic resonance imaging (MRI) to scan the spontaneous brain activity of 14 volunteers as they sat quietly. Next, researchers scanned the subjects as they spent one to two hours a day for five to seven days learning to watch a display inside the MRI scanner for the brief presence of an inverted "T” in a specific part of the screen. Two sets of brain regions were particularly active during the task: part of the visual cortex that corresponded to the portion of the visual field where subjects were looking for the "T,” and areas in the dorsal part of the brain involved in directing attention to the location on the screen.

After the visual training, scientists again scanned the party participants' brains while they did nothing. When the subjects rested at the start of the experiment, spontaneous activity in the two parts of the brain that are important to the visual task was either not linked or weakly correlated, with the two regions involved in the upcoming task only occasionally being active at the same time. After learning, although, each region was more likely to be active when the other region was not. Subjects who were more successful at the task showed a higher degree of this "anticorrelation” between the two regions after learning.

Dr. Corbetta suggests this learning-induced change in the brain's spontaneous activity may reflect what he calls a "memory trace” for the new skill. The trace makes it easier to use those areas of the brain together again when the same challenge recurs. "It's as though these two brain systems are learning to get out of each other's way,” said Dr. Corbetta. "After learning, the brain can identify the targets at a glance in a way that requires less direct attention and thus less interaction between the regions involved in the task.”

In addition to helping "grease” anatomic connections between different brain regions, Dr. Corbetta hypothesized that the changes in spontaneous brain activity may maintain a record of earlier experience that constrains the way the same circuitries are recruited at the time of a task. "This suggests that disruption of spontaneous correlated activity may be a common mechanism through which brain function abnormalities manifest in a number of neurological, psychiatric, or developmental conditions,” he concluded.

Related Links:
Washington University School of Medicine in St. Louis
University of Chieti

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91 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (72.956085205078): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (90.122222900391): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
105 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
106 (67.949295043945): 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=294726233 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (66.041946411133): 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=294726233 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (69.856643676758): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
109 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
110 (45.061111450195): 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=294726233 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (480.17501831055): 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=294726233 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (517.84515380859): 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 (353.09791564941): 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 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
115 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
116 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
117 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
118 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
119 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
120 (58.174133300781): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
121 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
122 (256.06155395508): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 35190.105438232): 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 (!!!!! 1847.0287322998): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294726233 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294726233 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 22485.017776489): ( 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 (55.074691772461): ( 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 (344.99168395996): 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 (36.954879760742): 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 (265.12145996094): 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 (54.836273193359): 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 (300.16899108887): 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 (41.007995605469): 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 (236.98806762695): 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 (35.04753112793): 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 (453.94897460938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (334.02442932129): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (223.15979003906): SELECT name FROM jos_deeppockets WHERE id=212
138 (35.04753112793): SELECT name FROM jos_deeppockets WHERE id=212
139 (558.85314941406): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (458.95576477051): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (118.97087097168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
142 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
143 (!!!!! 10102.987289429): TRUNCATE TABLE jos_trademed_module
144 (127.07710266113): 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=294726233 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (61.03515625): 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=294726233 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (864.02893066406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (74.863433837891): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (100.13580322266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
149 (48.160552978516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
150 (!!!!! 1174.2115020752): 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 (69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
152 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
153 (39.100646972656): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294726233 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294726233 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (29.087066650391): 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 (26.941299438477): 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 (26.941299438477): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
158 (59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294726233 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294726233 AND published='1' LIMIT 1
159 (108.00361633301): select jos_twitters.link from jos_twitters where cat=10
160 (26.941299438477): select jos_facebook.link from jos_facebook where cat=10
161 (27.894973754883): select jos_google_plus.link from jos_google_plus where cat=10
162 (25.98762512207): select jos_linkedin.link from jos_linkedin where cat=10
163 (264.88304138184): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (938.89236450195): insert into jos_banners_delta values (14615,'2025-06-29 03:27:24','216.73.216.249','view'),(14202,'2025-06-29 03:27:24','216.73.216.249','view'),(14203,'2025-06-29 03:27:24','216.73.216.249','view')