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Brain Regions Synchronize Activity to Enable Attention

By MedImaging International staff writers
Posted on 28 Jan 2014
New imaging findings have revealed that the brain appears to synchronize the activity of different brain areas to make it possible for an individual to concentrate on a specific task.

Researchers think the process, similar to tuning various walkie-talkies to the same frequency, may help establish strong channels for communication between brain areas that detect sensory stimuli. “We think the brain not only puts regions that facilitate attention on alert but also makes sure those regions have open lines for calling each other,” said first author Amy Daitch, a graduate student researcher from the Washington University School of Medicine in St. Louis (MO, USA).

The study’s findings were published ahead of print November 11, 2013, in the Proceedings of the National Academy of Sciences of the United States of America (PNAS). People who suffer from brain injuries or strokes frequently have difficulties paying attention and concentrating. “Attention deficits in brain injury have been thought of as a loss of the resources needed to concentrate on a task,” said senior author Maurizio Corbetta, MD, a professor of neurology. “However, this study shows that temporal alignment of responses in different brain areas is also a very important mechanism that contributes to attention and could be impaired by brain injury.”

Attention lets people disregard extraneous sensory stimuli, similar to a driver disregarding a ringing cell phone, and pay attention to important stimuli, like stepping onto the road in front of the car. To examine brain alterations linked to attention, the scientists employed grids of electrodes temporarily implanted onto the brains of patients with epilepsy. Co-senior author Eric Leuthardt, MD, associate professor of neurosurgery and bioengineering, uses the grids to map for surgical removal of brain tissues that contribute to uncontrollable seizures.

With patient permission, the grids also can allow Dr. Leuthardt’s lab to study human brain activity with a degree of detail unavailable with any other technology. Typically, Dr. Corbetta and his colleagues research attention using various forms of magnetic resonance imaging (MRI), which can identify changes in brain activity that occur every 2 to 3 seconds. However, with the grids in position, Drs. Corbetta and Leuthardt can study the changes that occur in milliseconds.

The scientists scanned the brains of seven epilepsy patients before grid implantation, using MRI to map regions known to contribute to attention. With the grids in position, the investigators monitored brain cells as the patients watched for visual targets, directing their attention to different locations on a computer screen without moving their eyes. When patients saw the targets, they pressed a button to let the scientists know they had seen them.

“We analyzed brain oscillations that reflect fluctuations in excitability of a local brain region; in other words, how difficult or easy it is for a neuron to respond to an input,” Ms. Daitch said. “If areas of the brain involved in detecting a stimulus are at maximum excitability, you would be much more likely to notice the stimulus.”

Excitability typically increases and falls in the cells that comprise a specific brain region. But these oscillations normally are not aligned between different brain regions. The findings revealed that as patients directed their attention, the brain regions most important for paying attention to visual stimuli modified their excitability cycles, causing them to start hitting the peaks of their cycles at the same time. The excitability cycles did not vary in regions not involved in attention. “If the cycles of two brain regions are out of alignment, the chances that a signal from one region will get through to another region are reduced,” Dr. Corbetta said.

The scientists are now trying to determine whether knowing not just the location, but additionally the rhythm of the task, allows participants to bring the excitability of their brain regions into alignment more rapidly.

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Washington University School of Medicine in St. Louis


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88 (30.994415283203): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294750426 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (31.948089599609): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
90 (!!!!! 7282.018661499): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (86.069107055664): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
105 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
106 (51.021575927734): 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=294750426 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (481.84394836426): 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=294750426 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (144.95849609375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
109 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
110 (!!!!! 4110.0978851318): 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=294750426 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 3782.0339202881): 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=294750426 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (744.10438537598): 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 (396.0132598877): 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 (785.11238098145): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
115 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
116 (447.03483581543): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
117 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
118 (526.18980407715): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
119 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
120 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
121 (39.815902709961): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
122 (385.99967956543): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 52028.894424438): 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 (813.00735473633): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294750426 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294750426 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 20853.996276855): ( 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 (74.148178100586): ( 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 (132.79914855957): 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 (33.855438232422): 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 (571.01249694824): 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 (36.954879760742): 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 (396.0132598877): 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 (38.14697265625): 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 (32.901763916016): 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 (30.994415283203): 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 (!!!!! 1052.8564453125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (664.94941711426): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (879.04930114746): SELECT name FROM jos_deeppockets WHERE id=212
138 (48.87580871582): SELECT name FROM jos_deeppockets WHERE id=212
139 (!!!!! 1201.868057251): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (723.83880615234): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 4249.8111724854): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
142 (96.08268737793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
143 (!!!!! 17515.897750854): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 1229.0477752686): 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=294750426 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (288.00964355469): 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=294750426 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (860.92948913574): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (199.79476928711): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (950.09803771973): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
149 (180.00602722168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
150 (!!!!! 2866.0297393799): 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 (!!!!! 1739.0251159668): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
152 (201.94053649902): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
153 (66.995620727539): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294750426 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294750426 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (41.961669921875): 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 (40.054321289062): 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 (180.95970153809): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 1590.0135040283): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
158 (184.05914306641): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294750426 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294750426 AND published='1' LIMIT 1
159 (41.007995605469): select jos_twitters.link from jos_twitters where cat=10
160 (121.11663818359): select jos_facebook.link from jos_facebook where cat=10
161 (557.89947509766): select jos_google_plus.link from jos_google_plus where cat=10
162 (312.80517578125): select jos_linkedin.link from jos_linkedin where cat=10
163 (486.85073852539): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1069.0689086914): insert into jos_banners_delta values (14615,'2025-06-24 10:45:21','216.73.216.120','view'),(14202,'2025-06-24 10:45:21','216.73.216.120','view'),(14203,'2025-06-24 10:45:21','216.73.216.120','view')