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Brain Scans Show Distinctive Patterns in Generalized Anxiety Disorder Patients

By MedImaging International staff writers
Posted on 14 Jan 2010
Scrambled connections between the region of the brain that processes fear and emotion and other brain regions could be the hallmark of a common anxiety disorder, according to a new study. The findings could help researchers identify biologic differences between types of anxiety disorders as well as such disorders as depression.

The study, which was published December 7, 2009, in the journal Archives of General Psychiatry, studied the brains of people with generalized anxiety disorder (GAD), a psychiatric disorder in which patients spend their days in a haze of worry over everyday concerns. Researchers have known that the amygdala, a couple of almond-sized bundles of nerve fibers in the middle of the brain that help process emotion, memory, and fear, are involved in anxiety conditions such as GAD. However, this study is the first to look close enough to detect neural pathways going to and from subsections of this tiny brain region.

Such small-scale observations are important for understanding the brains of people with psychiatric disorders, said Duke University (Durham, NC, USA) neuroscientist Kevin LaBar, Ph.D., who was not involved in the research. "If we want to distinguish GAD from other anxiety disorders, we might have to look at these subregions instead of the general signal from this area,” he said. "It's methodologically really impressive.”

To get close enough to discern one region of the amygdala from another, Stanford University School of Medicine (Stanford, CA, USA) psychiatry resident Amit Etkin, MD, PhD, and his colleagues focused on regions of interest defined by detailed anatomic studies of human brains. They recruited 16 people with GAD and 17 psychologically healthy participants and scanned their brains using functional magnetic resonance imaging (fMRI), which measures blood-flow fluctuations caused by changes in activity in different regions of the brain. Each person spent eight minutes in the fMRI scanner, letting his or her mind wander.

The researchers analyzed the resulting data to determine which areas were connected--that is, which regions were likely to activate in tandem. They first looked at one subregion, the basolateral amygdala, which is situated at the base of the amygdala. In healthy participants, they found that the subregion was linked to the occipital lobe at the back of the brain, the temporal lobes beneath the ears and the prefrontal cortex just behind the forehead. These regions are associated with visual and auditory processing, as well as with memory and high-level emotional and cognitive functions.

The other subregion, known as the centromedial amygdala, found at the top of the amygdala, was associated with subcortical, or deeper, areas of the brain. These connections included the thalamus, which controls information flow throughout the brain and helps regulate alertness from its perch in the midbrain; the brain stem, which regulates heart rate, breathing, and release of neurotransmitters such as serotonin and dopamine; and the densely wrinkled cerebellum, which sits behind the brain stem and controls motor coordination. The associations confirmed what anatomic studies in animals have found, according to Dr. Etkin, the lead author of the study. The team also analyzed resting fMRI data from 31 more healthy people and found similar results.

But in people with GAD, the scans revealed another pattern. The two regions still sent emissaries to their separate targets, but the lines of communication were muddled. "The basolateral amygdala was less connected with all of its targets and more connected with centromedial targets,” Dr. Etkin said. "And the centromedial was less connected with its normal targets and more connected with the basolateral targets.”

The investigators also found that both amygdala regions had less connectivity to the region of the brain responsible for determining the importance of stimuli. This could mean that individuals with the disorder have a more difficult time perceiving truly worrisome situations from mild annoyances. At the same time, the amygdala was more connected to a cortical executive-control network previously found to exert cognitive control over emotion.

The cognitive control connection might explain why GAD is characterized by obsessive worry, according to Dr. Etkin. Individuals with the disorder feel overwhelmed by emotion and do not believe they can feel sad or upset without coming completely undone. Therefore, in an attempt to avoid facing their unpleasant feelings, they distract themselves by worrying. Such overthinking may work in the short term but becomes problematic over time.

Researchers cannot be sure whether the connectivity abnormalities came first or whether excessive worrying shaped the brain by reinforcing specific neural pathways. Still, the patterns uncovered by neurologic scans could one day help psychiatrists diagnose and treat the disease. "This is a nice example of neurology and psychiatry joining forces,” said Michael Greicius, M.D., assistant professor of neurology and neurological sciences at Stanford and senior author of the article.

The next phase of the research, reported Dr. Etkin, is to study patients with other anxiety disorders and with depression. That will allow researchers to see if patterns of amygdala connectivity differ between disorders. If they do, brain scans could one day become additional diagnostic tools for disorders with symptoms that often overlap.

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84 (32.186508178711): SELECT show_live FROM jos_com_show_setting LIMIT 1
85 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (51.021575927734): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727381 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (60.081481933594): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727381 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (38.14697265625): 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 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
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 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (34.809112548828): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (26.941299438477): 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 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
105 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
106 (48.87580871582): 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=294727381 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (46.014785766602): 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=294727381 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (92.983245849609): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
109 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
110 (49.114227294922): 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=294727381 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (461.10153198242): 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=294727381 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (686.1686706543): 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 (554.80003356934): 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 (168.80035400391): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
115 (74.863433837891): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
116 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
117 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
118 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
119 (44.822692871094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
120 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
121 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
122 (432.96813964844): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 26951.07460022): 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 (725.03089904785): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727381 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727381 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 9356.0218811035): ( 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 (70.095062255859): ( 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 (283.95652770996): 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 (38.14697265625): 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 (267.02880859375): 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 (81.062316894531): 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 (201.94053649902): 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 (33.140182495117): 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 (232.93495178223): 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 (435.11390686035): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (322.10350036621): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (216.00723266602): SELECT name FROM jos_deeppockets WHERE id=212
138 (32.901763916016): SELECT name FROM jos_deeppockets WHERE id=212
139 (525.95138549805): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (436.06758117676): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
142 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
143 (!!!!! 10905.027389526): TRUNCATE TABLE jos_trademed_module
144 (126.83868408203): 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=294727381 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (83.92333984375): 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=294727381 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (648.02169799805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (74.148178100586): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (74.148178100586): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
149 (59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
150 (!!!!! 1425.9815216064): 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 (102.04315185547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
152 (70.810317993164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
153 (47.922134399414): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727381 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727381 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (86.069107055664): 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 (43.153762817383): 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 (56.982040405273): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (169.03877258301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
158 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727381 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727381 AND published='1' LIMIT 1
159 (87.02278137207): select jos_twitters.link from jos_twitters where cat=10
160 (31.948089599609): select jos_facebook.link from jos_facebook where cat=10
161 (31.948089599609): select jos_google_plus.link from jos_google_plus where cat=10
162 (32.186508178711): select jos_linkedin.link from jos_linkedin where cat=10
163 (271.08192443848): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1171.1120605469): insert into jos_banners_delta values (14615,'2025-06-28 20:10:19','216.73.216.249','view'),(14202,'2025-06-28 20:10:19','216.73.216.249','view'),(14203,'2025-06-28 20:10:19','216.73.216.249','view')