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Neuroimaging Shows Brain Structures Altered with Casual Marijuana Use

By MedImaging International staff writers
Posted on 29 May 2014
Even casual use of marijuana appears to cause substantial structural changes in key brain structures of young adults, a new neuroimaging study has revealed. Researchers found differences between casual users of marijuana and non-users in the size, shape, and structure of brain areas involved with motivation, emotion, and reward.

The researchers, from Massachusetts General Hospital (MGH; Boston, MA, USA) and Northwestern University (Evanston, IL, USA), published their findings April 16, 2014, in the Journal of Neuroscience. “Most studies associating brain abnormalities with marijuana have been conducted in heavy, habitual users, so this is the first to find abnormalities in recreational users,” stated Jodi Gilman, PhD, of the MGH department of psychiatry, lead author of the study. “We also found these abnormalities to be dose dependent—in other words, they were more pronounced in those who used greater amounts of marijuana.” Co-senior authors of the report are Anne Blood, PhD, of the MGH department of psychiatry, and Hans Breiter, MD, from Northwestern University Feinberg School of Medicine.

Earlier research in animals have found that THC (Tetrahydrocannabinol) causes abnormal changes in cell structure within the nucleus accumbens, a brain region known to be involved in reward and addiction. Other research in heavy marijuana users have found alterations in the volume or size of the amygdala, an area of the brain with a role in emotional processing, and in the density of cells within that structure. The current study was designed to explore whether similar abnormalities occurred in young adult recreational users and whether the amount of marijuana used made any difference.

The study enrolled 40 young adults ages 18 to 25, recruited from Boston-area colleges: 20 who used marijuana at least once a week and 20 who did not use the drug. All users participated in psychiatric interviews to ensure they did not meet criteria for dependence, which include factors such as whether marijuana use interfered with their studies, work or other activities and whether they had needed to increase their usage to get the same effects.

Structural MRI scans of participants’ brains, focusing on the amygdala and nucleus accumbens, were conducted at the Martinos Center for Biomedical Imaging at MGH. Findings indicated that all three measures—volume, density, and shape—of both structures were abnormal in marijuana users compared with non-using control participants. Furthermore, how the three structural measures related to each other was changed in marijuana users. All of these alterations were even more pronounced in users who reported using marijuana more frequently during an average week and smoking more marijuana cigarettes on those instances.

“These abnormal structural changes in the amygdala and nucleus accumbens could indicate that the experience with marijuana alters brain organization and may produce changes in function and behavior,” said Dr. Blood. “It also is possible that the brain is adapting to marijuana exposure and that these new connections may encourage further marijuana use.”

Dr. Breiter, who is also corresponding author of the report, added, “These two brain regions have been broadly implicated in processes underlying addiction, so it’s a real problem that people claiming their marijuana use does not negatively impact their lives show significant changes in these structures. Our findings, which need to be followed up with longer-terms studies, raise serious concerns about efforts to legalize recreational marijuana use, particularly for young adults.”

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91 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
105 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
106 (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 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=294752723 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (47.922134399414): 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=294752723 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
109 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
110 (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 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=294752723 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (493.04962158203): 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=294752723 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (554.08477783203): 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 (378.84712219238): 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 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
115 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
116 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
117 (36.001205444336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
118 (42.200088500977): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
119 (36.954879760742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
120 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
121 (87.02278137207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
122 (246.04797363281): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 19806.146621704): 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 (521.89826965332): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294752723 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294752723 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 7192.1348571777): ( 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 (95.844268798828): ( 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 (335.9317779541): 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 (85.115432739258): 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 (223.87504577637): 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 (35.04753112793): 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 (204.08630371094): 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 (37.908554077148): 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 (250.10108947754): 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 (86.069107055664): 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 (237.94174194336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (233.88862609863): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (128.03077697754): SELECT name FROM jos_deeppockets WHERE id=212
138 (31.948089599609): SELECT name FROM jos_deeppockets WHERE id=212
139 (509.02366638184): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (428.91502380371): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (128.98445129395): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
142 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
143 (!!!!! 6883.8596343994): TRUNCATE TABLE jos_trademed_module
144 (102.99682617188): 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=294752723 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (56.028366088867): 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=294752723 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (784.87396240234): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
149 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
150 (!!!!! 1235.9619140625): 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 (106.0962677002): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
152 (48.160552978516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
153 (32.901763916016): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294752723 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294752723 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (28.848648071289): 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 (30.040740966797): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
158 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752723 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752723 AND published='1' LIMIT 1
159 (256.06155395508): select jos_twitters.link from jos_twitters where cat=10
160 (29.087066650391): select jos_facebook.link from jos_facebook where cat=10
161 (26.941299438477): select jos_google_plus.link from jos_google_plus where cat=10
162 (27.179718017578): select jos_linkedin.link from jos_linkedin where cat=10
163 (283.95652770996): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (911.95106506348): insert into jos_banners_delta values (14615,'2025-06-24 04:35:05','216.73.216.120','view'),(14202,'2025-06-24 04:35:05','216.73.216.120','view'),(14203,'2025-06-24 04:35:05','216.73.216.120','view')