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Short-Term Memory Deciphered with fMRI Technology

By MedImaging International staff writers
Posted on 16 Mar 2009
People voluntarily choose what information they store in short-term memory. Now, using functional magnetic resonance imaging (fMRI) technology, researchers can see just what kind of data people are retaining in memory based only on patterns of activity in the brain.

Psychologists from the University of Oregon (UO; Eugene, USA) and the University of California, San Diego (UCSD; USA) reported the study's findings in the February 2009 issue of Psychological Science. By evaluating blood-flow activity, they were able to identify the specific color or orientation of an object that was intentionally stored by the observer.

The experiments, in which subjects viewed a stimulus for one second and held a specific feature of the object in mind after the stimulus disappeared, were conducted in the UO's Robert and Beverly Lewis Center for Neuroimaging. In 10-second delays after each exposure, researchers recorded brain activity during memory selection and storage processing in the visual cortex, a brain region that they hypothesized would support the maintenance of visual details in short-term memory.

"Another interesting thing was that if subjects were remembering orientation, then that pattern of activity during the delay period had no information about color, even though they were staring at a colored-oriented stimulus,” said Dr. Edward Awh, a UO professor of psychology. "Likewise, if they chose to remember color we were able to decode which color they remembered, but orientation information was completely missing.”

The investigators utilized machine-learning algorithms to examine spatial patterns of activation in the early visual cortex that are associated with remembering different stimuli, said Dr. John T. Serences, professor of psychology at UC-San Diego. "This algorithm,” he said, "can then be used to predict exactly what someone is remembering based on these activation patterns.”

Increases in blood flow, as seen with fMRI, are measured in voxels--small units displayed in a three-dimensional (3D) grid. Different vectors of the grid, corresponding to neurons, respond as the participants view and store their chosen memories. Based on patterns of activity in an individual's visual cortex, located at the rear of the brain, researchers can pinpoint what is being stored and where, according to Dr. Awh.

The study is similar to one published in February 2009 issue of the journal Nature and led by Vanderbilt University (Nashville, TN, USA) neuroscientist Dr. Frank Tong and colleagues, who were able to predict with 80%-plus accuracy which patterns individuals held in memory 11 seconds after seeing a stimulus. "Their paper makes a very similar point to ours,” Dr. Awh said, "though they did not vary which ‘dimension' of the stimulus people chose to remember, and they did not compare the pattern of activity during sensory processing and during memory. They showed that they could look at brain activity to classify which orientation was being stored in memory.”

What Dr. Awh and colleagues found was that the sensory area of the brain had a pattern of activity that represented only an individual's intentionally stored aspect of the stimulus. This voluntary control in memory selection, Dr. Awh reported, compares to earlier research, including that done by Dr. Awh and coauthor Dr. Edward K. Vogel, also from the UO, that there is limited capacity for what can be stored at one time. People choose what is important and relevant to them, according to Dr. Awh.

"Basically, our study shows that information about the precise feature a person is remembering is represented in the visual cortex,” Dr. Serences said, "This is important because it demonstrates that people recruit the same neural machinery during memory as they do when they see a stimulus.” That demonstration, according to Dr. Awh, supports the sensory recruitment theory, which suggests the same areas of the brain are involved in perception of a stimulus and memory storage.

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89 (34.093856811523): 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 (58.174133300781): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (29.802322387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (26.941299438477): 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 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (39.815902709961): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
105 (50.783157348633): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 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=294722400 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (46.968460083008): 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=294722400 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
109 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
110 (46.968460083008): 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=294722400 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (523.09036254883): 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=294722400 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (560.99891662598): 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 (368.11828613281): 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 (100.13580322266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
115 (58.174133300781): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
116 (91.075897216797): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
117 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
118 (144.95849609375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
119 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
120 (59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
121 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
122 (417.94776916504): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 20053.863525391): 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 (645.16067504883): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294722400 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294722400 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 9016.0369873047): ( 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 (77.962875366211): ( 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 (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
128 (39.100646972656): 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 (41.961669921875): 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 (28.848648071289): 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 (319.00405883789): 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 (56.028366088867): 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 (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
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 (571.01249694824): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (719.07043457031): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (270.84350585938): SELECT name FROM jos_deeppockets WHERE id=212
138 (47.206878662109): SELECT name FROM jos_deeppockets WHERE id=212
139 (607.96737670898): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (518.0835723877): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
142 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
143 (!!!!! 8842.945098877): TRUNCATE TABLE jos_trademed_module
144 (130.17654418945): 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=294722400 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (66.995620727539): 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=294722400 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (800.84800720215): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (58.174133300781): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
149 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
150 (!!!!! 1145.1244354248): 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 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
152 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
153 (37.908554077148): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294722400 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294722400 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (36.001205444336): 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 (31.948089599609): 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 (32.901763916016): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
158 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294722400 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294722400 AND published='1' LIMIT 1
159 (41.961669921875): select jos_twitters.link from jos_twitters where cat=10
160 (30.040740966797): select jos_facebook.link from jos_facebook where cat=10
161 (30.994415283203): select jos_google_plus.link from jos_google_plus where cat=10
162 (30.994415283203): select jos_linkedin.link from jos_linkedin where cat=10
163 (281.09550476074): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1090.0497436523): insert into jos_banners_delta values (14615,'2025-06-29 21:33:34','216.73.216.249','view'),(14202,'2025-06-29 21:33:34','216.73.216.249','view'),(14203,'2025-06-29 21:33:34','216.73.216.249','view')