[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-446128-105":59,"doc-detail-446128-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","new-technique-records-brains-magnetic-field","NEW TECHNIQUE RECORDS BRAIN'S MAGNETIC FIELD","","Scientists at MIT directly recorded the faint magnetic fields produced by electrical activity in the brain using magnetoencephalography (MEG). A subject sits inside a magnetically shielded chamber that blocks extraneous fields, including Earth’s field, while a highly sensitive superconducting magnetometer measures the resulting signals. MEG leverages the proportional relationship between current flow and magnetic fields, enabling comparison with simultaneous EEG recordings and revealing correlations and notable differences under certain conditions.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/new-technique-records-brains-magnetic-field/446128/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/new-technique-records-brains-magnetic-field/446128.png","ImageObject",300,407,{"name":92,"@type":93},"WPS_1786070896","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-22","2026-09-29",true,{"@type":102,"interactionType":103,"userInteractionCount":14},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does MEG measure in the brain?","Question",{"text":112,"@type":113},"MEG records faint magnetic fields arising from the brain’s electrical activity, produced by current flow associated with neural impulses.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Why is a magnetically shielded chamber necessary?",{"text":117,"@type":113},"It blocks extraneous magnetic fields, including Earth’s magnetic field, so the weak brain magnetic signals are not drowned out.",{"name":119,"@type":110,"acceptedAnswer":120},"How do MEG and EEG relate, and when can they differ?",{"text":121,"@type":113},"MEG and EEG can be taken simultaneously and often show close correlations; for example, alpha brain waves appear or disappear with eye opening/closing. However, MEG can differ from EEG in some situations, indicating MEG can add insight into brain activity.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},446128,1792693224,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":14,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":44,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144,"preview_page_count":4},549768072016,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","electro-technology  \nMarch 1972Volume 89,Number 3  \n# NEW TE CHNIQUE RECORDS BRAIN'S MAGNETIC FIELD\n\nScientists at the Massachusetts Institute of Technology havesucceeded in directly recording the faint magnetic fields thatarise from electrica1 activity within the brain.  \nThe technique—known as magnetoencephalography(MEG)—employsa highly sensitive superconducting magnetometer placed an inchor so from the head of a subject who is seated inside amagnetically shielded chamber.The chamber is constructed toshield against extraneous magnetic fields—including the Earth'smagnetic field—that otherwise would drown out the weak fieldof the brain.  \nMEG takes advantage of the fundamenta1 fact that al1 electriccurrent flow,no matter how smal1,has associated with it aproportional magnetic field.Thus,magnetic field readings canbe used as a measure of the current flow that produces them.This relationship can be extraordinarily important in the caseof the brain.There are something on the order of 10-bi1lionnerve cells in the brain which respond to and transmitelectric impulses.  \nThe MEG reading is produced on a strip chart with an ink stylusin the same familiar manner as an electroencephalogram(EEG)tracing.Because of the different techniques involved MEG andEEG readings can be taken simu1taneously and compared forresponse to the same electrical events in the brain.  \nClose correlations do occur between MEG and EEG readings,statedDr.David Cohen,physicist at MIT's Francis Bitter NationalMagnet Laboratory.For example,when normal subjects are askedto open and close their eyes,the presence and absence ofalpha brain waves which come and go when the eyes are open orshut clearly are evident in both methods.  \nThere are occasions,however,when the MEG appears quite differentfrom the EEG.It is this difference,Cohen said,that suggeststhe value of MEG recordings give a better understanding of  \nCopyright 1972,by Industrial Research Inc.,Bever1y Shores,Ind.Reproduction prohibited without permission.  \n又  \n\n| electrical activity in the brain.  \u003Cbr>The major problem encountered in Cohen's first experiments was  \u003Cbr>the strong magnetic fields that always are present in the earth's  \u003Cbr>environment.To ove rcome these effects he designed and built a  \u003Cbr>magnetically shielded chamber.Its walls are built from  \u003Cbr>three layers of highly magnetic nicke1-1ron alloy and two  \u003Cbr>layers of pure aluminum.The shape is rough1y that of a sphere.  \u003Cbr>Its shape together with the alloy has the effect of repelling  \u003Cbr>external magnetic fields.  \u003Cbr>In addition to the chamber,Cohen obtained one of the first  \u003Cbr>versions of a new superconducting magnetometer—called SQUID  \u003Cbr>for superconducting quantum interference device—developed at  \u003Cbr>the National Bureau of Standards.In the presence of weak  \u003Cbr>magnetic fields,the sQUID emits proportional electric signals  \u003Cbr>which are amplified to drive recording equipment.The sQUID,  \u003Cbr>with some refinements,enabled Cohen to measure some of the  \u003Cbr>electrical activity of the brain.  \u003Cbr>COMPUTER PROVIDES 3-D LOOK AT GLACIERS  \u003Cbr>A\"Ruggednova\"minicomputer is at the heart of an electronic  \u003Cbr>system which wil1 provide the first three-dimensional look  \u003Cbr>at glaciers.The minicomputer,manufactured by Rolm Inc.  \u003Cbr>Cupertino,Ca1.,is designed to operate in severe environments  \u003Cbr>on the ground as wel1 as in airborne applications.  \u003Cbr>The Ruggednova controls a mobile information gathering system  \u003Cbr>designed by Canadian scientists of the Dept.of Energy,Mines,  \u003Cbr>and Resources.The program—called Radio-Echo Sounding Project—  \u003Cbr>present1y is exploring the Columbia Ice-fields located on the  \u003Cbr>boundary of Alberta and British Columbia.  \u003Cbr>Mounted on a snow-cat type vehicle,the highly complex electronic  \u003Cbr>system sounds the depths of the glacier with a radar device  \u003Cbr>and navigates its course with a second radar system.The  \u003Cbr>Ruggednova computer controls the operation of the entire  \u003Cbr>electronics system,1ogs al1 data","cbCaihNBNTzpqhNU","https://ap.wps.com/l/cbCaihNBNTzpqhNU","pdf",3009807,"English","# NEW TECHNIQUE RECORDS BRAIN'S MAGNETIC FIELD\n## Magnetically shielded measurement setup\n## Superconducting magnetometer (MEG) principle\n## Comparison with EEG and observed differences\n## Early experimental challenges and chamber design","[{\"question\":\"What does MEG measure in the brain?\",\"answer\":\"MEG records faint magnetic fields arising from the brain’s electrical activity, produced by current flow associated with neural impulses.\"},{\"question\":\"Why is a magnetically shielded chamber necessary?\",\"answer\":\"It blocks extraneous magnetic fields, including Earth’s magnetic field, so the weak brain magnetic signals are not drowned out.\"},{\"question\":\"How do MEG and EEG relate, and when can they differ?\",\"answer\":\"MEG and EEG can be taken simultaneously and often show close correlations; for example, alpha brain waves appear or disappear with eye opening/closing. However, MEG can differ from EEG in some situations, indicating MEG can add insight into brain activity.\"}]","NEW TECHNIQUE RECORDS BRAIN'S MAGNETIC FIELD | PDF",1790714230,23]