http://exhibits.library.stonybrook.edu/mfp/files/original/6d4453f05c568057a0aed328635d98dc.pdf 79a6e2bf6eaaab18c29661ee31aca179 PDF Text Text July 29. 1963 Dr. Neil Burch Houstm State Psychiatric: Institute 1300 Moummd Houston 25 , Texas Dear Neil: Ithmbeenmmakssinmmspm.butflmhawnotbmidlm his letterisovom, so letmtakeeam immsexially. m 9mm» mny themes for the digital cards fran'mlm. The ,perfecmd «1 this material. In comaring cur analyses. the two diffemd in mspmse to-mther manges to mm mm or mm not wanted in the first derivative.” After finding this dismpanw, the prom was nodal. Our analyses were than identical to mdified t9 fit the yours. from John Stern and these wen 2. We obtained two digitized mla'tad tad me writenmts The were clearly resulting spectra malyzed. which he pmvided. l. m 1 ' t . mm ' Inbothmaseanalyses,webecaneomoormdabmtflumlim problem. First, the 'mlane moord mquimd an "artificial" baseline (the mean of first 1500 points). This was satisfactory because later samples from this Muslim. In tha first Stem samples did away above and below the the that meow, hwaver, As had we no good solution, ow error was com-baseline markedly. initial deymdifyingflmmwtopmvidecmmtamlms ofasmmy showed no as 5 doviatim mistent fauna baselines. we Such data also yielded mum information. W. asimwaveWmeEEG. mteringtm aim we decided, that the least Lately. in thinking this problem from baseline after recording was solution mm a to analyze artificial onthe tapebybias adjustments and recording 1313 ES wifimt ovum» adjustmt. baselim adeqmm. this mien successfully and fomd a m r/ We have done �m». Neil aura; Our oquipmnt progress has been 3. July 29. ~2- rapid. Last week. the 1963 1710 systemwas installed and on I-‘tidaym were ablo to memo moan moord on tape; digtiu at 320 and one 1312:. per second; analyze successive 24/2, 3, 5, 10 seomd epochs abwt 0. tom baseline. The muting 3mm, and Guam with pcntotbnl, was very 300d. In lockingat tho first derivatiw canton» famdthatwehadtoommh noise. Our Offmr has ”choppers" at non ops (lodco more like: 60 cps) which Thismk'a pmject-tooloanupmmsimlontapo. Wand. will not be in mtil mid-Manta and our plotter in Seytonber. new EEG Octoberwahopetobeopomtimalviaupo. u. Behave G.P.D.C." with a report " modandmawmmm”hriodm1wisoffissm and qwstims few, as tho intemst. (Mr is straightforward; . a. Our .By mats m ~ Themismstamntintminmtionoftmflwozyw the goals of the analyses. For ammo, we we ootmmod as to rational: for 2nd derivative Minamoto? How are those to be intorpmetod in View of the "noise" of our amplifiers? ' b. On page 10. the oonoem about the major index asymtry mounts side to the baseline problem. If a "true" baselim were deter» different a ntimd, amd if EEG waves were truly symetric, than the positive and negative indioos wwld be equal. But, is there any masm to expect EEG signals to be ammo? For mangle, the 3 ops spike and wave is asyzmetric. I wmld suggest that the symtr-y of positive and negative counts be accepted as a more of the wave characteristics; provided, a nm—arbitrazy way can be famd to detemzine a reliable ("standard”) baseline. 0. We are concerned with the loss of informtim inherent in filters conversion; and mnning averages. Yaw method of obtaining is desimod to reflect the fast activity a By filtering and averaging , the record is indeed on a slower clamor but a potential source of information is precluded. Why not keep all the jitter and study it? 2nd before A-D derivative (and lot deriVative) War. ' . d. Pmntlutioally. mm Pmst and Nooll successful? 5. Enclosed is a paw writo~mt of cum analysis of your data, for 5 baselines. This sample ohm the prom permitting analyses of 5 «masses. and lot and 2nd derivative for up to 15 band widths. Epodx aim mm Wmmmm andnmorofepochs oanalaobevariodatwill. of the average froquoncy memo for the total sample. "Oounts" a of motor baselfimemqoa (or derivative cunts). Also, the oaloulotim of mm �Dr. Neil Burch July 29, «~3— 1963 the mam square of amplitude duviatims frm basalim at points when lit (Mean sq. derivative is zero gives an index of m. s awn/mu). mum Weammwolemingupmrmplifierayam.mdaasomasmtis todaaamllstudyofvaxyingmtofialmums indiffemnt dam. :iplan popula one. in tbs shéuld momma. Wag mtoemymtthismriam. mobsumtismmlm.hmom, 6. Thanks for EEG abatmat.“if~.’n‘xat mmtammmmmmmmmmmmmtw. m Memzile. have ymr assistants had a damn at the, tapes? Just mad a blmb that you will 30m have tapes of the 3.3mm. That project sounds like em awaiting application of yam data reductim methods. I mld be pleasod to read any am yam mp isms. mm - Good luck, and my best mgards. Sinoamly ypum. Max Fink, Director Mf'dr Emlosums M. D. � Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Correspondence Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Correspondence to: Burch, Neil Type The nature or genre of the resource Text Identifier An unambiguous reference to the resource within a given context mfp-05-00-017-6-356 Date A point or period of time associated with an event in the lifecycle of the resource 1963 Creator An entity primarily responsible for making the resource <a title="Fink, Max, 1923-" href="http://id.loc.gov/authorities/names/n79039548" target="_blank">Fink, Max, 1923-</a> Subject The topic of the resource Correspondence -- Correspondence Relation A related resource The Max Fink Collection Description An account of the resource Rights Information about rights held in and over the resource <a title="IN COPYRIGHT - EDUCATIONAL USE PERMITTED" href="http://rightsstatements.org/vocab/InC-EDU/1.0/" target="_blank">IN COPYRIGHT - EDUCATIONAL USE PERMITTED</a> Source A related resource from which the described resource is derived Special Collections and University Archives, University Libraries. 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