http://exhibits.library.stonybrook.edu/mfp/files/original/3fb900a331666c02ac75e069783f0d41.pdf defb55f10f5444ed1e3f7cc02bc8e0a1 PDF Text Text July 16, 1968 Dr. Ardie Lubin Research Psychologist Navy Medical Neuropsychiatric Research Unit San Diego. California 92l52 Dear Ardie, It was kind of you to send me the preprint of your effort in discriminating sleep stages. It represents latest much work to read it. since I have just revised the paper of our period analytic approach to the same problem, following some suggestions from the editors of the EEG Journal. The revised version is enclosed and represents much of the data from the Missouri laboratory, exce t that there are additional tables such as you request spage l6§ describing the relation of the computer classification to the visual by the trained observers. This data is being prepared for another publication. but I am sending your preprint to Dr. Itil with a request he share the data with you for inclusion in your report. and I appreciate the opportunity I am impressed by the portrayal of the power spectral density approach, especially by the complexity and by the implicit expense. difficulties which you describe - difficulties which are described this approach. and also found by ourselves - are the lack of discrimination of small differences in this method. The by others trying Perhaps the lack of discrimination is related to the paucity of samples for study ~ if I understand, you analyzed l8 selected minutes of an all night sleep recording. This small sample is related to the cost of power spectrum. That PNRS shows good discrimination among sleep stages by the delta band, the unimportance of theta, the significance of alpha and sigma, and the difficulties of discriminating stage I from stage I-REH and stgge 3 from stages 2 and 4 are the same problems we faced in power spectrum. Additional discriminations are possible in period analysis. for the stage I - stage I-REM discrimination is now available; the stage 3 discrimination is feasible following your suggestions (page l8) and some of our own. �Dr. Lub1n Ju1y 16, 1968 -2— Some of the I agree w1th your conc1us1ons (page 17). recommended add1t1ona1 data 13 ava11ab1e or 15 read11y programmab1e us1ng per1od ana1yt1c and the d1stance funct1on ‘ approaches. Perhaps the t1me has come to compare the ava11ab1e methods for systemat1ca11y co11ected data. As I 1nd1cated ear11er, we are prepared to ana1yze tapes us1ng the per1od ana1yt1c methods. We wou1d be spec1a11y 1nterested 1f they are a1so to be ana1yzed by)our methods. The costs 1n do11ars and t1me are negot1ab1e and shou1d compare favorab1y w1th the expense and delays wh1ch you descr1bed for your present systems. Such ana1yses cou1d be done as part of a demonstrat1on for an APSS meet1ng and as the bas1s for a d1scuss1on of the ava11ab1e methods. If th1s is not feas1b1e, we wou1d st111 be w1111ng to cons1der a demonstrat1on for you at a cost that 15 comparab1e to that of Astropower. It was a p1easure to hear your report 1n Wash1ngton, and to read th1s prepr1nt. Perhaps the enc1osed report W111 perm1t you to be more opt1m1st1c about th1s rea1—t1me (or 2-4x rea1 t1me) ana1yt1c system for the re11ab1e and automat1c scor1ng of EEG sleep stages. My best regards. S1ncere1y yours, /flax F1nk, M. D. Professor of Psych1atry Mszp � 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/. 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Title A name given to the resource Correspondence to: Lubin, Ardie Type The nature or genre of the resource Text Identifier An unambiguous reference to the resource within a given context mfp-05-00-022-3-263 Date A point or period of time associated with an event in the lifecycle of the resource 1968 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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