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T.-I.-T. journal of life sciences最新文献

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Oscillatory potentials in the electroretinogram. 视网膜电图的振荡电位。
T.-I.-T. journal of life sciences Pub Date : 1979-01-01 DOI: 10.7551/mitpress/5557.003.0060
J. Levett, J. D. McAvinn
{"title":"Oscillatory potentials in the electroretinogram.","authors":"J. Levett, J. D. McAvinn","doi":"10.7551/mitpress/5557.003.0060","DOIUrl":"https://doi.org/10.7551/mitpress/5557.003.0060","url":null,"abstract":"This paper presents an analog circuit model of the electroretinogram b-wave and subsequent oscillations postulated to result from the depolarization of the retinal glial cells produced by potassium. The system is described by a second-order equation which oscillates under conditions of light adaptation. With dark adaptation the oscillations undergo attenuation. Light falling on the retina ultimately liberates potassium ions and this ionic current is considered to be the system input. A first approximation is an exponentially decaying current which varies depending upon light background, flash intensity and various drug manipulations. This model is a reasonable fit to the electroretinogram over considerable light background levels and is suggested as a useful tool in the study of various pharmacological effects on retinal electrophysiology.","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"9 1-2 1","pages":"19-27"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71239684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Measuring the stimulating energy threshold in living tissues. 测量活体组织的刺激能量阈值。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
L Bedini, F Denoth, C Contini
{"title":"Measuring the stimulating energy threshold in living tissues.","authors":"L Bedini,&nbsp;F Denoth,&nbsp;C Contini","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The paper summarizes the various methods of measuring the stimulation threshold in living tissues and emphasizes the usefulness of energy measures. An analog instrument for the direct measurement of the energy threshold is proposed and some experimental results obtained by its clinical application are reported.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"37-40"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11940786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Intracranial pressure regulation: a comparative model of cerebrospinal fluid systems. 颅内压调节:脑脊液系统的比较模型。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
R N Johnson, C J Maffeo, J D Mann, A B Butler, N H Bass
{"title":"Intracranial pressure regulation: a comparative model of cerebrospinal fluid systems.","authors":"R N Johnson,&nbsp;C J Maffeo,&nbsp;J D Mann,&nbsp;A B Butler,&nbsp;N H Bass","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A comparative model of the cerebrospinal fluid (CSF) system in rat, dog and man was derived from manometric data using low volume, short duration infusions into the subarchanoid space in order to describe the mechanisms governing intracranial pressure dynamics. The mathematical model indicates that steady-state elevations of intracranial pressure are regulated primarily by a nonlinear, pressure dependent outflow resistance to CSF reabsorption. While the form of the resistance relationship is similar for the three species tested, differences in the magnitude of CSF outflow parameters are apparent. Model stimulation on a digital computer suggests that parameter changes within the resistance relationship can have a profound effect on the intracranial pressure. In contrast, intracranial compliance acts only to buffer transient changes in volume prior to the establishment of steady-state CSF pressures.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 3-4","pages":"79-92"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11954163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advances in nonimplantable electrical stimualtors for correction of urinary incontinence. 非植入式电刺激矫治尿失禁的研究进展。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
P Suhel, B Kralj, S Plevnik
{"title":"Advances in nonimplantable electrical stimualtors for correction of urinary incontinence.","authors":"P Suhel,&nbsp;B Kralj,&nbsp;S Plevnik","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The nonimplantable electrical stimulators are widely used as rehabilitation aids for correction of urinary incontinence. The advances in the field of the design of nonimplantable electrical stimulators such as automatic vaginal electrical stimulator VAGICON-X and anal pressure controlled electrical stimulator are described. The evaluation of VAGICON-X in patients suffering from stress and urge incontinence as well as preliminary results of acute application of anal pressure electrical stimulation in patients with stress incontinence as presented.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"11-6"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11524745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EEG evoked response, P300 and CNV during processing of sentence information: clinical application. 脑电诱发反应、P300和CNV在句子信息加工中的临床应用。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
H Goto, T Adachi, T Utsunomiya, H Nakano, K Chin
{"title":"EEG evoked response, P300 and CNV during processing of sentence information: clinical application.","authors":"H Goto,&nbsp;T Adachi,&nbsp;T Utsunomiya,&nbsp;H Nakano,&nbsp;K Chin","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Evoked response, P300 and CNV were investigated in the condition in which the subject was required to make a differential response to the acoustically and visually presented sentence with or without meaning, and he was able to determine whether the sentence had a meaning or not by understanding the key information. In healthy persons, P300 amplitude to the beginning of information and to the key information were larger than those to the others. P300 latency to the key character was longer. CNV appeared at the beginning of information and continued. The difference between CNVs produced by meaningful and meaningless sentences was observed after the key information. In aphasia, the difference between CNV's was not observed. In auditory agnosia, the difference between CNVs was not observed to acoustic sentences, but appeared to visual sentences. These results suggest that evoked response, P300 and CNV can be useful for assessing recognition of sentences.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"55-8"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11941770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On-line evaluation of the muscle transfer function--a possible test for rehabilitation purposes. 在线评估肌肉传递功能——一种可能用于康复目的的测试。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
M Bracale, M Caiazzo, F Petraccaro
{"title":"On-line evaluation of the muscle transfer function--a possible test for rehabilitation purposes.","authors":"M Bracale,&nbsp;M Caiazzo,&nbsp;F Petraccaro","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"5-10"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11524747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Present state and prospects in the design of multichannel FES stimulators for gait correction in paretic patients. 多通道FES刺激器的设计现状与展望。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
A Trnkoczy, U Stanic, M Malezic
{"title":"Present state and prospects in the design of multichannel FES stimulators for gait correction in paretic patients.","authors":"A Trnkoczy,&nbsp;U Stanic,&nbsp;M Malezic","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Use of multichannel electrical stimulators (MES) for the rehabilitation of patients with plegic or paretic extremity muscles in one of the most promising trends in rehabilitation. Two clinically oriented therapeutic stimulators are described. The aim and the realization of walking rate dependent functioning, gradually modulated stimulation sequences, mini-computer and hardware closed-loop control of stimulation amplitude are described. The difficulties arising from the poor interface between the technical and biological part of the system prevent the described stimulators from being used as orthotic devices. Experiments with three types of electrodes are given, and the problem of an excessive mounting time for most clinical environments is also stressed.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"17-27"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11524746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A model of the mechanism controlling neuromuscular activation during ambulation based on feedback control hypothhesis. 基于反馈控制假说的行走过程中神经肌肉激活控制机制模型。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
C Frigo, A Pedotti
{"title":"A model of the mechanism controlling neuromuscular activation during ambulation based on feedback control hypothhesis.","authors":"C Frigo,&nbsp;A Pedotti","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>As tested by many investigators, locomotor performance at steady state does not involve high conscious systems but takes place almost automatically. A great number of experiments on animals seem to demonstrate that the afferent proprioceptive signals play an important role in locomotion and that the higher nervous centers act in order to activate the lower control systems. On the basis of previous findings, we hypothesized that the descending signal from the higher nervous centers can lower the threshold of intervention of the proprioceptive signals on the alpha-motoneurons. The influences of the afferent signals on the various muscles enable them to realize the pattern of the basic muscular activity that we can record from walking subjects. A simulation of the model of human locomotion has been implemented on a digital computer and the theoretical results are compared with the experimental findings.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"29-35"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11940785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrical impedance brain scanner: principles and preliminary results of simulation. 电阻抗脑扫描仪:原理和模拟的初步结果。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
A L Benabid, L Balme, J C Persat, M Belleville, J P Chirossel, M Buyle-Bodin, J de Rougemont, C Poupot
{"title":"Electrical impedance brain scanner: principles and preliminary results of simulation.","authors":"A L Benabid,&nbsp;L Balme,&nbsp;J C Persat,&nbsp;M Belleville,&nbsp;J P Chirossel,&nbsp;M Buyle-Bodin,&nbsp;J de Rougemont,&nbsp;C Poupot","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In previous studies, the authors have shown the importance of impedance recording by stereotactic procedures for brain tumor detection. In this study they report the principles and the first results of an attempt to obtain the impedance value of any given point inside the brain by an external way. The experimental device is mainly made of a set of 128 electrodes, surrounded by an electrode guarding monitored by an operational amplifier the purpose of which is to made the electric field uniform and to enable a focused measure of the impedance by each of the 128 electrodes. The effect of this electrode guarding is demonstrated, and the present sensitivity of the prototype is shown on various obstacles. conductive or non-conductive; the influence of an impedance barrier on this sensitivity is the project of an impedometric scanner is described, and the problems due to the non-linear propagation of electric currents and to the anisotropic properties of the brain tissue are evaluated.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"59-68"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11941771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Resolution of electrostatic field due to nerve or muscular spikes for EMG analysis. 由神经或肌肉尖峰引起的静电场的分辨用于肌电图分析。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
L Divieti, B Mambrito
{"title":"Resolution of electrostatic field due to nerve or muscular spikes for EMG analysis.","authors":"L Divieti,&nbsp;B Mambrito","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"69-72"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11941772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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