Дисертації з теми "Coherent oscillations"
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Jerebtsov, Serguei Nikolaevich. "Femtosecond time-resolved spectroscopy of coherent oscillations in nanomaterials." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1358.
Повний текст джерелаBlum, Julia Maria. "Coherent brain oscillations during processes of human sensorimotor learning /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17951.
Повний текст джерелаBuehlmann, Andrés. "Information processing in the cortex: the relevance of coherent oscillations for neuronal communication." Doctoral thesis, Universitat Pompeu Fabra, 2010. http://hdl.handle.net/10803/7566.
Повний текст джерелаOscillatory neuronal activity is an omnipresent phenomenon in the cerebral cortex. However, the actual function of these oscillations remains unclear. Are they just an epiphenomenon of elevated firing rates or do they represent a fundamental process on their own? Based on experimental work, we apply computational modeling to address this question. We first study the role of oscillations in attentional processes and then in a more general, information theoretical context. Our results support the idea that oscillations represent an independent mechanism. In particular, we show that attention modulates gamma oscillations independently of rates and that the flow of information between brain areas depends both on the phase and on the spectral power of oscillations. Moreover, we show that the speed of information exchange increases as a function of spectral power in specific frequency bands. Taken together, these results suggest that oscillations are a mechanism employed by the brain to control actual interactions between brain areas and thus likely have a link to behavior.
Karpov, Ivan [Verfasser], Oliver [Akademischer Betreuer] Boine-Frankenheim, and Shaukat [Akademischer Betreuer] Khan. "Damping of Coherent Oscillations in Intense Ion Beams / Ivan Karpov ; Oliver Boine-Frankenheim, Shaukat Khan." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1125627530/34.
Повний текст джерелаMagnuson, Matthew Evan. "Effects of severing the corpus callosum on coherent electrical and hemodynamic interhemispheric oscillations intrinsic to functional brain networks." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47681.
Повний текст джерелаMarsh, Richard. "Superconducting phase coherent electron transport in nano-engineered ferromagnetic vortices." Thesis, Royal Holloway, University of London, 2013. http://repository.royalholloway.ac.uk/items/66b15a59-0b9f-4e68-b0aa-47e93f77349a/6/.
Повний текст джерелаGrinberg, Patricio. "Slow light in two dimensional semi-conductor photonic crystals." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00830962.
Повний текст джерелаDelagnes, Jean-Christophe. "Contrôle de la propagation d'impulsions ultracourtes : effets de déplacements lumineux." Toulouse 3, 2005. http://www.theses.fr/2005TOU30227.
Повний текст джерелаThe topic of this work deals with theoretical and experimental study of the control of ultrashort pulse coherent propagation in optically dense medium. First, we describe the basics of propagation phenomena. Secondly, we study the idea of using a strong driving pulse, to control the transient properties of a weak resonant pulse simultaneously propagating in the medium. The strong field induces transient modifications in the medium, which modify the electric field of the weak resonant propagating pulse. Finally, we study a configuration where two orthogonally polarized pulses, excite resonantly a four level system degenerated two by two. With the strong field mixing the states, the emission and absorption path of the weak field have similar contribution. The two paths interfere thus modulating the transmitted pulse energy. The interplay of the light shift and the interference enables us to control the gain and the pulse temporal shape as well
Witham, Claire. "Oscillations and corticomuscular coherence in the sensorimotor system." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440587.
Повний текст джерелаTitimbo, Chaparro Kelvin Ruben. "CREATION AND DETECTION OF SQUEEZED PHONONS IN PUMP AND PROBE EXPERIMENTS: A FULLY QUANTUM TREATMENT." Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/10941.
Повний текст джерелаFemtosecond pump and probe techniques are standard experimental methodologies used for studying ultrafast dynamics in solids, in particular phonon oscillations in target materials. So far, only semiclassical methods have been employed in order to theoretically interpret the experimental data. In contrast, a fully quantum treatment will be presented here taking into account the quantum features of the generation mechanism of excited phonons by pump laser pulses, and of the process of accessing their behaviour by probe laser pulses. A single effective Hamiltonian will be used to model the interaction between photons and phonons both for the pumping and probing processes. In addition, as they interact with their environment, mainly electrons in the target, the excited phonons cannot be considered an isolated system. Their dynamics is then that typical of open quantum systems and generated by a master equation of Lindblad form, that takes into account the dissipative and noisy effects due to the environment.In this formalism, phonon oscillations can be analysed through suitable probe photon observables. Specifically, unlike in the existing literature, we will not focus only upon the scattered probe pulse intensity, namely on the probe photon number, but also on the number variance. Through the latter some quantum features of the phonon state can be accessed; in particular, specific signals of the presence of squeezed phonons can thus be identified.
Le tecniche di "pump and probe" impulsato sono metodologie sperimentali standard usate nello studio delle dinamiche ultraveloci nei solidi, in particolare delle oscillazioni di fononi. Usualmente l'interpretazione teorica dei dati sperimentali si basa su approssimazioni semiclassiche. Una descrizione completamente quantistica e` invece sviluppata nella presente trattazione: e` basata sull'introduzione di un'unica hamiltoniana di interazione tra fotoni e fononi, capace di descrivere in modo effettivo sia il processo di eccitazione che di rivelazione dei fononi. In generale, tali fononi non possono essere considerati come isolati, ma costituiscono un sistema quantistico aperto, cioe` in interazione debole con l'ambiente esterno, formato principalmente da elettroni e dagli altri costituenti del materiale in studio. La loro dinamica deve percio` venir descritta tramite una equazione master, che tenga conto di effetti di rumore e dissipazione. In questo formalismo, le proprieta` dei fononi eccitati dagli impulsi laser di "pump" possono essere analizzate attraverso lo studio di opportune osservabili caratterizzanti i fotoni di "probe". Piu` specificatamente, si e` analizzato il comportamento non solo dell'intensita` media della luce di "probe" riflessa, cioe` del numero medio di fotoni, ma anche della relativa varianza. In questo modo, si possono evidenziare alcune caratteristiche quantistiche dei fononi: in particolare, sono stati individuati segnali specifici della presenza di fononi "squeezed"
XXVII Ciclo
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Gundry, Sarah. "Implementation of an ultra-broadband high power frequency modulator based on coherent molecular oscillation." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413552.
Повний текст джерелаPerrier, Pierre. "Fluctuations universelles de conductance dans des systèmes mésoscopiques magnétiques." Grenoble 1, 1991. http://www.theses.fr/1991GRE10169.
Повний текст джерелаBerger, Perrine. "Lumière lente et rapide dans les amplificateurs optiques à semi-conducteurs pour des applications en optique micro-onde et aux RADAR." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112027/document.
Повний текст джерелаSlow and fast light is becoming a wide research field driven by an extensive effort to implement this new technology in real applications. Coherent population oscillations in semiconductor optical amplifiers constitute one of the most promising approaches, in particular for the processing of optically carried microwave signals, which includes the control of tunable true time delays and RF phase shifts.We studied theoretically and experimentally the available tunable delays and phase shifts and the associated bandwidths for a microwave photonics link including a semiconductor optical amplifier. We analyzed the influence of the coherent population oscillations on the dynamic range of the link.The understanding of the underlying physical mechanisms led us to propose new architectures in order to overcome the identified limitations of the components. We show how up-converted coherent population oscillations enable to get rid of the intrinsic limitation of the carrier lifetime (500 MHz), leading to the generation of true time delays at any high frequencies in a single semiconductor device. We demonstrated tunable delays up to 389 ps at 16 GHz, with an instantaneous bandwidth of 360 MHz.Lastly we demonstrate how to conceive a RF phase shifter up to 180 degrees at high frequency by forced coherent population oscillations. This effect replaces the enhancement of the coherent population oscillations by gain-index coupling effect, revealed by an optical filter. We used this principle, which enables to achieve a tunable phase shift up to 162 degrees at 2,2 GHz, in order to conceive an optoelectronic oscillator at 2,2 GHz. The frequency of this oscillator is fast tunable over 6 MHz by changing the current of the semiconductor amplifier
Kirsten, Lars, Anke Burkhardt, Jonas Golde, Julia Walther, Thomas Stoppe, Matthias Bornitz, Max Kemper, Thomas Zahnert, and Edmund Koch. "Imaging the tympanic membrane oscillation ex vivo with Doppler optical coherence tomography during simulated Eustachian catarrh." SPIE, 2015. https://tud.qucosa.de/id/qucosa%3A35042.
Повний текст джерелаHaig, Albert Roland. "Missing Links the role of phase synchronous gamma oscillations in normal cognition and their dysfunction in schizophrenia." University of Sydney. Psychological Medicine, 2002. http://hdl.handle.net/2123/848.
Повний текст джерелаSupe, Kristin Edwards. "Role of Rat Neuronal Oscillations in Acquisition and Disruption of Working Memory with Acute Ethanol." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1404732893.
Повний текст джерелаWang, Yunli. "Etude expérimentale et numérique des oscillations hydrodynamiques en milieux poreux partiellement saturés." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0127/document.
Повний текст джерелаThis thesis aims at investigating experimentally, analytically and numerically, the consequences of hydrodynamic variations and oscillations with high temporal variability in partially saturated porous media. The problems investigated in this work involve “free surfaces” both outside and inside the porous media, the free surface being defined as the “atmospheric” water pressure isosurface (Pwater = Patm). The laboratory experiments studied in this work are, respectively: Lateral imbibition in a dry sand box with significant capillary effects; Transmission of oscillations of the free surface through a vertical sand box placed in a small wave canal (IMFT, Toulouse); Dynamics of free surface oscillations and wave propagation in a large wave canal (HYDRALAB, Barcelona), partially covered with sand, with measurements of both open water and groundwater levels, and of sand topography (erosion / deposition). For theoretical studies, we have developed linearized analytical solutions. Here is a sample problem that was treated analytically in this work: The linearized equation of Dupuit-Boussinesq (DB) for transient free surface flow, assuming horizontal flow and instantaneous wetting/drainage of the unsaturated zone: forced oscillations, wave transmission and dissipation through a rectangular sandbox. We also developed a weakly nonlinear solution of the Dupuit-Boussinesq equation to study the sudden imbibition (temporal monitoring of the wetting front). We have studied the different types of transient flow problems related to the experiments cited above by numerical simulation. In particular, we have simulated unsaturated or partially saturated transient flows in vertical cross-section, using a computer code (BIGFLOW 3D) which solves a generalized version of Richards’ equation. Thus, using the Richards / BIGFLOW 3D model, we have studied numerically the experiment of unsaturated imbibition in a dry sand (IMFT sandbox), and then, with the same model, we have also studied the partially saturated wave propagation experiment in the large Barcelona wave canal (HYDRALAB laboratory), focusing on the sloping sandy beach, with coupling between the micro-porous zone (sand) and the “macro-porous” zone (open water). To interpret the results of the latter experiment and compare them to simulations, we use several methods of signal analyzis and signal processing, such as: Fourier analysis, discrete multi-resolution wavelets (Daubechies), auto and cross-correlation functions. These methods are combined with pre-filtering methods to estimate trends and residuals (moving averages; discrete wavelet analyses). This signal analyzis has allowed us to interpret and quantify water propagation phenomena through a sandy beach. To sum up, different modeling approaches, combined with model calibration procedures, were applied to transient nonlinear coupled flow problems. These approaches have allowed us to reproduce globally the water content distributions and water level propagation in the different configurations studied in this work
Blomberg, Rina. "CORTICAL PHASE SYNCHRONISATION MEDIATES NATURAL FACE-SPEECH PERCEPTION." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122825.
Повний текст джерелаVahidnia, Arash. "Wide area control through aggregation of power systems." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/61186/1/Arash_Vahidnia_Thesis.pdf.
Повний текст джерелаHuang, Wenyu. "Fundamental studies of the interaction between femtosecond laser and patterned monolayer plasmonic nanostructures." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/24786.
Повний текст джерелаCommittee Chair: El-Sayed, Mostafa A.; Committee Member: Perry, Joseph W.; Committee Member: Srinivasarao, Mohan; Committee Member: Whetten, Robert L.; Committee Member: Zhang, Z. John.
Karpov, Ivan. "Damping of Coherent Oscillations in Intense Ion Beams." Phd thesis, 2017. https://tuprints.ulb.tu-darmstadt.de/5983/1/Karpov_thesis.pdf.
Повний текст джерелаBarannyk, Oleksandr. "Shear layer instabilities and flow-acoustic coupling in valves: application to power plant components and cardiovascular devices." Thesis, 2014. http://hdl.handle.net/1828/5372.
Повний текст джерелаGraduate
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Feist, Armin. "Next-Generation Ultrafast Transmission Electron Microscopy – Development and Applications." Thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E48B-B.
Повний текст джерелаKim, Jisun Ph D. "Study of quantum thin films : phase relationship, surface reactivity, and coherent coupling." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-3842.
Повний текст джерелаtext
Shen, Yu-Kai, and 沈昱凱. "Investigation of ultrafast carrier dynamics and coherent acoustic phonons oscillation in ZnO by the transient pump-probe technique." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/w2t8sp.
Повний текст джерела國立臺北科技大學
光電工程系研究所
101
In this thesis, we investigated the ultrafast carrier dynamics and the coherent acoustic phonons (CAPs) in high quality epitaxial ZnO thin films on c-Si substrate by the degenerate transient reflection pump-probe technique, using a frequency doubling femtosecond Ti:sapphire laser as the light source. In order to success grow the ZnO on the silicon substrate, yttrium-doped hafnium oxide (YDH) is used as a buffer layer. The reflection and photoluminescence spectrum of the sample reveal two emission peaks at 378 and 385 nm (3.28 and 3.22 eV) that corresponds to the free exciton emission and LO-phonon replica. In pump-probe measurement, the central wavelength of the UV pulse is tuned from 355 to 385 nm corresponding to the conduction band to shallow band-tail (3.49-3.22eV) of this sample. As excited photon energy above conduction band (355-369 nm, 3.49-3.36 eV), the measured positive transient differential reflectance change (TDRC) is due to the band filling effect. The free carrier relaxations include two exponential decays, the fast decay is non-radiation recombination time, and the slow decay is due to radiation recombination time. In addition, a relative fast decay time below 1-ps around exciton resonance is due to exciton-exciton scattering (375-379 nm, 3.31-3.27 eV). When the photo-excited energy is located at shallow band-tail (380-385 nm, 3.26-3.22 eV), the TDRC transfer from positive to negative is due to the resonance. The subsequent coherent acoustic phonons (CAPs) oscillation is superimposed on the TDRC within 200 ps, with the order of amplitude around 10−4, and the oscillation frequency around 80 GHz. It is recognized that the CAPs is mainly due to electric stress of deformation potential coupling. From the oscillation frequency of CAPs, the refractive index of ZnO is obtained, which is similar with the estimated value from Sellmeier equation. The velocity of CAPs around 6089 m/s propagation in ZnO can be obtained, from the plot of the angular frequency versus wave vector. The obtained velocity is close to the theory calculation of sound wave propagation velocity in ZnO.
Riese, Michael. "Study of large-scale coherent structures in the near field and transition regions of a mechanically oscillated planar jet." 2009. http://hdl.handle.net/2440/54150.
Повний текст джерелаhttp://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1349701
Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2009
Cannon, Jonathan. "On the interaction of gamma-rhythmic neuronal populations." Thesis, 2014. https://hdl.handle.net/2144/15290.
Повний текст джерелаYang, Shang-Lin, and 楊尚霖. "Laser spiking and relaxation oscillation in optical vortex formed by the coherent superposition of off-axis multiple pass transverse modes in an azimuthal symmetry-breaking laser resonator." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/h2jnfn.
Повний текст джерела國立中山大學
光電工程學系研究所
106
Optical vortex (OV) is a special morphological beam with orbital angular momentum. It has a ring shape with no energy at the center. In recent years, there have been many applications associated with optical vortex beam, such as STED microscopy, OAM multiplexing optical communication, optical tweezers and the like. Upon the demand of the applications, high quality optical vortex is necessary and there are many different methods to achieve this goal, such as the pump beam shaping, fiber-based amplifier with mode conversion, and degenerate cavity with intra-cavity spiral phase plate (SPP). In particular, a nearly hemi-spherical cavity with SPP produces OV with ultrahigh vortex purity of more than 99.99%. In such a laser configuration, the OV is formed as a coherent superposition of off-axis multiple pass transverse modes circulating in the resonator. They retrace a periodic orbital when travels twice roundtrips and form a V-shaped optical path. The phases of the beamlets traveling a MPT modes are then correlated by the strong coupling during the stimulated emission process in the laser gain medium and can be understood by the Kuromoto model under the minimum energy criterion. In this new laser configuration, built up dynamics has never been explored. Multi-mode relaxation oscillations in lasers can be modeled by Tang-Statz-deMars (TSD) equation. It is found that modes with unbalanced gain volume results in irregular relaxation oscillation for each mode while the intensity sum of all modes remains regular. However, the relaxation dynamics in our optical vortex produces irregular but synchronized spiking and relaxation oscillation across the spatial measurement. By introducing coupling terms between modes in to the photon equations in TSD equations, the spiking and relaxation synchronizations among modes can be explained. Experiments with a varying gain volume and coupling strength showed degradation in the correlation of signals taken from different oscillating modes as can be expected by TSD equations with photon mode couplings. Moreover it is also found that during the laser spiking phase, the optical vortex output shows a regular high and low changes, which we believe is due to the interplay between competition and couplings among the resonating modes.
Scalo, CARLO. "Large-eddy simulation and modelling of dissolved oxygen transport and depletion in water bodies." Thesis, 2012. http://hdl.handle.net/1974/7298.
Повний текст джерелаThesis (Ph.D, Mechanical and Materials Engineering) -- Queen's University, 2012-07-04 11:13:24.936
Pabel, Stefanie Corinna. "Manipulation of the Working Memory Performance in Humans using Transcranial Alternating Current Stimulation over the Frontoparietal Network." Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E4FF-9.
Повний текст джерелаSantos, João Pedro Mateus Gens dos. "Brain circuits involved in self-paced motion: the influence of 0.1 Hz waves." Master's thesis, 2016. http://hdl.handle.net/10362/18305.
Повний текст джерелаHelmer, Markus. "Attention: A Complex System." Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0028-867C-6.
Повний текст джерелаΤσαρούχας, Νικόλαος. "Electrophysiologιcal study of brain hypoxia". Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/4120.
Повний текст джерелаΗ παρούσα ερευνητική εργασία στοχεύει στην ανάπτυξη εργαλείων Βιοϊατρικής Νευρομηχανικής (Βιοτεχνολογίες) για την σε βάθος λειτουργική μελέτη, ταχεία διάγνωση, συνεχή παρακολούθηση και έγκαιρη αντιμετώπιση οξέων και χρόνιων εγκεφαλικών διαταραχών, ατόμων που υπόκεινται σε ή πάσχουν από οιαδήποτε μορφή συστηματικής υποξαιμίας ή πιο εντοπισμένης εγκεφαλικής υποξίας, καθώς και για την λειτουργική αξιολόγηση και το συνεχή έλεγχο της προσαρμοστικότητας κατά την εξάσκηση των «υψιβατών», και γενικότερα ατόμων που ασκούν δραστηριότητες και λειτουργούν μέσα σε περιβάλλοντα αυξημένων οπτικο-γνωστικο-κινητικών απαιτήσεων (ένα είδος «στρες τεστ» για τον εγκέφαλο). Για το σκοπό αυτό υποβάλλουμε ολόκληρο το οπτικογνωστικό σύστημα, από το στοιχειώδες αισθητηριακό έως το πιο πολύπλοκο νοητικό επίπεδο, σε μια πειραματική δοκιμασία κατηγορικής διάκρισης σύνθετων οπτικογνωστικών ερεθισμάτων, μετά από υπερταχεία οπτική διέγερση που οδηγεί στην έκλυση κινητικής απάντησης κατά την κατηγοριοποίηση στόχων (εικόνες «ζώων» εκλύουν παραγωγικές αποκρίσεις) και στην καταστολή της κατά την κατηγοριοποίηση μη-στόχων (εικόνες «μη-ζώων» εκλύουν ανασταλτικές αποκρίσεις). Οι ταλαντωτικές ηλεκτροφυσιολογικές αποκρίσεις που συγχρόνως καταγράφονται στις ινιακές-κροταφικές-βρεγματικές περιοχές του εγκεφάλου αναλύονται στο πεδίο του χρόνου (<20Hz) και στο συζευγμένο χρονοφασματικό πεδίο ευρυζωνικά (1-60Hz) με το συνεχή μετασχηματισμό του κυματίου που βελτιστοποιεί την πολυφασματική ανάλυση της υψίσυχνης (≥20Hz) γ-ταλαντωτικής δραστηριότητας. Αυτή η δοκιμασία οπτικογνωστικής κατηγοριοποίησης λαμβάνει χώρα τόσο σε νορμοξαιμικές όσο και υποξαιμικές συνθήκες (ελεγχόμενη μείωση στον κορεσμό του αίματος σε οξυγόνο από ≥97% γύρω στο 80% για 15 λεπτά κάτω από συνθήκες υποβαρικής υποξίας μέσα σε υποβαρικό θάλαμο), προκειμένου να ελέγξουμε ηλεκτροφυσιολογικούς δείκτες που μπορούν να ανιχνεύσουν και να συλλάβουν με τον πιο ευαίσθητο και δυναμικό τρόπο ακόμη και τόσο βραχύβιες και σχετικά ήπιες μεταβολές της εγκεφαλικής λειτουργίας. Η στατιστική παραμετρική ανάλυση των χρονοφασματικών χαρτών και η γενικευμένη, στατιστικά πιο ασφαλής, μέθοδος ανάλυσης των διακυμάνσεων ανέδειξαν ως πλέον ευαίσθητους και αξιόπιστους τους ακόλουθους δείκτες: τις κύριες αιχμές των προκλητών δυναμικών, τον παράγοντα φασικής συνάφειας των ταλαντώσεων μεταξύ των μοναδιαίων καταγραφών και την εκλυόμενη ενέργεια των προκλητών/φασικά-κλειδωμένων και επαγόμενων/ολικών ταλαντώσεων. Οι ηλεκτροφυσιολογικοί αυτοί δείκτες σε συνδυασμό με ψυχομετρικές δοκιμασίες επιτρέπουν τη διερεύνηση των σταδίων/επιπέδων κάμψης καθώς και των αποθεμάτων αντιρρόπησης των οπτικο-αντιληπτικών και γνωστικών-νοητικών λειτουργιών του εγκεφάλου για τον καθορισμό των λειτουργικών ουδών ευαισθησίας διάφορων εγκεφαλικών λειτουργιών στην υποξία. Ανοίγουν μάλιστα το δρόμο. για το λειτουργικό χαρακτηρισμό, τη διάγνωση και την παρακολούθηση εγκεφαλικών προσβολών ή άλλων οξέων και χρόνιων παθολογικών καταστάσεων του εγκεφάλου.