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Topic: Temporal resolution


In the News (Fri 17 Feb 12)

  
  Webvision: Temporal Resolution
Temporal summation is also affected by other test variables such as background luminance and the size of the stimulus size.
An important aspect of cone vision is that when the short-wavelength pathway is isolated (Kelly, 1974), the temporal resolution is lower, close to 10-15 Hz, rather than the closer to 60 Hz for the longer wavelength pathways.
Temporal resolution is not as efficient at low luminances (scotopic vision).
webvision.med.utah.edu /temporal.html   (2650 words)

  
 Satellites and sensors - Temporal Resolution
In addition to spatial, spectral, and radiometric resolution, the concept of temporal resolution is also important to consider in a remote sensing system.
Therefore the absolute temporal resolution of a remote sensing system to image the exact same area at the same viewing angle a second time is equal to this period.
Thus, the actual temporal resolution of a sensor depends on a variety of factors, including the satellite/sensor capabilities, the swath overlap, and latitude.
www.ccrs.nrcan.gc.ca /resource/tutor/fundam/chapter2/06_e.php   (403 words)

  
 Clausal Temporal Resolution
Temporal logic is a variety of non-classical logic that was originally developed in order to represent tense in natural language.
She has been responsible for key advances in these areas, particularly the development of effective loop search algorithms in temporal resolution and the extension of clausal resolution to temporal logics of knowledge.
He has been responsible for key advances in temporal logics, such as the introduction of the clausal temporal resolution approach, and the development of a variety of expressive executable temporal logics.
www.csc.liv.ac.uk /~clare/ijcar/ijcar01.html   (649 words)

  
 RangeView: Temporal Resolution   (Site not responding. Last check: 2007-10-08)
Temporal resolution is defined as the frequency at which images are recorded/captured in a specific place on the earth.
The more frequently it is captured, the better or finer the temporal resolution is said to be.
Temporal resolution can be very important when choosing imagery.
rangeview.arizona.edu /glossary/tempres.html   (166 words)

  
 4aPP9. Simulations of temporal resolution and integration data with a computer model using a modulation filter bank.   (Site not responding. Last check: 2007-10-08)
Simulations of temporal resolution and integration data with a computer model using a modulation filter bank.
Temporal resolution and temporal integration in the auditory system, with their conflicting time constants, are often regarded as paradox phenomena.
In this study a model is presented for the simulation of a number of temporal resolution experiments (e.g., gap detection, forward masking) and classical test tone integration data (cf.
www.auditory.org /asamtgs/asa96ind/4aPP/4aPP9.html   (208 words)

  
 Temporal Resolution   (Site not responding. Last check: 2007-10-08)
The development of CT scanners was motivated, to a major degree, by the need for better temporal resolution.
The primary indicator of temporal resolution is the period of data acquisition, although the temporal resolution also depends on the reconstruction algorithm.
A trade-off between temporal resolution and low-contrast resolution depends upon the intended application of CT images.
dolphin.radiology.uiowa.edu /ge/Teaching/ct/node16.html   (206 words)

  
 Resolution at opensource encyclopedia   (Site not responding. Last check: 2007-10-08)
Resolution (law), an action taken by a legislative body
Angular resolution, the capability of an optical sensor to discern small objects
Sensor resolution, the precision of a quantitative sensor
wiki.tatet.com /Resolution.html   (132 words)

  
 Journal of Vision - The effects of spatial attention on temporal resolution, by Yeshurun & Levy
Purpose: To better understand the temporal component of visual perception by studying the effects of spatial attention on temporal resolution.
However, the pattern of these attentional effects on temporal resolution depended on the eccentricity at which the target appeared.
Moreover, the pattern of these effects on temporal resolution depends on the spatial position of the temporal target, and may, therefore, be a product of the attentional effects on spatial resolution.
www.journalofvision.com /1/3/70   (345 words)

  
 Research interests Rens Kortmann
Figure 3 shows curves we measured, along which spatial and temporal resolution (represented by Delta phi and Delta t respectively) can be traded in our experimental set-up, while the two selected factors (forces, see figure 1) remain constant.
Temporal resolution is modelled through the integration time of the neurons sampling from the photoreceptors.
Curves along which spatial and temporal resolution (represented by Delta phi and Delta t respectively) can be traded in our experimental set-up, while the two forces (see figure 1) remain constant.
www.cs.unimaas.nl /~Kortmann/trade-off.html   (396 words)

  
 Journal of Vision - Perceptual binding of letters into words is low temporal resolution, by Holcombe
METHODS: To measure the temporal resolution of binding letters into words, in each trial two four-letter strings alternated in the same location for several cycles.
RESULTS: Temporal frequency thresholds were remarkably poor for each subject, ranging from 5 Hz (100 ms/word) to as low as 2 Hz (250 ms/word).
CONCLUSIONS: The low temporal resolution of binding letters into words indicates that decades of training is not sufficient for high-resolution access to stimulus information.
www.journalofvision.com /3/9/185   (336 words)

  
 MRI
With computer simulations of the CT scanning and image reconstruction process, relations between desired temporal resolution and number of required rotations were calculated for varying parameters like heart rate and scanner rotation speed.
This corresponds to a temporal resolution of 200 ms found in the simulations.
Cardiac images with high temporal resolution can be obtained using retrospective cardiac gating with a standard sub-second CT scanner.
www.dkfz-heidelberg.de /mrphys/heart/ct/ekgct.html   (407 words)

  
 On-line optical imaging of the human brain with 160-ms temporal resolution
We have developed an instrument for non-invasive optical imaging of the human brain that produces on-line images with a temporal resolution of 160 ms.
The imaged quantities are the temporal changes in cerebral oxy-hemoglobin and deoxy-hemoglobin concentrations.
This approach to optical brain imaging is a powerful tool for the investigation of the spatial and temporal features of the optical signals collected on the brain.
www.opticsexpress.org /oearchive/source/18957.htm   (1052 words)

  
 Journal of Vision - Perceptual binding of letters into words is low temporal resolution, by Holcombe
METHODS: To measure the temporal resolution of binding letters into words, in each trial two four-letter strings alternated in the same location for several cycles.
RESULTS: Temporal frequency thresholds were remarkably poor for each subject, ranging from 5 Hz (100 ms/word) to as low as 2 Hz (250 ms/word).
CONCLUSIONS: The low temporal resolution of binding letters into words indicates that decades of training is not sufficient for high-resolution access to stimulus information.
journalofvision.org /3/9/185   (336 words)

  
 YMEC software - ANALYSIS OF HEARTBEAT WITH HIGH TEMPORAL RESOLUTION - Heartbeat measurement 7
Since I wrote this measurement report, I learned that the cerebral infarction is caused by the heart disease, especially the heart failure.
As a high temporal resolution, heartbeat was analyzed with the integration time of 2 ms and the maximum time delay of 20 ms in Heartbeat measurement 3.
Because the integration time (analysis time length) is quite small, the frequency resolution is very poor.
www.ymec.com /hp/signal2/heart7.htm   (845 words)

  
 " + subject_header + "   (Site not responding. Last check: 2007-10-08)
Such a capability is essential for a system-level understanding those human brain functions that possess unique attributes and cannot be investigated with the invasive techniques employed in animal model studies.
Project 1 focuses on examining three issues critical to fMRI; (i) the physiological basis of fMRI signals, (ii) spatial resolution, and (iii) temporal resolution.
With the proposed improvement in fMRI temporal resolution, subsecond temporal resolution of cortical columns can be obtained.
neurovia.umn.edu /incweb/p1/home.html   (355 words)

  
 Analysis of high temporal resolution spectra of late-type rapid rotator stars   (Site not responding. Last check: 2007-10-08)
In this contribution we present the results of high temporal resolution spectroscopic observations of a sample of active stars.
High resolution echelle spectra have been obtained in February 2004 using SOFIN spectrograph at 2.56m Nordic Optical Telescope (NOT, La Palma) and in April 2004 at FOCES spectrograph in 2.2m Telescope in Calar Alto Observatory.
From the equivalent width and radial velocity variation with rotational phase of the star it's possible to detect the presence of prominence-like clouds (dense and cool material embedded in the hotter stellar corona).
www.hs.uni-hamburg.de /cs13/abstract198.html   (209 words)

  
 Temporal Properties of Chronic Cochlear Electrical Stimulation Determine Temporal Resolution of Neurons in Cat Inferior ...
Temporal Properties of Chronic Cochlear Electrical Stimulation Determine Temporal Resolution of Neurons in Cat Inferior Colliculus -- Vollmer et al.
Temporal Properties of Chronic Cochlear Electrical Stimulation Determine Temporal Resolution of Neurons in Cat Inferior Colliculus.
Degradation of Temporal Resolution in the Auditory Midbrain After Prolonged Deafness Is Reversed by Electrical Stimulation of the Cochlea
jn.physiology.org /cgi/content/abstract/82/6/2883   (521 words)

  
 Temporal Properties of Chronic Cochlear Electrical Stimulation Determine Temporal Resolution of Neurons in Cat Inferior ...
In the present study, the responses of 676 single neurons to pulse trains of increasing frequencies were recorded in the IC of 29 cats.
The results suggest that there are characteristic differences in the temporal resolution between neurons in the ICX and ICC.
The ability to encode and resolve the temporal patterns of the electrical signal is crucial for the speech recognition performance
jn.physiology.org /cgi/content/full/82/6/2883   (9282 words)

  
 MICROSTRATIGRAPHY OF AN AMALAGAMATED STORM BED: SPATIO-TEMPORAL RESOLUTION IN THE FOSSIL RECORD   (Site not responding. Last check: 2007-10-08)
Studies of modern storm processes indicate that post-mortem transport of benthic marine organisms is often negligible, suggesting that subfossil death assemblages may commonly preserve spatial community structure with good fidelity, albeit time-averaged.
To test the implication that the same fidelity is to be expected in ancient assemblages, the Upper Ordovician strata of the type Cincinnatian provide highly fossiliferous, laterally extensive outcrops that are ideally suited for assessing fine-scale spatial and temporal patterns in a storm-dominated setting.
In this investigation, we analyzed spatial and microstratigraphic patterns of fossil distribution preserved in an amalgamated, multi-event Cincinnatian horizon that is traceable for a lateral distance of some 60 km.
gsa.confex.com /gsa/2002AM/finalprogram/abstract_44144.htm   (486 words)

  
 5.41 Temporal Resolution   (Site not responding. Last check: 2007-10-08)
For example, to use a resolution of one second simply requires update of a few lines of the database creation code and some changes to the menus to display the extra fields.
A resolution of one second, which would require fourteen digits using the 'yyyymmddhhmmss' format, might be more useful in keeping with the TGIS generic toolkit approach.
The latter solution will use more disk space; some comparative but approximate disk space consumption figures for a temporal resolution of one day and one second are given in table 5.2.
giswww1.bcit.ca /jcandy/thesis/s5.41.html   (409 words)

  
 News & Features: Using computational methods to analyse auditory signal transduction and processing
Likewise, the temporal resolution of most stimulus—response trials is far too imprecise to analyze processing at the sub-millisecond level.
With this approach, Gollisch and Herz disentangled individual steps of two consecutive integration processes—which they conclude are the mechanical resonance of the eardrum and the electrical integration of the receptor neuron—down to the microsecond level.
Surprisingly, this fine temporal resolution is achieved even though the neuron's action potentials jitter by about one millisecond.
www.iscid.org /boards/ubb-get_topic-f-1-t-000228.html   (697 words)

  
 Mechanising First-Order Temporal Resolution - Konev, Degtyarev, Dixon, Fisher, Hustadt (ResearchIndex)   (Site not responding. Last check: 2007-10-08)
Abstract: First-order temporal logic is a concise and powerful notation, with many potential applications in both Computer Science and Artificial Intelligence.
While the full logic is highly complex, recent work on monodic first-order temporal logics has identified important enumerable and even decidable fragments.
2 A temporal resolution prover (context) - Hustadt, Konev - 2003
citeseer.lcs.mit.edu /konev03mechanising.html   (586 words)

  
 EURASIP Journal on Applied Signal Processing   (Site not responding. Last check: 2007-10-08)
Spatial compression artifacts arise as a result of quantization of the transform-domain coefficients, and are often manifested as blocking and ringing artifacts.
Temporal limitations in compressed video occur when the encoder, in an effort to reduce bandwidth, drops frames.
The Bayesian formulation of the restoration prevents spatial compression artifacts in the received frames from propagating to the reconstructed frames.
www.hindawi.com /journals/asp/volume-2001/S1110865701000269.html   (145 words)

  
 Strategies for Temporal Resolution - Dixon (ResearchIndex)   (Site not responding. Last check: 2007-10-08)
Abstract: Verifying that a temporal logic specification satisfies a temporal property requires some form of theorem proving.
In this thesis the algorithms for, and strategies to guide, a fully automated temporal resolution theorem prover are given, proved correct and evaluated.
While we do not consider the implementation of the resolution method here, we expect that several of the successful algorithms from...
citeseer.ist.psu.edu /dixon95strategie.html   (1495 words)

  
 1.6 Temporal Resolution   (Site not responding. Last check: 2007-10-08)
The spatial resolution depends upon how close together the x, y,z values are collected to satisfactorily describe the object's shape and the temporal resolution depends upon how often the shape is re-measured.
The temporal resolution requirement varies tremendously over different scientific disciplines.
For example, the results of a survey by Ris (1991) show that a group of scientists agreed that time was as important as space in their disciplines, but some geologists used time steps in millions of years and meteorologists use time steps in minutes.
giswww1.bcit.ca /jcandy/thesis/s1.6.html   (266 words)

  
 Temporal Resolution   (Site not responding. Last check: 2007-10-08)
Timing is derived from chain of image tube, photomultiplier, constant fraction discriminator and time-to-digital converter;
Reported time resolutions [Amitay] are 80 - 170 ps, varying with flux (!);
Main contribution to timing error is residual walk in constant fraction discriminator; (remember we are dealing in trillionths of a second);
wwwrsphysse.anu.edu.au /~ehr121/seminar2/sld021.htm   (63 words)

  
 Dynamic Perfusion CT: Optimizing the Temporal Resolution and Contrast Volume for Calculation of Perfusion CT Parameters ...
Dynamic Perfusion CT: Optimizing the Temporal Resolution and Contrast Volume for Calculation of Perfusion CT Parameters in Stroke Patients -- Wintermark et al.
Dynamic Perfusion CT: Optimizing the Temporal Resolution and Contrast Volume for Calculation of Perfusion CT Parameters in Stroke Patients
temporal sampling rate and the volume of contrast material.
www.ajnr.org /cgi/content/abstract/25/5/720   (472 words)

  
 The intracellular Ca2+ transient and tension in frog skeletal muscle fibres measured with high temporal resolution -- ...
The intracellular Ca2+ transient and tension in frog skeletal muscle fibres measured with high temporal resolution -- Claflin et al.
The intracellular Ca2+ transient and tension in frog skeletal muscle fibres measured with high temporal resolution
The purpose of this study was to determine, with high temporal
jp.physoc.org /cgi/content/abstract/475/2/319   (389 words)

  
 Resolution   (Site not responding. Last check: 2007-10-08)
Resolution (law), an action taken by a deliberative body, usually a legislature
Injective resolutions, projective resolutionss, free resolutions and exact resolutions are certain series in mathematics
If we did all the things we are capable of, we would literally astound ourselves.
www.brainyencyclopedia.com /encyclopedia/r/re/resolution.html   (116 words)

  
 Hearing and Speech Sciences
Principal Investigator on MERIT Award from the National Institute on Aging, entitled, Auditory temporal processes, speech perception and aging (2002 - 2007).
This finding supports the hypothesis that aging is accompanied by changes in processing the temporal characteristics of acoustic stimuli, and that these temporal processing problems contribute to the speech perception problems of elderly listeners in degraded acoustic environments.
Recent work also suggests that for speeded speech, the primary problem for older listeners is recognizing brief, impoverished acoustic cues in consonants, rather than the limited processing time to identify an entire sentence.
www.bsos.umd.edu /hesp/facultyStaff/salants.htm   (852 words)

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