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Topic: Theta (disambiguation)

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	Theta - Wikipedia, the free encyclopedia
		Theta (upper case Θ, lower case θ or ϑ) is the eighth letter of the Greek alphabet.
		According to Porphyry of Tyros, the Egyptians used an X within a circle as a symbol of the soul; having a value of nine, it was used as a symbol for Ennead.
		Theta was adopted into the early Cyrillic alphabet as fita (Ѳ, ѳ).
	en.wikipedia.org /wiki/Theta (379 words)

	OUP: Appendix 06 (Site not responding. Last check: 2007-10-10)
		Theta frequency in the 0.75 s immediately before each lever press did not increase as response rate increased during the fixed interval; indeed, towards the end of training it appeared to increase when response rate was lowest in the control animals.
		Cholinergic theta appears to be the result of the concurrence of an underlying phasic inhibitory input with input from the ascending cholinergic system which, even in its control of theta, involves a complex ‘reticulum’ of centres such as the pedunculopontine tegmental nucleus (PPT), superior colliculus, substantia nigra pars compacta, amygdala, and probably several more.
		It is almost certainly for this reason that the frequency of theta during ‘exploratory behaviour’ tends to be in the mid-point of the range in the rat, but near the lower end of the range in the cat, paralleling the different degrees of movement accompanying such behaviour in the two species.
	www.oup.co.uk /academic/medicine/medical_updates/neuropsych_anxiety/app06 (18641 words)

	Substream - hippocampus - models (Site not responding. Last check: 2007-10-10)
		In this two-stage model both exploratory (theta) and sharp wave states of the hippocampus are essential and any interference that might modify the structure of the population bursts (e.g., epileptic spikes) are detrimental to memory trace formation.
		Theta frequency inputs from the medial septum cause oscillations in the levels of GABA in the model, producing phasic changes in the strength of synaptic potentials during a theta cycle similar to those observed experimentally (Wyble et al., Soc Neurosci Abstr 1997;23: 197.7).
		A mechanism for parsing the theta rhythm into two epochs is proposed and simulated: in the first half, the strong, proximal input from the dentate to a subset of CA3 pyramidal cells and coincident, direct input from the entorhinal cortex to other pyramidal cells creates an environment for strengthening synapses between cells, thus encoding information.
	www.vankuyen.net /brain/more/hippocampus_(models).htm (13785 words)

	The Virtual Rat
		Theta modulation through GABA_B dynamics required conductances of 900, and the induction of spiking by afferent input during a low theta mode required a conductance of 1250 with $E=20$ mV, $T_[rise]=2$ ms and $T_{fall}=5$ ms.
		Theta modulation and transmission modulation (at afferent inputs and gamma input) in the PFC STM buffer is delayed by 164 ms (180 degrees out of phase with that of the EC STM buffer).
		Theta modulation of the synchronization populations on the input pathways to the PFC STM buffer is correspondingly delayed (56 ms on the goal input pathway and 62 ms on the place input pathway).
	askja.bu.edu /rak/extending-ratlab-model.html (20535 words)

	Substream - hippocampus - encoding (Site not responding. Last check: 2007-10-10)
		It is shown that the theta rhythm of the hippocampus consists of a regular component and an irregular one of high dimension which relation is in the wide variation depending on the state of the animal.
		It is concluded that the presence of hippocampal theta is not a sufficient condition to cause disturbances in auditory sensory gating.
		Based on the hypothesis that theta phase coding is generated by synchronization of neural activities, an autoassociative network model of the hippocampus and the entorhinal cortex was analyzed to explore mechanisms underlying episodic memory.
	www.vankuyen.net /brain/more/hippocampus_(encoding).htm (20034 words)

	Size of CA1-Evoked Synaptic Potentials Is Related to Theta Rhythm Phase in Rat Hippocampus -- Wyble et al. 83 (4): 2138 ...
		and correlates with theta in the entorhinal cortex (Alonso and
		Alonso, A., and Garcia-Austt, E. Neuronal sources of theta rhythm in the entorhinal cortex of the rat.
		Skaggs, W. McNaughton, B. Wilson, M. and Barnes, C. Theta phase precession in hippocampal neuronal populations and the compression of temporal sequences.
	jn.physiology.org /cgi/content/full/83/4/2138 (4665 words)

	Theta - Memory Alpha
		Theta class, a type of planetoid, such as Norcadia Prime.
		Theta, a Terran slave classification for the Alliance in the mirror universe.
		This is a disambiguation page; that is, one that points to other pages that might otherwise have the same name.
	www.memory-alpha.org /en/wiki/Theta (166 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		If there is a concept representative of the topic discussed in the word window and this con-cept is supposed to be meaningful for the disambiguation task, it shouldn't be too abstract or generic (as the concepts at higher levels usually are) in relationto the word senses being disambiguated.
		This measure compares correct disambiguations against all nouns in the collection;therefore, a system that is very precise but has a low coverage will also have a low recall overall.
		This results seems to indicate that the WSD algorithm is not performing as expected: the upper levels are used in the disambiguation, and thereforethe conceptual density measure is using conceptual relationships that are far too general to be meaningful for disambiguation.
	nlp.fi.muni.cz /projekty/wnportal/ps/txt/440838.txt (2860 words)

	All words on Sphere
		:''For other uses, see sphere (disambiguation).'' right A sphere is, roughly speaking, a ball-shaped object.
		In non-mathematical usage, the term sphere is often used for something "solid" (which mathematicians call ball).
		y = y_0 + r \\sin \\theta \\; \\sin \\phi \\qquad (0 \\leq \\theta \\leq \\pi \\mbox{ and } -\\pi
	www.allwords.org /sp/sphere.html (693 words)

	Computer Greeks (Site not responding. Last check: 2007-10-10)
		Herodotus says that the Athenians declared, before the battle of Plataea, that they would not go over to Mardonius, because in the first place, they were bound to avenge the burning of the Acropolis; and, secondly, they would not betray their fellow Greeks, to whom they were bound by
		The idea of being of Greek heritage was so common, a defining entry off of the disambiguation page seemed appropriate.Skeetch 04:11, Nov 5, 2003 (UTC) :It seems to me that anything linking here would be better served by a link to one of the other "Greek" pages.
		Generally, it's not to hard, as many entries are for Greek language (someone learnt it at school, or a word comes from it).
	www.wwwtln.com /finance/49/computer-greeks.html (929 words)

	Middle East Open Encyclopedia: Theta (Site not responding. Last check: 2007-10-10)
		This is an extract from The Middle East Open Encyclopedia, made possible through the Wikimedia Foundation.
		Iraq Museum International always displays the most recent published revision of the source article, Theta; all previous versions may be viewed here.
		They link directly to authoring tools for you to start writing a particular article.
	www.baghdadmuseum.org /ref/index.php?title=Theta (475 words)

	Greek alphabet - Wikipedia
		In west Greek, actually, chi was used for /ks/ and psi for /k_h/ - hence the value of our letter x, derived from chi.
		Over the middle ages these aspirates disappeared, so now theta, phi, and chi stand for /T/, /f/, and /x/.
		The origin of those letters is disputed: According to Miller (53), the Ψ-form kappa comes from the Proto-Canaanite.
	nostalgia.wikipedia.org /wiki/Eta (1120 words)

	Mao - the free encyclopedia (Site not responding. Last check: 2007-10-10)
		MAΘ, Mu Alpha Theta National Mathematics Honor Society
		disambiguation page — a navigational aid which lists other pages that might otherwise share the same title.
		If an article link referred you here, you might want to go back and fix it to point directly to the intended page.
	www.free-web-encyclopedia.com /?t=Mao (65 words)

	Neural Computation - Changes in GABAb Modulation During a Theta Cycle May Be Analogous to the Fall of Temperature ...
		We show that in the framework of Hopfield and Tank (1985), changes in GABAb suppression correspond to changes in the effective temperature and the relative energy of data terms and constraints of an analog network.
		These results suggest that phasic changes in the activity of inhibitory interneurons during a theta cycle mayproduce dynamics that resemble annealing.
		These dynamics may underlie a role for the theta cycle in improving sequence retrieval for spatial navigation.
	mitpress.mit.edu /catalog/item?ttype=6&tid=1580 (158 words)

	Summary list of publications:
		Hasselmo ME (2005) What is the function of hippocampal theta rhythm?--Linking behavioral data to phasic properties of field potential and unit recording data.
		Judge, S.J. and Hasselmo, M.E. (2004) Theta rhythmic stimulation of stratum lacunosum-moleculare in rat hippocampus contributes to associative LTP at a phase offset in stratum radiatum.
		Sohal, V.S. and Hasselmo, M.E. (1998) Changes in GABAB modulation during a theta cycle may be analogous to the fall of temperature during annealing.
	people.bu.edu /hasselmo/publications.html (2813 words)

	Changes in GABAB Modulation During a Theta Cycle May Be Analogous to the Fall of Temperature During Annealing -- Sohal ...
		Changes in GABAB Modulation During a Theta Cycle May Be Analogous to the Fall of Temperature During Annealing -- Sohal and Hasselmo 10 (4): 869 -- Neural Computation
		in the activity of inhibitory interneurons during a theta cycle mayproduce
		the theta cycle in improving sequence retrieval for spatial navigation.
	neco.mitpress.org /cgi/content/abstract/10/4/869 (189 words)

	All words on Orbit
		:''For other meanings of the term "orbit", see orbit (disambiguation) In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity.
		Orbits were first analysed mathematically by Kepler who formulated his results in his laws of planetary motion.
		The equation of the orbit described by the particle is thus: :
	www.allwords.org /or/orbit.html (2601 words)

	DEI lab. (Publications) (Site not responding. Last check: 2007-10-10)
		Yamaguchi Y, Aota Y, Sato N, Wagatsuma H, Wu Z, "Synchronization of neural oscillations as a possible mechanism underlying episodic memory: A study of theta rhythm in the hippocampus", Journal of Integrative Neuroscience Vol.
		Yamaguchi Y, "Hippocampal theta phase coding for integrative memory encoding and its participation in a global brain network", Gatsby Workshop on Theta Oscillations in the Brain: Neural Mechanisms and Functions, (Sep. 2004)
		Mizuhara H, Wang L, Kobayashi K, Yamaguchi Y, "Phase synchronization of scalp theta rhythm is associated with networking of positive and negative regional responses in a human mental task", 34th Annual Meeting of Society for Neuroscience (Neuroscience 2004), (Oct. 2004)
	dei.brain.riken.go.jp /pubs.html (1586 words)

	The Hippocampus and Disambiguation of Overlapping Sequences -- Agster et al. 22 (13): 5760 -- Journal of Neuroscience (Site not responding. Last check: 2007-10-10)
		The Hippocampus and Disambiguation of Overlapping Sequences -- Agster et al.
		Scores are shown for the final stage of preoperative training and in postoperative testing with minimal and 30 min delay before presentation of pair 5.
		highlighted the capacity of hippocampal circuits in sequence disambiguation for both spatial and nonspatial memory.
	www.jneurosci.org /cgi/content/full/22/13/5760 (6830 words)

	Theta Encyclopedia Article, Description, History and Biography @ LocalColorArtists.com (Site not responding. Last check: 2007-10-10)
		Looking For theta - Find theta and more at Lycos Search.
		Read product reviews and compare prices with tax and shipping from thousands of online stores.
		Find theta - Your relevant result is a click away!
	localcolorartists.com /encyclopedia/Theta (120 words)

	Citebase - The Measure of a Model
		These are part of any model formulation procedure, even if not broken out as separate steps, so the tradeoffs explored in this paper are relevant to a wide variety of methods.
		The measures are demonstrated in a large experiment, in which they are used to analyze the results of roughly 300 classifiers that perform word-sense disambiguation.
		Empirical studies on the disambiguation of cue phrases.
	www.citebase.org /cgi-bin/citations?id=oai:arXiv.org:cmp-lg/9604018 (540 words)

	Encoding and Retrieval in the CA3 Region of the Hippocampus: A Model of Theta-Phase Separation -- Kunec et al. 94 (1): ...
		are encoded and recovered during different parts of the theta
		During the second half of theta, cueing signals from the entorhinal
		Genetic dissection of theta rhythm heterogeneity in mice
	jn.physiology.org /cgi/content/abstract/94/1/70 (332 words)

	Orbit (Site not responding. Last check: 2007-10-10)
		For other meanings of the term "orbit", see orbit (disambiguation)
		In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity.
		The equation of the orbit described by the particle is thus:
	www.strictlymusic.com /search.php?title=Orbit (2476 words)

	Amber Gold (Site not responding. Last check: 2007-10-10)
		For other things called amber, see Amber (disambiguation).'' ---- thumb250pxAmber pendants.
		A notable use of AMBER is in the distributed computing project Folding@home where it was recently (as of October 15, 2004) in the simulation of protein folding.
		V_{(r^N)}=\sum_{bonds} \frac{1}{2} k_b (l-l_0)^2 + \sum_{angles} \frac{1}{2} k_a (\theta - \theta_0)^2 + \sum_{torsions} \frac{1}{2} V_n 1+cos(n \omega- \gamma) +\sum_{j=1} ^{N-1} \sum_{i=j+1} ^N \left\{4\epsilon_{i,j}\left\left(\frac{\sigma_{ij}}{r_{ij}} \right)^{12} - \left(\frac{\sigma_{ij}}{r_{ij}} \right)^6 \right+ \frac{q_iq_j}{4\pi \epsilon_0 r_ij}\right\}
	www.wwwtln.com /finance/7/amber-gold.html (1984 words)

	Kappa_ : Essential Information, explanation, recent texts, monographs, and relevant links. (Site not responding. Last check: 2007-10-10)
		The Sisters of Theta Phi Kappa by Kayla Perrin
		The Sisters of Theta Phi Kappa: A Novel by Kayla Perrin
		Physically it is a wooden box open at one side, and is most frequently used to measure potatoes for customers.
	www.asteroidwatch.net /primary/Mythology/Kappa_.html (303 words)

	Mao - Freepedia (Site not responding. Last check: 2007-10-10)
		Mao: The Unknown Story, a biography of Mao Zedong by Jung Chang and Jon Halliday published in 2005
		This is a disambiguation page, a list of pages that otherwise might share the same title.
		If an article link referred you to this title, you might want to go back and fix it to point directly to the intended page.
	en.freepedia.org /Mao.html (133 words)

	Neuroscience Wiki: HasselmoWallensteinHippocampalModel
		(Sohal and Hasselmo '98: Changes in GABA_B modulation during a theta cycle may be analogous to the fall of temperature during annealing)
		Changes in GABA_B modulation during a theta cycle may be analogous to the fall of temperature during annealing.
		GABA_B modulation improves sequence disambiguation in computational models of hippocampal region CA3.
	www.ifi.unizh.ch /~andel/neurowiki/nw.cgi?HasselmoWallensteinHippocampalModel (194 words)

	Memory Alpha:Links to disambiguating pages - Memory Alpha
		Memory Alpha:Links to disambiguating pages - Memory Alpha
		From Memory Alpha, the free Star Trek reference.
		Star Trek and related names are trademarks of Paramount Pictures, and are used under "fair use" guidelines.
	www.memory-alpha.org /en/wiki/Memory_Alpha:Links_to_disambiguating_pages (84 words)

	Citebase - Text Analysis Tools in Spoken Language Processing
		Choose tree size with mininum "honest" error rate.
		fflT oform sequence ofsubtrees, vary fffrom 0(for full tree) to 1 (for just root node) in:minT \Theta R (T)+ ffj Tj\Lambda:fflT oestimate "honest" error rate, test on data different from training data, e.g., gro wtree on 9=10 ofa vailable data and test on 1=10 ofdata repeating 10 times and averaging (cross-validation).
		K beha viors weights fflGeneralized transduction step:weighted transduction S:\Sigma \Lambda \Theta \Gamma \Lambda !
	www.citebase.org /cgi-bin/citations?id=oai:arXiv.org:cmp-lg/9406036 (1322 words)

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