465 research outputs found
Stolting Perfecscope stereoscopic viewer
No full textA perfecscope stereoscopic viewer which allows the user to view designs on paper cards in stereoscopic 3D. Also included is a collection of 11 paper cards which can be inserted into the perfecscope. It is also known as a Holmes-Bate type stereoscope. Writing on the top of the viewer reads: "Exposition Universelle Internationale 1900
Análisis de dos variables en la recuperación de información con humanos adultos jóvenes
No full text!e present study reports three experiments that examined the e"ect of retention interval and the presence of di"erential outcomes procedure (.#.) on the retrieval of information using a successive reversal discrimination paradigm with young human adults. Experiment one examined the e"ect of retention interval of ..h. In experiment two the e"ect of .#. on two phases of reversal discrimination was examined. Experiment three explored the e"ect of ..h retention interval and .#. in the spontaneous recovery of the original discrimination. Results of Experiment one showed the spontaneous reco- very of original discrimination with a ..h retention interval. Experiment two showed that .#. in phase one or two did not have e"ects on the learning reversal discrimination task. Experiment three observed an interaction of retention inter- val and .#.. !ese results suggest that the presence of the .#. generates conditioned expectancies about the stimulus reinforcer that can be a contextual-like cue that interacts with retention interval to modulate delayed retrieval of information.Se examino el efecto de dos variables en la recuperacion de informacion: el intervalo de retencion (�.) y el Procedimiento de Consecuencias Diferenciales (...) en una tarea de discri- minacion inversa en humanos adultos jovenes, en tres experi- mentos. En el primero, se estudio el efecto de un �. de ..h. En el segundo experimento, se examino el efecto del ... en las dos fases de una discriminacion inversa. En un tercer experimento, se investigo el efecto conjunto de un �. de ..h y del ... en las fases de adquisicion e inversion. En el experimento . los resulta- dos muestran la recuperacion espontanea despues de un IR de ..h. En el experimento ., se mostro que el ... no tiene efectos en las dos fases de una tarea de discriminacion inversa. En el experimento ., se observo una interaccion entre el �. y el .... Se sugiere que el ... genera expectativas acerca del reforza- dor que funcionan como senales en interaccion con el �. para producir una mayor o menor recuperacion de la informacion
Hydraulic external pre-isolator system for LIGO
No full textThe hydraulic external pre-isolator (HEPI) is the first six degrees of freedom active seismic isolation system implemented at the Laser Interferometer Gravitational Wave Observatory (LIGO). Implementation was first completed at the LIGO Livingston Observatory (LLO) prior to LIGOʼs fifth science run7, successfully cutting down the disturbance seen by LLOʼs suspended optics in the two most prominent seismic disturbance bands, the microseism (0.1–0.3 Hz) and the anthropogenic (1–3 Hz) bands, by a factor of a few to tens. The improvement in seismic isolation contributed directly to LLOʼs much improved duty cycle of 66.7% and LIGOʼs triple coincident duty cycle of 53%. We report the design, control scheme, and isolation performance of HEPI at LLO in this paper. Aided by this success, funding for incorporating HEPI into the LIGO Hanford Observatory was approved and installation is currently underway.S Wen, R Mittleman, K Mason, J Giaime, R Abbott, J Kern, B OʼReilly, R Bork, M Hammond, C Hardham, B Lantz, W Hua, D Coyne, G Traylor, H Overmier, T Evans, J Hanson, O Spjeld, M Macinnis, K Mailand, D Ottaway, D Sellers, K Carter and P Sari
Is there evidence of learned helplessness in horses?
No full textLearned helplessness can be defined as a psychological condition whereby individuals learn that they have no control over unpleasant or harmful conditions, that their actions are futile and that they are helpless. In a series of experiments in which dogs were exposed to inescapable shocks it was found that this lack of control subsequently interfered with the ability to learn an avoidance task. There is evidence that both neural adaptations and behavioural despair occur in response to uncontrollable aversive experiences in rodents, although this has yet to be demonstrated in other species such as horses. However, it has been suggested that certain traditional methods of horse training and some behavioral modification techniques may involve aversive conditions over which the horse has little or no control. When training and management procedures are repeatedly unpleasant for the horse and there is no clear association between behavior and outcome, this is likely to interfere with learning and performance, in addition to compromising welfare. This paper reviews published literature and anecdotal evidence to explore the possibility that the phenomenon learned helplessness occurs in the horse.<br/
Quality of poststressor rest influences the ulcerative process.
No full textIn: Behavioral neuroscience, vol. 101, nr. 2, pp. 246-253Onderzoeksbibliografie Frank OdbergHerkomst: Onderzoeksbibliografie van em. prof. dr. Frank O. Ödberg, verbonden aan de Vakgroep Voeding, Genetica en Ethologie van de Faculteit Diergeneeskund
Brief Reviews
No full textClinical Studies in Medical Biochemistry, edited by R.H. Glew and S.P. Peters. New York: Oxford University Press, 1987. 267 pp. 29.95.
Evolutionary Genetics, by John Maynard Smith. New York: Oxford University Press, 1989. 288 pp. 46.00.
Future Stuff, by M. Abrams and H. Bernstein. New York: Penguin Books, 1989. 301 pp. 25.95.
Human Biology and Behavior, 5th ed., by M. Weiss and A.E. Mann. Glenview, 111.: Scott, Foresman/Little, Brown, 1990. 678 pp. 16.95.
Humankind Emerging, 5th ed., by B.G. Campbell. Boston: Scott, Foresman, 1988. 552 pp. 45.00.
Human Reproductive Behavior: A Darwinian Perspective, edited by L. Betzig, M. Mulder, and P. Turke. New York: Cambridge University Press, 1988. 352 pp. 20.00.
Introduction to Physical Anthropology, 4th ed., by Harry Nelson and Robert Jurmain. New York and Los Angeles: West Publishing, 1988. 657 pp. 49.95.
Physical Anthropology, 4th ed., by P.L. Stein and B.M. Rowe. New York: McGraw-Hill, 1989. 512 pp. 31.25.
Population Genetics and Evolution, 2d ed., by L.E. Mettler, T.G. Gregg, and H.E. Schaffer. Englewood Cliffs, N.J.: Prentice-Hall, 1988. 325 pp. $24.00
A Physiological Role for Amyloid Beta Protein: Enhancement of Learning and Memory
No full textAmyloid beta protein (A[beta]) is well recognized as having a significant role in the pathogenesis of Alzheimer's disease (AD). The reason for the presence of A[beta] and its physiological role in non-disease states is not clear. In these studies, low doses of A[beta] enhanced memory retention in two memory tasks and enhanced acetylcholine production in the hippocampus _in vivo_. We then tested whether endogenous A[beta] has a role in learning and memory in young, cognitively intact mice by blocking endogenous A[beta] in healthy 2-month-old CD-1 mice. Blocking A[beta] with antibody to A[beta] or DFFVG (which blocks A[beta] binding) or decreasing A[beta] expression with an antisense directed at the A[beta] precursor APP all resulted in impaired learning in T-maze foot-shock avoidance. Finally, A[beta]1-42 facilitated induction and maintenance of long term potentiation in hippocampal slices, whereas antibodies to A[beta] inhibited hippocampal LTP. These results indicate that in normal healthy young animals the presence of A[beta] is important for learning and memory
Erratum: All-sky search for gravitational-wave bursts in the first joint LIGO-GEO-Virgo run (Physical Review D - Particles, Fields, Gravitation and Cosmology (2010) 81 (102001))
No full textThis paper was published online on 5 May 2010 with an omission in the Collaboration author list. S. Dwyer has been
added as of 12 April 2012. The Collaboration author list is incorrect in the printed version of the journal
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