Suppression of color breakup in color-sequential multi-primary projection displays

2006 ◽  
Vol 14 (3) ◽  
pp. 325 ◽  
Author(s):  
Erno H. A. Langendijk ◽  
Stefan Swinkels ◽  
Dan Eliav ◽  
Moshe Ben-Chorin
Keyword(s):  
Primary Projection

scholarly journals An overlooked threatened species of eagle: Legge's Hawk Eagle Nisaetus kelaarti (Aves: Accipitriformes)

Zootaxa ◽  
2008 ◽  
Vol 1792 (1) ◽  
pp. 54 ◽  
Author(s):  
J. O. GJERSHAUG ◽  
O. H. DISERUD ◽  
P. C. RASMUSSEN ◽  
D. WARAKAGODA
Keyword(s):  
Genetic Differentiation ◽  
Threatened Species ◽  
Species Delimitation ◽  
Taxonomic Status ◽  
Sri Lankan ◽  
Moderate Degree ◽  
Cyt B ◽  
Conservation Measures ◽  
Primary Projection

Species delimitation is fundamental to many areas of biology, and in cases where taxonomic status has not been sufficiently clarified the ramifications can be as serious as extinction due to the failure to implement conservation measures. Since 1931, the Mountain Hawk Eagle Nisaetus (Spizaetus) nipalensis Hodgson has included the allopatric Sri Lankan and southern Indian taxon N. kelaarti (Legge) as a subspecies, and its taxonomic status has not been re-evaluated. We found that N. kelaarti differs considerably from N. nipalensis in its relatively much larger bill and claws and short primary projection, and that it also differs consistently in numerous plumage characters and other mensural characters. Its vocalizations differ distinctly, and an earlier study found a moderate degree of genetic differentiation (4.4% in cyt b and 3.1% in CR) from N. nipalensis. The available evidence thus strongly and unambiguously supports the specific distinctness of N. kelaarti.

47.3: Suppression of Color Breakup in Color-Sequential Multi-Primary Projection Displays

2005 ◽  
Vol 36 (1) ◽  
pp. 1510 ◽  
Author(s):  
Dan Eliav ◽  
Erno H. A. Langendijk ◽  
Stefan Swinkels ◽  
Itay Baruchi
Keyword(s):  
Primary Projection

Model for the retino-tectal projection

1983 ◽  
Vol 218 (1210) ◽  
pp. 77-93 ◽  
Keyword(s):  
Neural Pathways ◽  
Forming Mechanism ◽  
Receptor Kinetics ◽  
Retinal Axons ◽  
Additional Production ◽  
Compression And Expansion ◽  
Interaction Of Components ◽  
Pattern Forming ◽  
Primary Projection ◽  
Adhesive Forces

A model for the retino-tectal projection is proposed which assumes that axonal growth proceeds predominantly in the direction of maximal slope of a guiding substance (or, more generally, of a system parameter subsuming the effect of several substances). The spatial distribution of this parameter, in turn, results from the interaction of components of retinal axons (which are graded with respect to position of origin in the retina) and tectal components. One or two gradients in each dimension of retina and tectum suffice. Conditions for the generation of a reliable projection on this basis are relatively simple and consistent with conventional enzyme and receptor kinetics. Adhesive forces could but need not be involed in the guiding mechanism. The slope of guiding substances that interfere with an intracellular pattern-forming mechanism within the growth cone may determine the polarity of activation and thus the direction of growth. Generation of primary projections and some features of regulation such as independence of projections on neural pathways, and observations on the innervation of rotated pieces of tectum, can be explained on the basis of the model. The model can be extended by introducing additional production of guiding substance depending on the density, and duration of presence, of fibre terminals in the course of innervation. This simple mechanism would suffice for observed effects of compression and expansion of the map following ablation of retinal and tectal tissue, respectively. It may but need not be involved in the primary projection, too.

Three-Dimensional Imaging in Medicine: Holography

1986 ◽  
Vol 25 (01) ◽  
pp. 31-32 ◽  
Author(s):  
P. Heiss ◽  
W. Waters
Keyword(s):  
Nuclear Medicine ◽  
Three Dimensional ◽  
Projection Methods ◽  
Real Space ◽  
Three Dimensional Imaging ◽  
Surgical Units ◽  
Three Dimensional Display ◽  
Graphic Displays ◽  
Primary Projection

SummaryTwo holographic methods for three-dimensional imaging in medicine are presented. The methods can be applied on the base of various primary projection methods, especially those of nuclear medicine and roentgenology. This three-dimensional display, which is not bound to complicated technical equipments such as computers and graphic displays, can be performed easily at any place: in conference rooms, in surgical units etc. It may be of particular importance for the surgeon in order to visualize the site directly and in its real space dimensions.

Electrophysiologic Response Audiometry: State of the Art

1977 ◽  
Vol 42 (2) ◽  
pp. 179-198 ◽  
Author(s):  
Paul Skinner ◽  
Theodore J. Glattke
Keyword(s):  
Brain Stem ◽  
Clinical Utility ◽  
Diagnostic Value ◽  
Threshold Estimation ◽  
Cortical Projection ◽  
Latency Range ◽  
Latency Response ◽  
Probable Site ◽  
The Brain ◽  
Primary Projection

Electrophysiologic response audiometry (ERA) is based upon recording neuroelectric potentials from sites extending from the cochlea to the cortex. These recordings rely on the use of averaging computers to extricate desired neuroelectric responses from the ongoing background electrical activity of the human auditory system and brain. The different neuroelectric responses are distinguished by response latency, response waveform, and probable site of origin. Responses which occur within the latency range of 1 to 5 msec originate from the cochlea and auditory nerve. Responses in the 4- to 8-msec latency range have the brain stem as their origin. Responses with latencies from about 8 to 50 msec presumably arise from the upper brain stem and primary projection areas. Responses with a fast waveform include those with latencies between 1 and 50 msec. Slow wave responses from about 50 to 300 msec originate as a secondary discharge from the primary cortical projection areas and surrounding secondary and association areas. The longest latency potentials (300 msec) are slow shifts that appear to arise from the prefrontal and secondary or association areas of the cortex. These response classes are discussed in terms of their clinical utility for threshold estimation and diagnostic value.

A View from the Beginning of Magnetoencephalography

2020 ◽  
pp. 22-32
Author(s):  
Lloyd Kaufman
Keyword(s):  
Cerebral Cortex ◽  
Knowledge Base ◽  
Brain Tissue ◽  
Brain Surgery ◽  
Research Projects ◽  
Penetrating Wounds ◽  
Sensory Pathways ◽  
Potential Applications ◽  
Functional Areas ◽  
Primary Projection

This chapter examines the author’s work on visually evoked field (VEF) experiments. After their first VEF experiment, the author and other researchers thought that it may well be possible to use magnetoencephalography (MEG) to noninvasively map primary projection areas of several sensory pathways on the cerebral cortex. The importance of such a task lay partly in the fact that an enormous amount of information about these areas already existed. This information was gained in part by studying patients with penetrating wounds of their brains. Other studies applied electric stimuli during brain surgery to exposed brain tissue. Even if the researchers could not add anything of value to this knowledge base, they may still be able to verify MEG’s ostensible potential for locating specific functional areas noninvasively. Ultimately, this became one of the more valuable potential applications before brain surgery. The chapter then suggests some research projects that may accelerate progress in MEG.

Perimetric Study of Field Defects in Monkeys after Cortical and Retinal Ablations

1967 ◽  
Vol 19 (3) ◽  
pp. 232-245 ◽  
Author(s):  
Alan Cowey
Keyword(s):  
Visual Field ◽  
Histological Examination ◽  
Striate Cortex ◽  
Visual Field Defects ◽  
Projection Area ◽  
Central Scotoma ◽  
Eccentric Fixation ◽  
Field Defect ◽  
Primary Projection ◽  
Field Defects

Monocular visual field defects were studied in two monkeys. In one, the macular retina was destroyed by photocoagulation, producing a central scotoma and consistent 5° eccentric fixation. In a second animal the effects of removal of macular projection area in striate cortex and subsequent photocoagulation of the macula were compared. The cortical operation produced a partial field defect, i.e. a region of diminished sensitivity but not a scotoma, which became with practice much smaller than the region of retina whose primary projection area had been ablated. A 10° eccentric fixation was observed. Following the second, retinal, operation a macular scotoma was demonstrated whose size and position corresponded closely with the area of retinal destruction as determined by photography of the fundus and later histological examination of the retina.

scholarly journals A new genus of Theraphosid spider from Mexico, with a particular palpal bulb structure (Araneae, Theraphosidae, Theraphosinae)

2016 ◽  
Author(s):  
Jorge I. Mendoza ◽  
Arturo Locht ◽  
Radan Kaderka ◽  
Francisco Medina ◽  
Fernando Pérez-Miles
Keyword(s):  
New Species ◽  
New Genus ◽  
Central Area ◽  
New Combination ◽  
Adult Males ◽  
Apical Lobe ◽  
Three New Species ◽  
Long Ending ◽  
Primary Projection ◽  
Bulb Structure

Magnacarina gen. nov. from Mexico is described. Hapalopus aldanus West, 2000 from Nayarit, is transferred to the new genus with an emended diagnosis creating the new combination Magnacarina aldana comb. nov. Three new species are described: Magnacarina moderata Locht, Mendoza & Medina sp. nov. from Nayarit and Sinaloa; Magnacarina primaverensis Mendoza & Locht sp. nov. and Magnacarina cancer Mendoza & Locht sp. nov., both from Jalisco. Magnacarina gen. nov. is characterized by an unusual bifid palpal bulb, and has a primary projection located in the central area of the palpal bulb and directed retrolaterally; this projection possesses the prolateral superior and retrolateral keels. Next to the primary projection is a secondary projection, which may be short or long, ending in the prolateral inferior and apical keel surrounding the sperm pore. This secondary projection may have prolateral accessory keels and is diagnosed by possessing a nodule of inwardly curled megaspines, located in the basal ventro-retrolateral region of metatarsi I in adult males. Additionally, male tibiae I possess three apophyses. Females of Magnacarina gen. nov. have a single reduced and strongly sclerotized spermatheca, with an apical lobe projecting ventrally, and with a uterus externus that is longer and wider than the spermatheca.

Rhesus Monkey Vestibular Cortex: A Bimodal Primary Projection Field

Science ◽  
1971 ◽  
Vol 172 (3980) ◽  
pp. 280-281 ◽  
Author(s):  
D. W. F. Schwarz ◽  
J. M. Fredrickson
Keyword(s):  
Rhesus Monkey ◽  
Vestibular Cortex ◽  
Primary Projection ◽  
Projection Field
Sign in / Sign up

Export Citation Format

Share Document