Quantifying the vestibulo-ocular reflex with video-oculography: nature and frequency of artifacts

Video-oculography devices are now used to quantify the vestibulo-ocular reflex (VOR) at the bedside using the head impulse test (HIT). Little is known about the impact of disruptive phenomena (e.g. corrective saccades, nystagmus, fixation losses, eye-blink artifacts) on quantitative VOR assessment in acute vertigo. This study systematically characterized the frequency, nature, and impact of artifacts on HIT VOR measures. From a prospective study of 26 patients with acute vestibular syndrome (16 vestibular neuritis, 10 stroke), we classified findings using a structured coding manual. Of 1,358 individual HIT traces, 72% had abnormal disruptive saccades, 44% had at least one artifact, and 42% were uninterpretable. Physicians using quantitative recording devices to measure head impulse VOR responses for clinical diagnosis should be aware of the potential impact of disruptive eye movements and measurement artifacts.

The nature and treatment of diseases of the ear

by William Kramer. Transl. from the German, with the latest improvements of the author since the last German ed. by James Risdon Bennett

Evaluation of the attack rates and level of damages by the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), affecting corn-crops in the northeast of Argentina

The fall armyworm (FAW) is the most important threat to corn crops in Argentina, and there exists very little up-to-date information on its actual pest status because the available literature was published more than 20 years ago. Therefore, field surveys were carried out in the northeast of Argentina, in order to establish the attack rates and injury levels of the pest in relation to the crop phenology. The study was carried out at two localities: Colonia Benítez, an agricultural region, and Tapenagá, a cattle-raising area. At each site two 1-ha plots were sown either with a Bt-corn expressing Cry 1F protein or with an untransformed corn germplasm. Optimal and late sowing was assayed and FAW larval abundance, relative age composition, attack rates and level of damage to corn were recorded. At the moment of the field experiments, Bt-corn was not affected by FAW larvae. However, untransformed germplasms were severely affected by FAW larvae, with an average of attacked plants of 18% or more. In contrast to data obtained 30 years ago, higher values of FAW density were registered. Levels of damage to corn plants were higher after the V4 stage. It was found that the sowing date affected the infestation levels and early seeding avoided high armyworm densities that develop later in the season; in northern Argentina, this was only relevant in agricultural areas.

An essay on the universal plentiude of being and on the nature and immortality of the human soul and its agency : manuscript, [1784]

Autograph manuscript, signed, with autograph manuscript revisions.

Alcohol safety program progress. Volume 1: nature and scope of the national program.

Mode of access: Internet.

A treatise of tenures, in two parts : containing I. The original, nature, use, and effect of feudal or common law tenures. II. Of custumary and copyhold tenures, explaining the nature and use of copyholds, and their particular customs, with respect to the duties of the lords, stewards, tenants, and suitors: with the nature of fines, forfeitures, hariots, escheats, descents, &c.

Spine title: Gilbert's tenures.

Nature and genesis of some storm washover deposits /

"December 1975."

Responsibility for crime : an investigation of the nature and causes of crime and a means of its prevention /

Mode of access: Internet.

The American citizen. A discourse on the nature and extent of our religious subjection to the government under which we live

Mode of access: Internet.

Physical optics or The nature and properties of light : a descriptive experimental treatise /

Mode of access: Internet.

An inquiry into the nature and causes of the wealth of nations /

On spine: The wealth of nations.

The nature and cures of fluxes : to which is added, the method of finding the doses of purging an vomiting medicines for every age /

Mode of access: Internet.