hemifield

hemifield

One half of the visual field, usually divided vertically through the fovea into the left or the right visual field. It occurs following transection of the optic chiasma. Hemifield neglect sometimes occurs following trauma to the posterior lobe of one hemisphere. See visual neglect.
References in periodicals archive ?
In some cases, the impairment may be limited to a single hemifield, in which case it is termed 'hemidyschromatopia.
Nine eyes had generalized depression of the visual field, 2 had superotemporal quadrantanopsia, 1 had superior and inferior arcuate defect, 1 had depression in the nasal quadrant, and 5 had inferior hemifield defect.
Visual field loss was defined as glaucoma hemifield test result outside the normal limits and three points abnormal at the 5% level in one hemifield on the pattern deviation plot of a Humphrey Visual Field Analyzer.
In the right hemifield, the proportion of white noise decreased and that of pink noise increased, reaching equal levels at 90 degrees (see Figure 1).
5% of the infants had hemifield asymmetry of 20 degrees or more.
7 and/or neuroretinal rim narrowing) with associated visual field defect on automated perimetry (Swedish interactive thresholding algorithm standard 24-2 program; Humphrey field analyzer II 750i; Carl Zeiss Meditee) if the following were found: (1) glaucoma hemifield test results outside normal limits; (2) a cluster of 3 or more nonedge, contiguous points on the pattern deviation plot, not crossing the horizontal meridian with less than a 5% probability of being present in age-matched healthy individuals (one of which was <1%); and (3) pattern standard deviation less than 0.
Muller, "Sustained division of spatial attention to multiple locations within one hemifield," Neuroscience Letters, vol.
a cluster of three points (excluding rim area) with a probability of <5% on a pattern deviation map in at least one hemifield and comprising at least one point with a probability of <1%;
Zwiers et al [20] performed a series of sound localization experiments that studied the sound localization accuracy in the 2D hemifield of two groups of both sighted and early-blind subjects.
More distinct auditory ERPs with N1 deflections were again obtained to auditory stimuli applied to the right hemifield (C3: -1.