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The location and retinotopic organization of visual areas in the cat cortex were determined by systematically mapping visual cortex in over 100 cats. The positions of the receptive fields of single neurons or small clusters of neurons were related to the locations of the corresponding recording sites in the cortex to determine the representations of the(More)
The location and retinotopic organization of areas 18 and 19 in cat cortex were determined using electrophysiological mapping techniques. These two areas each contain a single representation of the visual hemifield and each has a distinctive cytoarchitecture. The visual hemifield representations in these two areas are nearly mirror images of each other.(More)
This is the second in a series of papers in which we describe our continuing efforts to define functional units of visual cortex based upon electro-physiological mapping of single and multiple unit activity in both awake and the nitrous oxide anesthetized cats. In the first paper (Tusa, Palmer and Rosenquist, '78), the extent and retinotopic organization of(More)
The retinotopic organization of cat cortex, in the vicinity of areas 20 and 21 as defined by Heath and Jones ('71), was determined using electrophysiological mapping techniques. Although the topography of the visual field representations in this region of cortex is more complex than that found in areas 17, 18, and 19, this region appears to contain four(More)
OBJECTIVE The study was designed to measure dynamic visual acuity (DVA) during head movement as an assessment of the functional impact of vestibular deficits. STUDY DESIGN The study design was a prospective, clinical study. SETTING The study was performed in a tertiary, ambulatory referral center. PATIENTS Forty-two normal subjects, 29 patients with(More)
OBJECTIVE This study was designed to measure visual acuity during active vertical head movement and to examine its relationship to subjective reports of oscillopsia. STUDY DESIGN This was a prospective, clinical study. SETTING The study was performed in a tertiary, ambulatory referral center. PATIENTS Thirty normal subjects, 13 patients with(More)
Overview. Neurologists are frequently called upon to evaluate patients with vertigo and dizziness and, in some cases, to make sense of abnormal vestibular tests. Consequently, it is useful to have some familiarity with the methods used to test vestibular function. The vestibulo-ocular reflex (VOR) is a reflex that acts at short latency to generate eye(More)
We studied the role of the pretectal nucleus of the optic tract (NOT) in the development of monocular optokinetic nystagmus (OKN) asymmetries and latent nystagmus (LN) in two monkeys reared with binocular deprivation (BD) caused by binocular eyelid suture for either the first 25 or 55 days of life. Single-unit recordings were performed in the right and left(More)
The inferior longitudinal fasciculus is commonly considered to be a long association fiber bundle interconnecting the occipital and temporal lobes. Based on blunt dissections of human and monkey brains, we have found that the only long fiber bundle common to both the occipital and temporal lobes is the geniculostriate pathway (i.e., optic radiations),(More)
OBJECTIVE To describe the conversion of benign paroxysmal positional vertigo involving the posterior canal into benign paroxysmal positional vertigo involving the anterior or horizontal canals after treatment using the canalith repositioning maneuver. DESIGN Retrospective study of outcome. SETTING Outpatient clinic. PATIENTS Consecutive sample of 85(More)