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At least 73 records · Page 4Linked to original sources
PubMed1984

The razor's edge: a dichotomy between monohedral and dihedral edge perception.

The "motion-induced contour" is seen in an image where a motion sequence specifies a dihedral edge. Five experiments examined the role of dihedral angle size in the perception of this illusory contour. Observers used free magnitude estimation of contour perceptibility; the data were analyzed by a repeated measures ANOVA and Newman-Keuls procedure. It was found that planar motion is the motion-induced contour in the "dihedral edges" where the dihedral angles are 45, 90, or 135 deg. However, the "monohedral edge," where the dihedral angle is zero, does not show a superiority of three-dimensional motion over planar motion. The difference between these two classes of edges is described in terms of ecological optics.

Form Perception↗
PubMed2006

Presence of Marteilia sp. (Paramyxea) in the razor clam Solen marginatus (Pennántt, 1777) in Galicia (NW Spain).

Protistan parasites of the genus Marteilia, phylum Paramyxea, cause the molluscs disease named Marteiliosis. Histological observations and transmission electron microscopy revealed the presence of life cycle stages of a Marteilia sp. in the bivalve mollusc Solen marginatus (Solenidae). Parasites occurred in epithelial cells of the digestive ducts and tubules. Early stages (primary cells) presented one or several nuclei while advances stages formed a complex of cells-within-cells (secondary and tertiary cells) culminating in spores. Refringent bodies were present inside the presporangia. This is the first report of a Marteilia sp. in S. marginatus.

Animals↗
PubMed2006

Germinoma in razor clam Ensis arcuatus (Jeffreys, 1865) in Galicia (NW Spain).

Germinoma is a gonadal neoplasm originating from progenitor cells in germinal epithelium. Over the last four decades it has been diagnosed in several species of marine bivalve molluscs but most consistently in some populations of Mercenaria mercenaria and Mya arenaria in North America. Tissue sections of gonads from Ensis arcuatus (family Pharidae--superfamily Solenacea), collected in Ría de Vigo (Galicia-NW Spain), revealed germinoma in both males and females. Proliferating, undifferentiated, germ cells, with no evidence of maturation, had formed discrete masses in the walls and lumens of gonadal follicles. This is the first report of germinoma in superfamily Solenacea.

Animals↗
PubMed1988

Spinal cord compression caused by dual pathology: a close shave with Ockham's razor.

A case of spinal cord compression in an oncology patient is presented. The compression was caused by minimal expansion of a vertebral body involved by a metastatic deposit impinging on a previously asymptomatic lipomatous spinal cord tumour. Nuclear magnetic resonance imaging clearly demonstrated both the vertebral metastasis and the intramedullary and extramedullary components of the lipomatous tumour in a single noninvasive investigation.

Aged↗
PubMedDate not supplied

Psychopathology: an edgeless razor?

The declining value of schneiderian first-rank symptoms (FRS) in differentiating between the two major functional psychoses has raised questions as to the utility of psychopathological concepts. In current diagnostic systems such as DSMs, psychopathological criteria and chiefly schneiderian symptoms have been used for nosographical purposes. It must be clear that this nosographically oriented use of psychopathology is only one aspect of the psychopathological enterprise. Indeed, while clinical psychopathology is essentially aimed at the identification of symptoms that are significant in view of nosographical distinctions, the specificendeavor of general psychopathology might be conceived as the organization of internal experiences around a core of meaningfulness, regardless of nosographical attributions. We seek to legitimate the value of psychopathological investigation and concepts as independent from any nosographical concern, and propose the concept of "psychopathological organizers" as synthesizing schemes of comprehension aimed at connecting different pathological experiences into unitary cores of meaningfulness.

Diagnosis, Differential↗
PubMed2000

Improving the clinical diagnosis of personal neglect: a reformulated comb and razor test.

Beschin and Robertson (1997) devised a simple clinical test of left personal neglect, which characterises personal grooming behaviour according to the proportion of the total activity that is directed to the left side of the body. Although this test proved highly reliable, and more sensitive than prior diagnostic techniques, its formulation may yet be improved. The present paper reports a reanalysis of Beschin and Robertson's (1997) data, using additional control subjects, and a formula which characterises personal neglect as a lateral bias of behaviour rather than as a lateralised deficit. It is shown that this formula greatly enhances the test's sensitivity to the behavioural abnormalities of brain damaged patients, and it is recommended that this modification be adopted for the future diagnosis of personal neglect.

Aged↗