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Biomedical subjects

G Pellizzer

Publications and source records attributed to G Pellizzer.

6 recordsLinked to original sources
PubMed1992

Three-dimensional drawings in isometric conditions: planar segmentation of force trajectory.

Normal human subjects grasped an isometric handle with an unrestrained, pronated hand. They were asked to exert forces continuously to draw lemniscates (figure eights) in specified or self-chosen planes and in the presence or absence of a three-dimensional visual feedback cursor and a visual template. In every condition, the mean plane orientation in the force space differed appreciably between the two loops of the figure, as described previously by Soechting and Terzuolo (1987a) for free drawing arm movements. These findings suggest that the planar segmentation of the motor trajectory is not a consequence of joint motion but arises from central constraints related to the production of motor trajectory in space.

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PubMed1992

Three-dimensional drawings in isometric conditions: relation between geometry and kinematics.

Normal human subjects grasped a 3-D isometric handle with an otherwise unrestrained, pronated hand and exerted forces continuously to draw circles, ellipses and lemniscates (figure-eights) in specified planes in the presence or absence of a 3-D visual force-feedback cursor and a visual template. Under any of these conditions and in all subjects, a significant positive correlation was observed between the instantaneous curvature and angular velocity, and between the instantaneous radius of curvature and tangential velocity; that is, when the force trajectory was most curved, the tangential velocity was lowest. This finding is similar to that obtained by Viviani and Terzuolo (1982) for 2-D drawing arm movements and supports the notion that central constraints give rise to the relation between geometric and kinematic parameters of the trajectory.

Female↗
PubMed1992

Familial outbreak of agricultural anthrax in an area of northern Italy.

Three cases of cutaneous anthrax are reported which occurred in a farming family in northern Italy. Epidemiological studies revealed contact with an infected cow (delivery of a stillborn fetus and slaughter). The cow was slaughtered soon after the delivery; cultures of carcass specimens yielded growth of Bacillus anthracis. The origin of the animal infection was not known. Serum samples were obtained from all 11 members of the family group and randomly from 10 of the 75 cows on the farm, which appeared to be in good health. Tests for antibodies against protective antigen and lethal factor using EIA and Western blot techniques were positive in three subjects (in paired sera) with cutaneous anthrax and in one subject who neither had had direct contact with the infected cow nor showed any sign of anthrax.

Adult↗
PubMed1990

Expressed emotion and first-admission schizophrenia. Nine-month follow-up in a French cultural environment.

A study of 36 French-speaking families in Geneva identified 66% of high-EE household. At nine-month follow-up, the relapse rate for the high-EE group (33%) was significantly higher than for the low-EE group (0%). These results seem to confirm the relevance of EE as predictor of relapse. However, in our sample, it appears that one component of EE, critical comments, was principally responsible for the prognostic validity.

Adolescent↗
PubMed1988

Family expressed emotion and outcome of schizophrenics: a study in a French cultural environment.

This is the first attempt in a french cultural environment to relate family characteristics and expressed emotion to clinical course of schizophrenics. patients were studied during a two year period after their first or second hospital stay. Critical comments on subcategory of classical expressed emotion is associated with relapse, rehospitalization and work capacity but not with a broad measure of social activity.

Cultural Characteristics↗