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At least 91 records · Page 5Linked to original sources
PubMed1992

The geographic structure of measles epidemics in the northeastern United States.

The incidence of disease across geographic space often produces distinctive regional patterns. In this paper, a modeling approach to the identification of the factors that shape the patterns is presented, and a procedure for fitting the model to observed data is given. The methodology is illustrated by an application to the geographic structure of measles epidemics among 22 states of the northeastern United States, New York City, and Washington, D.C., from 1962 to 1988. The patterns identified are interpreted in terms of the spatial behavior of measles epidemics in the region, and the implications of the methodology for surveillance and control are considered.

Humans↗
PubMed1992

Neural stimulation with magnetic fields: analysis of induced electric fields.

Spatial distributions of the derivative of the electric field induced in a planar semi-infinite tissue model by various current-carrying coils and their utility in neural stimulation are evaluated. Analytical expressions are obtained for the electric field and its spatial derivatives produced by an infinitely short current element. Fields and their derivatives for an arbitrarily shaped coil are then obtained by numerical summation of contributions from all the elements forming the coil. The simplicity of the solution and a very short computation time make this method particularly attractive for gaining a physical insight into the spatial behavior of the stimulating parameter and for the optimization of coils. Such analysis is useful as the first step before undertaking a more complex numerical analysis of a model more closely representing the tissue geometry and heterogeneity.

Computer Simulation↗
PubMed1976

Social behavior of the conilurine rodents (Muridae) of Australia.

This paper describes in detail the elements of social behaviour and social organizations of four closely related rodents (Notomys alexis, Pseudomys albocinereus, P. shortridgei and P. desertor) from diverse habitats, and the social organizations of seven other conilurine rodents are described briefly. Most of the data were determined from quantitative observations of animals caged in twos or in larger groups for at least ten days. Breeding pairs were observed daily throughout pregnancy and parenthood. A dispersed organization and three types of communal organization are described, and evolutionary trends in dispersion and territoriality, cohesion, communication and co-operation are discussed.

Agonistic Behavior↗
PubMed1976

Field studies on the African fruit bat Epomophorus wahlbergi (Sundevall), with special reference to male calling.

Social interactions, site attachment and group cohesion were studied in a free-living colony of Epomophorus fruit bats. Daily activites in an undisturbed colony were recorded. Special attention was paid to the peculiar calling behavior of courting male during the night. Structure and repetition rate of their sounds were analyzed in the laboratory. A special mode of acoustic interaction was found and related to the observed spacing out of calling males. By following feeding animals in the field and by analysis of their faeces we found that besides fruits they eat special leaves which afford steroidal sapogenins.

Animals↗
PubMed1976

Visual behaviour in social interaction: the validity of eye contact assessments under different conditions of observation.

On each session of the experiment, each of five subjects was assigned to act as either gaze-sender (GS), gaze-receiver (GR), direct-sight observer (DSO) TV observer (TVO) or one-way mirror observer (OWO). The GS had to look into the GR's eyes each time he received prerecorded signal through earphones. The GR and the three observers recorded GS's eye-gaze behaviour. Two conditions of distance between GR and GS were included. Results showed that (1) the GR, DSO and TVO presented an equivalent accuracy in their EC recordings as compared with the programmed signals, while the OWO's accuracy appeared significantly lesser; (2) as a concealed observer, OWO was also less efficient than TVO since the agreement of the former with GR's records was significantly lower than that of the DSO, which was not the case for the latter; (3) with increment of distance, OWOs recorded longer EC periods, a tendency which was not found significant among the other observers.

Eye Movements↗
PubMed1976

Ranging patterns of a troop of baboons (Papio anubis) in Kenya.

A troop of olive baboons, Papio anubis, was studied for 11 months in an open-country habitat near Gilgil, Kenya. Detailed mapping of troop movements was undertaken and provided a precise picture of range usage, showing that a small part of the range was used intensively. Gradations of home range use are described quantitatively. Tendencies to spread out and coalesce in different parts of the range are investigated. Shifting ranging patterns are examined together with meteorological factors, seasonal food supplies and water availability.

Age Factors↗