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Biomedical subjects

H Cunningham

Publications and source records attributed to H Cunningham.

8 recordsLinked to original sources
PubMed1992

Extrapolation of linear motion.

We investigated observers' ability to extrapolate a linear trajectory of a moving point, in order to determine how effectively the visual system can combine orientation and position information for moving stimuli. Observers saw a probe dot moving along a straight line toward a stationary target dot. The probe dot extinguished before reaching the target, and the observers' task was to judge whether an extrapolation of the trajectory of the probe would pass to the left or right of the target. Performance was measured as a function of probe velocity, length of the visible trajectory, and location of the target. The empirical results indicated that over a range of conditions, performance on this task is qualitatively similar to, but somewhat less accurate than, that on an analogous task with static stimuli. A four-component model is presented to account for the results. The model specifies an accurate extraction of probe motion parameters, extrapolation of the motion by an ideal observer, and limitations on the input to these processes in the form of visual field spatial inhomogeneity and temporal decay of position information.

Depth Perception↗
PubMed1989

Metallothionein immunoreactivity in the liver and kidney of copper injected rats.

Adult male rats were injected intraperitoneally with copper sulphate in physiological saline (3 mg copper/kg body wt). Metallothionein-I (MT-I) levels in liver, kidney, plasma and red blood cells were measured by radioimmunoassay (RIA), prior to the injection and after 7, 16 and 24 h. Copper and zinc levels in liver and kidneys were also monitored. Concentrations of MT-I in liver and kidneys showed a rapid increase and remained elevated for 24 h. Copper concentrations also increased in both tissues but zinc levels remained constant in the kidney and rose only slightly in the liver. MT-I levels increased gradually in plasma but decreased in the red blood cells. Immunochemistry of liver and kidney, using the direct peroxidase technique with antiserum to rat MT-I, revealed an increase in staining in both tissues after copper administration, consistent with the RIA results. The change in distribution of immunoreactive material with time after copper injection indicates a role for MT in the sequestration and excretion of copper in acutely loaded animals.

Animals↗
PubMedDate not supplied

Developing teaching skills through individual consultation.

The authors, an educational specialist and a nursing instructor, describe their collaborative Teaching Consultation Process. They discuss the rationale for teaching development and the Teaching Consultation Process model. Finally, they highlight the impact of this model of consultation in nursing education.

Consultants↗
PubMedDate not supplied

A check on nurses' knowledge and sense of responsibility for discharge planning.

Nurse educators and managers have identified discharge planning as a critical step in the nursing process. Appropriate discharge planning has the potential to facilitate the patients' return to wellness and to provide a cost effective measure of health care. Staff nurses' and nurse administrators' knowledge of discharge planning is identified, as well as both groups' perceptions of the staff nurse responsibility relative to discharge planning. The results showed that staff nurses have significantly less knowledge than nurse administrators. A discharge planning program for implementation by staff development personnel is reported.

Administrative Personnel↗