Search PubMed⌕ Search

Biomedical subjects

D C Hall

Publications and source records attributed to D C Hall.

At least 37 records · Page 2Linked to original sources
PubMed1977

Progress in manual breast examination.

Manual breast examination, despite recent advances in mechanical screening devices, remains a primary diagnostic procedure for early detection of breast cancer. The potential effectiveness of breast self-examination for reducing mortality relies on the effectiveness of a technology for training women to detect small tumors through manual palpation. Research indicates that although the regular practice of breast self-examination can lead to the detection of small tumors, current training methods are inadequate to ensure proper performance and maintain regular practice. An alternative interdisciplinary research and training approach, involving medicine, biomaterials engineering, psychophysics, and experimental psychology, is suggested. A dynamic lifelike breast model with variable lumps would provide the basis for generating systematic data regarding the factors affecting detection of small lumps and lead to development and evaluation of efficient and effective methods to teach manual examination.

Breast↗
PubMed1974

Motivation in concurrent variable-interval schedules with food and water reinforcers.

The lever pressing of four food- and water-deprived rats was reinforced on concurrent variable-interval schedules. Food reinforced one response, and water reinforced the other. Response rates in baseline were higher in the food component than in the water component. After response patterns and body weights had stabilized, the animals were given access to either food only, water only, both food and water, or neither food nor water (baseline) before daily sessions. Giving food before a session decreased per cent time in the food component, decreased overall response rates for food, and increased overall response rates for water. Giving water before a session increased per cent time in the food component, increased overall response rates for food, and decreased overall response rates for water. Giving both food and water before a session resulted in a combination of prefeeding and prewatering effects. More food and more water were consumed when both were available than when only one was available before a session.

Journal Article↗