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Biomedical subjects

N D Lerner

Publications and source records attributed to N D Lerner.

2 recordsLinked to original sources

Young children's ability to climb fences.

Three studies were performed to evaluate the fence-climbing abilities of children who are in the high-risk age group for drowning in residential pools. Study 1 examined the ability of children in the age range of 24 to 54 months to climb commonly used fences (common chain link, small chain link, picket, iron, and stockade) at a 4-ft (1.22-m) height. Study 2 examined children's abilities to climb fences retrofitted with features that would potentially make them more difficult to climb. Study 3 examined children's abilities to climb 5-ft (1.52-m) fences. Results of the three studies show that the common chain-link fence is easy to climb even by two-year-old toddlers. Other fence types offered more effective barriers, especially for younger children.

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Duration discrimination by rats.

A psychophysical procedure was used to determine the difference limen for the duration of a signal that ranged from .5 to 8.0 sec. The accuracy of three rats in keeping track of the duration was assumed to be limited by three factors: (a) inattention to the signal on some trials, (b) variability in starting to time the duration when the signal begins (and/or in stopping to time the duration when the signal ends), and (c) factors related to signal duration itself. A generalized Weber model provided a better approximation to the growth in the difference limen as a function of signal than a generalized Counter model.

Animals↗