Two experiments are described and appropriate discussion is given to illustrate the use of substoichiometry and saturation analysis techniques with undergraduates. The first experiment is the determination of silver content in photographic film. The second is the estimation of a hormone concentration using saturation analysis and a commercially…

Research on procedural justice has suggested that the distribution of control among participants can be used to classify dispute-resolution procedures and may be an important determinant of preference for such procedures. This experiment demonstrates that control can be meaningfully divided into two components: control over the presentation of…

According to the learned helplessness hypothesis, the learning impairment typically displayed by subjects previously given insoluble problems results from the real learning of response-outcome independence. This learning is represented as a belief in helplessness that interferes with the subsequent acquisition of adaptive responses. Two…

A five-week introductory unit on electricity, structured in a historical perspective provided by the letters of Ben Franklin, is described. (CP)

Presents classroom and laboratory teaching and demonstration ideas, including a demonstration of optical rotation, automatic potentiometric titration, preparation of radioactive lead, and an organic lab practical in library resources. (SL)

Actin and myosin have now been demonstrated to be important constituents of many eukaryotic cells. Their role is primarily that of a contractile system underlying all aspects of cellular motility. Described here is a simple experimental system to demonstrate quantitatively aspects of motility and its regulation in a slime mold. (Author/MA)

Describes a photochemistry experiment involving the quenching of uranyl luminescence by alcohols. (SL)

An experiment on the heat conductivity of different materials are described. Applications for energy education in the elementary classroom are implied. (MDR)

Presents a method for demonstrating Seebeck, Peltier, and Thomson effects in a single experiment. (SL)

Discusses the need of introducing corrections due to wire stiffness arising from end constraints and wire axis distribution curvature in the measurement of ac electrical frequency by exciting transverse standing waves in a stretched steel wire. (SL)

Presents an apparatus for demonstrating two-dimensional random motion suitable for illustrating molecular phenomena. Three specific uses are presented. (SL)

Sticks, string and observation start children off on the bare bones of human biology. (Editor)

The experiments reported here are aimed at exploring in more detail the possibility that context can improve perception itself. In particular, they are concerned with clarifying the conditions under which context might aid perception and with localizing the stage of processing at which context would have its effects. (Author)

These experiments were designed to assess the linguistic performance of the right hemisphere by using reaction time (RT) to measure the flow of information in the normal brain. RT to lateralized stimuli has proved to be a powerful tool for detecting functional differences between the hemispheres on a variety of cognitive tasks. (Author/RK)

Two free-recall experiments were performed in which the subjects were required to rehearse items an equal number of times, but the number of items presented at a given time was varied. The main hypothesis was that increasing the number of items presented at once would increase processing demands and decrease performance. (Editor)