A visual illusion consisting of transparent halos extending beyond the boundaries of rotating discs is reported. The effect can be obtained by rotating a variety of black-and-white discs at moderate speeds. It is not due ...

A definition of reproducibility in Guttman Scaling and two chance measures of reproducibility are suggested. The first measure assumes that the items are independent. The second method assumes nonindependent items and fits ...

Recalls from five passages learned by undergraduates in the course of growing up in America were obtained. Unlike passages learned in the laboratory, the recalls, while partial, were exact with no evidence of constructive ...