The ability to track moving objects is a crucial skill for performance in everyday spatial tasks. The tracking mechanism depends on representation of moving items as coherent entities, which follow the spatiotemporal constraints of objects in the world. In the present experiment, participants tracked 1 to 4 targets in a display of 8 identical…

This chartbook is designed as a graphic reference on national statistical information about disabilities. Each page contains a content question, explanatory text, and an explanatory chart or table as well as information on sources used. Key terms are shown in boldface and defined in a glossary. Section 1 provides demographic data on Americans with…

Illustrates, through text and graphs, that many striking variations are submerged beneath overall figures of poverty rates. The substantial differences in poverty rate according to race and ethnicity are, in large part, the consequences of major differences in family types and work situations. (SLD)

The first in a series of 53 publications designed to provide information relative to human service decision makers, this datebook constitutes a statistical summary of the socioeconomic problems of children and families with children in Pennsylvania's 67 counties. Data taken from the 1970 U.S. Census Report are presented via 24 tables, 15 figures,…