Patterns were produced by randomly selecting lines from a 7-line matrix in the form of a block figure 8. "Four matrices were presented simultaneously and programmed to produce randomly selected patterns from the entire class. Some tests utilized a poststimulus cue which denoted only one of the four patterns for reproduction while other tests required reproduction of all four patterns. Performance was measured both in terms of line segments reproduced correctly, patterns reproduced correctly and amount of information perceived." Detailed analyses of these performance measures are reported. From Psyc Abstracts 36:01:1CL74K. (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1961 American Psychological Association.