Spatial Processing Characteristics in the Perception of Brief Visual Arrays
MICHIGAN UNIV ANN ARBOR HUMAN PERFORMANCE CENTER
Pagination or Media Count:
In the Estes and Taylor 1964, 1966 detection experiments, subjects Ss saw a brief array containing noise letters plus one of two critical letters, and attempted to determine which critical letter appeared accuracy decreased as the number of noise letters increased. This was interpreted by Estes and Taylor and by Rumelhart 1970 as demonstrating a limitation of perceptual capacity. However, the experiments involved confoundings stimulus arrays with more letters were either larger in visual angle or involved greater inter-letter crowding, both of which factors are known to decrease letter perceptibility. Experiments I and II in this study were patterned after the Estes and Taylor paradigm, but controlled both angular size and crowding factors by means of specially designed stimulus arrays. In both experiments, Ss performance decreased with increases in the number of letters, thus supporting limited-capacity models.