The effects of imagery instructions on fifth-graders with differing abilities were examined through within-class analysis and analysis in which class effects were allowed to have influence. In the latter analysis there were significant Aptitude X Treatment interactions with subscores derived from paired-associate tasks. Interactions were…

Starting with laboratory research on the suppression of visualization in reading, this study investigates effects of treatments (reading vs. listening and pictures vs. no pictures, in a 2x2 design) and aptitudes on the learning of verbal and spatial types of content. Approximately 100 fifth grade pupils were given a battery of four ability tests,…

The Joreskog and Sorbom LISREL (linear structural relations) method is investigated as an alternative to regression analysis in studies of aptitude-treatment interactions (ATI), to solve problems caused by unreliability of measurements and by large sets of variables. A study reported by M.J. Behr is reanalyzed. This study investigated relations…