Experiment I establishes that the ability to remember the slope of a line develops between three and four years of age. In Experiment II, 15 children with a mean age of four years and six months who had discriminated both slope and left-right problems under successive presentation were tested on these same discriminations under simultaneous…

In the first experiment, 16 kindergarten children were tested on vertical/horizontal and oblique discriminations in symmetrical and asymmetrical alignments. When stimuli were asymmetrically aligned, the former discrimination was learned as rapidly as the latter. The second experiment demonstrated that the influence of configurational cues in…