ABSTRACT
The sensitivity of the individual to differences in orientation develops with age, and the general assumption is that the evolution occurs in two different directions according to whether the task involved is one of differentiation or of recognition. As far as most investigators are concerned, therefore, it appears that the difficulty of distinguishing between different orientations of the same form depends very much on the type of spatial transformation which is involved in moving from one to the other. Some of the contradictions apparent in the work of different authors concerning the relative precocity of discrimination between different orientations of the same form must be attributed to the non-equivalence of the tasks involved. Contrary to what had been suggested by earlier investigators concerned with the perception of orientation, children are aware from an early age of the differences in orientation of the same figure within a frame of reference.
