Bauhaus-Universität Weimar

Experimental Psychology: A Manual of Laboratory Practice, Vol. I: Qualitative Experiments, part 2: Instructor's Manual
Titchener, Edward B.
§ 46. Double Images 
(19) The two fingers, held out on the same line of vision, or 
two pegs on a metre stick, answer very well. The diagrams for 
double images of this kind are given in Figs. 55, 56. In the 
former, the fixation-point is constant, and the object varies its 
position ; in the latter, the object is constant and the fixation- 
O F 
Fig. 55. 
Fig. 56. 
point varies. Students who do not carry these diagrams ‘in 
their heads’ by visual memory are apt to be confused by the 
occurrence in books now of the one and now of the other figure. 
They may be helped by the mnemotechnic lines : 
Remote regard reverses ; 
Nearer notice, not. 
Remember that other diagrams are to be drawn, in which the 
non-corresponding points fall, not upon the two nasal or two 
temporal retinas, but upon the nasal side of the one and the 
temporal side of the other. 
It was a dogma of the older literature of physiological optics 
that double images are always seen in the plane of the fixation- 
point. Hering has insisted, and Helmholtz agrees, that double 
images are seen for the most part fairly accurately, i.e., in a 
plane not far removed from that of the object which gives rise


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