An American text-book of physiology . Fig. 253.—To illustrate contrast in space-perception (Miiller-Lyer). and smaller in presence of a larger extension. This effect is illustrated inFigure 253, in which the middle portion of the shorter line appears largerthan the corresponding portion of the longer line, in Figure 254, in which asimilar effect is observed in the case of angles, and in Figure 255, in which 798 AN AMERICAN TEXT-BOOK OF PHYSIOLOGY. the space between the two squares seems smaller than that between the twooblong figures. In some case, however, an influence of the opposite sort se
An American text-book of physiology . Fig. 253.—To illustrate contrast in space-perception (Miiller-Lyer). and smaller in presence of a larger extension. This effect is illustrated inFigure 253, in which the middle portion of the shorter line appears largerthan the corresponding portion of the longer line, in Figure 254, in which asimilar effect is observed in the case of angles, and in Figure 255, in which 798 AN AMERICAN TEXT-BOOK OF PHYSIOLOGY. the space between the two squares seems smaller than that between the twooblong figures. In some case, however, an influence of the opposite sort seems to be. Fig. 254.—To illustrate contrast in space-perception (Miiller-Lyer). exerted, as is shown in Figure 256, in which the middle one of three parallellines seems longer when the outside lines are longer, and shorter when theyare shorter than it is itself, and in Figure 257, where a circle appears larger Fig. 255.—To illustrate contrast in space-perception (Miiller-Lyer). if surrounded by a circle larger than itself, and smaller if a smaller circle isshown concentrically within it. Lines meeting at an angle appear longer when the included angle is large Fig. 256.—To illustrate so-called confluxion in space-perception (Miiller-Lyer). than when it is small, as is shown in Figure 258. This influence of theincluded angle aflx)rds a partial explanation of the illusion shown in Figure259, where the horizontal line at B seems longer than at A ; but the distance ^ For this influence the name confluxion has been proposed by Miiller-Lyer, from whosearticle in the Archivfiir Phyaiologie, 1889,
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