Biomedical subjects
Publications and source records attributed to T Jaeger.
Manipulations of contour lightness were shown to alter the magnitude and direction of the Delboeuf illusion. The data suggest that size detector rather than contour interactions create this visual anomaly.
For 30 undergraduates, brief exposures were shown to increase the apparent length of a line. This enhancement of length diminished as duration of exposure increased, creating an illusion of line length that resembles the Broca-Sulzer brightness anomaly.
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Müller-Lyer figures with outgoing fins were back illuminated and apparent shaft-length and depth were both judged by 20 undergraduates. With the angle between the fins constant, progressive increases in fin-length produced first an increase in the apparent shaft-length and then a decrease. Changes in fin-length, however, had no significant effect on apparent depth. These data were interpreted as inconsistent with an account of the Müller-Lyer illusion in terms of perspective theory, since the latter predicts systematic changes in perceived shaft-length to be associated with systematic changes in perceived depth.
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