Carrasco, M. Figueroa, Willen,
J.D. (1986). A test of the spatial-frequency explanation of the Muller-Lyer
illusion. Perception, 15: 553-562.
Previous investigations have shown that the response of spatial-frequency-specific
channels in the human visual system is differentailly affected by adaption
to gratings of distinct spatial frequencies and/or orientations. A study
is reported of the effecs of adaptation to vertical or horizontal gratings
of a high or a low spatial frequency on the extent of the Brentano form
of the Muller-Lyer illusion in human observers. It is shown that the illusion
decreases after adaptation to vertical gratings of low spatial frequency,
but seems unaffected otherwise. These results are consistent with the
notion of visual channels that are spatial-frequency and orientation specific,
and support the argument that the Muller-Lyer illusion may be due primarily
to lower-spatial-frequency components in the Fourier spectra of the image.