One can shear a pattern of lines to produce an anomalous contour which has a perceptual influence similar to that of a straight line segment. Illusion effects have been found with configurations which contain these anomalous contours, as well as cross adaptation with respect to luminance contours. We have found that sheared-line contours will bias judgment of collinearity, ie perceived alignment, of a luminance contour. The angular induction effects are similar to those reported for interactions between luminance contours, and the same equation can be used to model both kinds of data. The results of this experiment support the neuroreductionist view that anomalous and luminance contours are processed at the same level of the nervous system. Additionally, we suggest that with both types of contour the perceptual system registers and responds to the alignment of local brightness differentials.
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References
1.
BeckettP A, 1989“Illusion decrement and transfer of illusion decrement in real- and subjective-contour Poggendorff figures”Perception & Psychophysics45550–556
2.
BerlinerABerlinerS, 1948“The distortion of straight and curved lines in geometrical fields”American Journal of Psychology61153–166
3.
DayR HDickinsonR GJoryM K, 1977“The Poggendorff illusion with subjective contours”Quarterly Journal of Experimental Psychology29219–226
4.
FarneM, 1970“On the Poggendorff illusion: A note to Cumming's criticism of Chung Chiang's theory”Perception & Psychophysics8112
5.
GilbertC DWieselT N, 1985“Intrinsic connectivity and receptive field properties in visual cortex”Vision Research25365–374
6.
GreeneE, 1987“The relative contribution of contact and target lines in the magnitude of the Poggendorff effect”Perception16385–388
HallettP EHofmannM I, 1991“Segregation of some mesh-derived textures evaluated by free viewing”Vision Research311701–1716
14.
HalpernD FWarmJ S, 1980“The disappearance of real and subjective contours”Perception & Psychophysics28229–235
15.
HammondPAhmedB, 1985“Length summation of complex cells in cat striate cortex: A reappraisal of the ‘special/standard’ classification”Neuroscience15639–649
16.
HammondPMundenI M E, 1990“Areal influences on complex cells in cat striate cortex: Stimulus-specificity of width and length summation”Experimental Brain Research80135–147
17.
HenryG HGoodwinA WBishopP O, 1978“Spatial summation of responses in receptive fields of single cells in cat striate cortex”Experimental Brain Research32246–266
18.
von der HeydtRPeterhansE, 1989“Mechanisms of contour perception in monkey visual cortex I. Lines of pattern discontinuity”Journal of Neuroscience91731–1748
19.
HofmannF BBielschowskyA, 1909“Über die Einstellung der scheinbaren Horizontalen und Vertikalen bei Betrachtung eines von schrägen Konturen erfüllten Gesichtsfeldes”Archiv für die Gesamte Physiologie des Menschen und der Tiere126453–475
20.
KanizsaG, 1979Organization in Vision (New York: Praeger)
21.
MeyerG EGargesC, 1979“Subjective contours and the Poggendorff illusion”Perception & Psychophysics26302–304
22.
MeyerG EPetryS, 1987“Top-down and bottom-up: The illusory contour as a microcosm of issues in perception” in The Perception of Illusory Contours Eds PetrySMeyerG E (New York: Springer) pp 3–20
23.
NothdurftH C, 1990“Texton segregation by associated differences in global and local luminance distribution”Proceedings of the Royal Society of London Series B239295–320
24.
NothdurftH C, 1991a“Different effects from spatial frequency masking in texture segregation and texton detection tasks”Vision Research31299–320
25.
NothdurftH C, 1991b“Texture segmentation and pop-out from orientation contrast”Vision Research311073–1078
26.
OrbisonW D, 1939“Shape as a function of the vector-field”American Journal of Psychology5231–45
PeterhansEvon der HeydtR, 1989“Mechanisms of contour perception in monkey visual cortex II. Contours bridging gaps”Journal of Neuroscience91749–1763
29.
RediesCCrookJ MCreutzfeldtO D, 1986“Neuronal response to borders with and without luminance gradients in cat visual cortex and dorsal lateral geniculate nucleus”Experimental Brain Research61469–481
30.
SmithA TOverR, 1975“Tilt aftereffects with subjective contours”Nature (London)257581–582
31.
SmithA TOverR, 1979“Motion aftereffect with subjective contours”Perception & Psychophysics2595–98
32.
VogelsROrbanG A, 1987“Illusory contour orientation discrimination”Vision Research27453–467
33.
WundtW, 1893Grundzüge der Physiologischen Psychologie (Leipzig: Engelmann)
