The effects of peripheral and central fixation on a Poggendorff-like vernier alignment task

Wenderoth, Peter; White, Dennis; Beh, Helen C.

doi:10.3758/bf03204256

Cited by 13 publications

(3 citation statements)

References 14 publications

(21 reference statements)

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“…If we had found no P-bias in this condition, eccentricity would have been a plausible explanation. However, Wenderoth, White, and Beh (1978) have shown that there is little effect of fixation positions on the perceptual Poggendorff effect, and this agrees with our finding that there is still a P-bias in the FP3 condition.…”

Section: Resultssupporting

confidence: 92%

Saccades to Explicit and Virtual Features in the Poggendorff Figure Show Perceptual Biases

Dillenburger

Morgan

2017

i-Perception

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Human participants made saccadic eye movements to various features in a modified vertical Poggendorff figure, to measure errors in the location of key geometrical features. In one task, subjects (n = 8) made saccades to the vertex of the oblique T-intersection between a diagonal pointer and a vertical line. Results showed both a small tendency to shift the saccade toward the interior of the angle, and a larger bias in the direction of a shorter saccade path to the landing line. In a different kind of task (visual extrapolation), the same subjects fixated the tip of a 45° pointer and made a saccade to the implicit point of intersection between pointer and a distant vertical line. Results showed large errors in the saccade landing positions and the saccade polar angle, in the direction predicted from the perceptual Poggendorff bias. Further experiments manipulated the position of the fixation point relative to the implicit target, such that the Poggendorff bias would be in the opposite direction from a bias toward taking the shortest path to the landing line. The bias was still significant. We conclude that the Poggendorff bias in eye movements is in part due to the mislocation of visible target features but also to biases in planning a saccade to a virtual target across a gap. The latter kind of error comprises both a tendency to take the shortest path to the landing line, and a perceptual error that overestimates the vector component orthogonal to the gap.

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Section: Resultssupporting

confidence: 92%

Saccades to Explicit and Virtual Features in the Poggendorff Figure Show Perceptual Biases

Dillenburger

Morgan

2017

i-Perception

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“…6 caption. The figure attempts to illustrate the effect described by Wenderoth et al, (1978). The 45 deg pointer appears to point lower than the dot on the right (the P-bias) but to be collinear with the dot on the left.…”

Section: Experiments 13mentioning

confidence: 99%

Geometrical features underlying the perception of collinearity

Morgan

Dillenburger

2016

Vision Research

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This is the accepted version of the paper.This version of the publication may differ from the final published version. The magnitude of the Poggendorff bias in perceived collinearity was measured with a 2AFC task and roving pedestal, and was found to be in the region of 6-8 deg, within the range of previous estimates. Permanent repository link:Further measurements dissected the bias into several components:(

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“…Greist and Grier (1977) report that the Poggendorff illusion was unaffected by horizontal displacements, but it disappeared when the stimulus was vertically displaced from the centre of fixation. Wenderoth, White, and Beh (1978) however, could not replicate the latter effect, nor the finding of Novak (1966). It can be therefore said that there is mixedevidence that horizontal displacements of the Poggendorff display affect its strength as an illusion -from which it could be concluded that there is no reason to suspect that the angle-of-intersection biases of the slalom illusion, if indeed they share a similar root cause, would be affected.…”

Section: Effects Of Stimulus Eccentricitymentioning

confidence: 86%

An investigation into perceived motion paths by means of the Slalom Illusion

Gheorghes¹

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When a dot moves horizontally across a set of tilted lines of alternating orientations, the dot appears to be moving up and down along its trajectory. This perceptual phenomenon, known as the 'slalom illusion' (Cesaro & Agostini, 1998), reveals a mismatch between the veridical motion signals and the subjective percept of the motion trajectory which has not been comprehensively explained. In the context of the current thesis, the slalom illusion was used as a paradigm to investigate the integration of the brief and localised motion signals that are initially encoded by the visual cortex into the overall illusory

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The effects of peripheral and central fixation on a Poggendorff-like vernier alignment task

Cited by 13 publications

References 14 publications

Saccades to Explicit and Virtual Features in the Poggendorff Figure Show Perceptual Biases

Saccades to Explicit and Virtual Features in the Poggendorff Figure Show Perceptual Biases

Geometrical features underlying the perception of collinearity

An investigation into perceived motion paths by means of the Slalom Illusion

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