Straightness as the Main Factor of the Hermann Grid Illusion

  title={Straightness as the Main Factor of the Hermann Grid Illusion},
  author={J{\'a}nos Geier and L{\'a}szl{\'o} Bern{\'a}th and Mariann Hud{\'a}k and L{\'a}szl{\'o} S{\'e}ra},
  pages={651 - 665}
The generally accepted explanation of the Hermann grid illusion is Baumgartner's hypothesis that the illusory effect is generated by the response of retinal ganglion cells with concentric ON–OFF or OFF–ON receptive fields. To challenge this explanation, we have introduced some simple distortions to the grid lines which make the illusion disappear totally, while all preconditions of Baumgartner's hypothesis remain unchanged. To analyse the behaviour of the new versions of the grid, we carried… 

Figures from this paper

Experimental Observations of the Visibility Threshold of Illusory effects in Hermann Grid, Sinusoidal and Square Gratings and their Possible Implications
Experimental studies have been conducted on the Sinusoidal Grating, Square Grating and Hermann Grid Illusions. Volunteers were presented with a range of input stimuli and asked to report the
Outer plexiform layer receptive fields as underlying factors of the Hermann grid illusion
The Hermann grid was first described and discussed by the physiologist Ludimar Hermann in 1870. It is composed of white horizontal and vertical bars on a black background [1]. Subjects perceive black
Hermann Grid Optical Illusion and The Rebelling Dots of Reality
  • K. Das
  • History
    International Journal of Scientific and Research Publications (IJSRP)
  • 2021
In 1870, Ludimar Hermann reported an optical illusion that has been popularized thereafter after his name. In this Hermann Grid illusion, we see either white grid upon the background of complete
Modelling the Mach Bands Illusion by Means of a Diffusion Model
It is suggested that at the level of conscious processing the perceptual counterpart of absolute luminance, brightness, is available, and it is reasonable to assume that a reconstruction process is carried out by the visual system, which recovers the inner representation that corresponds to the retinal light distribution from the coded relative luminance sketch.
Changing the Chevreul Illusion by a Background Luminance Ramp: Lateral Inhibition Fails at Its Traditional Stronghold - A Psychophysical Refutation
It is suggested that long range interactions between boundary edges and areas enclosed by them, such that diffusion-based models describe, provide a much more plausible account for these brightness phenomena, and local models are insufficient.
The Tilted Hermann Grid Illusion: ‘Illusory Spots’ versus ‘Phantom Bands’
This work transformed straight and curved Hermann grids to rhombic Motokawa grids by gradually tilting the horizontal bars, and shows that two kinds of illusions can coexist in the same grid pattern.
Exploring the Extent in the Visual Field of the Honeycomb and Extinction Illusions
Two cases, known as the Extinction illusion and the Honeycomb illusion, involving small disks and lines, respectively, presented over a large extent of the visual field are studied, finding a dissociation between the two illusions in the dependence on contrast polarity suggesting different mechanisms.
Tiny Squares at the Hermann Grid Corners Can Completely Remove the Illusion
A novel modification of the Hermann grid stimulus is demonstrated and it is shown that introduction of extremely tiny squares at the corners of the grid squares in the classical stimulus can reduce the strength and even completely wipe out the illusory dark spots.
Eggs illusion: Local shape deformation generated by a grid pattern.
A new visual shape illusion is reported, the eggs illusion, in which circular disks located at the midpoints between adjacent grid intersections are perceived as being deformed to ellipses, which suggests a possibility that similar mechanisms underlie the two phenomena.
Spillmann’s weaves are more resilient than Hermann’s grid


The Hermann Grid Illusion Revisited
An alternative theory is proposed according to which the illusory effect is brought about by the manner in which S1 type simple cells in primary visual cortex respond to the grid, which adequately handles many of the facts delineated in this paper.
Global Factors in the Hermann Grid Illusion
The results suggest that a purely local model for the Hermann grid illusion is not a complete explanation, and global factors must be involved.
The Hermann Grid Illusion: A Tool for Studying Human Perceptive Field Organization
The Hermann grid illusion is weakened when the grid is presented diagonally, which suggests a contribution by the orientation-sensitive cells in the lateral geniculate nucleus and visual cortex, and is consistent with the reduction of the center—surround antagonism in retinal receptive fields.
Variations on the Hermann Grid: An Extinction Illusion
When the white disks in a scintillating grid are reduced in size, and outlined in black, they tend to disappear, and the grey alleys seem to be continuous, generating grey crossings that are not actually present.
Feature detection in human vision: a phase-dependent energy model
This paper presents a simple and biologically plausible model of how mammalian visual systems could detect and identify features in an image. We suggest that the points in a waveform that have unique
Neurophysiological and Psychophysical Correlates in Vision Research
The visual laws of simultaneous and successive contrast, of binocular vision, and most principles of colour vision were discovered by analysing visual perception in human subjects by means of psychophysical methods.
Neural dynamics of 1-D and 2-D brightness perception: A unified model of classical and recent phenomena
The simulations indicate how configural image properties trigger interactions among spatially organized contrastive, boundary segmentation, and filling-in processes to generate emergent percepts, providing the first unified mechanistic explanation of 1-D and 2-D brightness phenomena.
Perceived diagonals in grids and lattices
`̀ Indirekte Gro« benbestimmung der rezeptiven Felder der Retina beim
  • 1960