How does Poggendorff illusion work?

The Poggendorff Illusion is one among a number of illusions where a central aspect of a simple line image – e.g. the length, straightness, or parallelism of lines – appears distorted by other aspects of the image – e.g. other background/foreground lines, or other intersecting shapes.

Who discovered the Poggendorff illusion?

It is named after Johann Christian Poggendorff, the editor of the journal, who discovered it in the figures Johann Karl Friedrich Zöllner submitted when first reporting on what is now known as the Zöllner illusion, in 1860.

How does the Zollner illusion work?

Zollner illusion. The horizontal lines are parallel but appear to tilt alternately, i.e., the acute angles formed by the horizontal lines and the short inducing lines appear to expand. It is said that the illusion is maximum when the intersecting angle is 10 – 30 deg. The oblique arrangement increases illusion.

How does the Jastrow illusion work?

The Jastrow illusion is a size illusion where two curved shapes of identical measurements are placed next to each other. When viewing the two shapes, one looks significantly larger than the other. When the positions of the two shapes are reversed, the impression of which is the larger is also reversed.

How is the Poggendorff illusion an optical illusion?

Instead there is an apparent position shift of the lower portion of the line. The Poggendorff illusion is a geometrical-optical illusion that involves the misperception of the position of one segment of a transverse line that has been interrupted by the contour of an intervening structure.

What are the effects of the Ponzo illusion?

Ponzo illusion. Another is the ” framing-effects hypothesis “, which says that the difference in the separation or gap of the horizontal lines from the framing converging lines may determine, or at least contribute to the magnitude of the distortion.

How can I do the Poggendorff experiment on my computer?

You can do this three ways: press the up and down buttons to the right of the Poggendorf stimulus. press the up and down arrow keys on your keyboard. click and/or drag your mouse over the right edge of the bar moving and/or dragging the right hand line along with your mouse pointer.

Who was the scientist who discovered the Zollner illusion?

He discoverd it the drawings of Johann Karl Friedrich Zöllner (1834 – 1882), a German astrophysicist with a keen interest in optical illusions. Poggendorff was editor of the journal to which Zöllner submitted drawings in support of his paper reporting what is now known as the Zöllner Illusion.