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Another visual illusion involving orientation | JoVE Visualize

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Another visual illusion involving orientation

R Blake, K Holopigian, M Jauch

Vision Research|January 1, 1985

View abstract on PubMed

Summary

Visual noise can distort the perceived orientation of gratings, creating a tilt illusion. This effect is strongest when noise and grating orientations differ by 20-40 degrees, impacting visual perception.

Area of Science:

Visual perception
Neuroscience
Psychophysics

Background:

The perception of orientation can be distorted by visual stimuli.
One-dimensional visual noise can influence the perceived orientation of superimposed gratings.

Purpose of the Study:

To measure the magnitude of the orientation tilt illusion.
To investigate the influence of noise orientation on this illusion.
To explore the role of spatial frequency in the tilt illusion.

Main Methods:

An adjustment procedure was used to quantify the tilt illusion.
The study systematically varied the orientation of one-dimensional visual noise relative to a test grating.
The spatial frequency of both the noise and the test grating was manipulated.

Main Results:

The orientation tilt illusion is maximal when the noise and test grating orientations differ by 20 to 40 degrees.
The magnitude of the illusion depends on the spatial frequency of the test grating.
Visual noise with spatial frequencies several octaves removed from the test grating can still induce illusory tilt.

Conclusions:

The orientation tilt illusion may arise from inhibitory interactions between orientation-selective neurons in the human visual system.
This illusion shares characteristics with other orientation-based visual phenomena, such as the tilt aftereffect and simultaneous tilt illusion.
Understanding these illusions provides insights into the mechanisms of visual processing and neural inhibition.

Materials Engineering

Another Visual Illusion Involving Orientation