Counterphase lightness induction
Related Experiment Video
Updated: Aug 7, 2026

State-Dependency Effects on TMS: A Look at Motive Phosphene Behavior
Published on: December 28, 2010
Abstract:
When half-cycle wide mid-grey test elements are superimposed on a black and white square wave induction grating, their apparent lightness is a linear function of their phase relationship with the induction grating; being judged lightest when in phase with the black bars of the grating, and darkest when in phase with the white bars. This finding justifies the use of the term "counterphase induction" to describe the effect, and emphasizes the similarity between this effect and McCourt's (1982) [Vision Res. 22, 119-134] grating induction effect. The fact that the same linear function holds whether the test elements are square or rectangular favours a global over a local explanation.
More Related Videos
Related Concept Videos
Light Acquisition
Interference and Diffraction
Phase Contrast and Differential Interference Contrast Microscopy
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Charging Conductors By Induction
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
Induced Electric Dipoles
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Induction
A...

