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a collaborative knowledge base characterizing the state of current thought in Cognitive Science.
a test for red-green color deficiencies that consists of a number of colored plates, called Ishihara plates, each of which contain a circle of dots appearing randomized in color and size. Within the pattern are dots which form a number visible to those with normal color vision and invisible, or difficult to see, for those with a red-green color vision defect.

Definition contributed by Anonymous
Phenotypes associated with Ishihara plates for color blindness


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IMPLEMENTATIONS of Ishihara plates for color blindness
No implementations have been added.
EXTERNAL DATASETS for Ishihara plates for color blindness
No implementations have been added.

Experimental conditions are the subsets of an experiment that define the relevant experimental manipulation.


In the Cognitive Atlas, we define a contrast as any function over experimental conditions. The simplest contrast is the indicator value for a specific condition; more complex contrasts include linear or nonlinear functions of the indicator across different experimental conditions.

number of plates read correctly

An indicator is a specific quantitative or qualitative variable that is recorded for analysis. These may include behavioral variables (such as response time, accuracy, or other measures of performance) or physiological variables (including genetics, psychophysiology, or brain imaging data).


Identification of red-green colour deficiency: sensitivity of the Ishihara and American Optical Company (Hard, Rand and Rittler) pseudo-isochromatic plates to identify slight anomalous trichromatism.
Birch J
Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) (Ophthalmic Physiol Opt)
2010 Sep