The spatial arrangement of cones in the primate fovea

Article Abstract:

The fovea of Old World primates contain three kinds of cones, each suited to a part of the visible spectrum. Research has shown that the short-wave cones are sparse and arranged in a semi-regular pattern. Direct microspectrophotometric measurement of fovea of talapoin monkeys shows that the middle- and long-wave cones have a locally random array and occur in approximately equal proportions. Since it has been postulated that long-wave cones dominate human fovea, these data suggest that further investigation is necessary. If there is such a species difference, an evolutionary explanation should be sought.

Primates, Photoreceptors, Animal anatomy, Optics, Physiological, Physiological optics

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Colour constancy influenced by contrast adaptation

Article Abstract:

Examination of the dependence of color appearance on both light adaptation and contrast adaptation, using matching task indicates that for naturalistic color signals, color contrast in images can be modified by changes in an illuminant and this modification is sufficient to change the state of contrast adaptation. These observations reveal that contrast adaptation exhibit ability to affect color appearance under different illuminants.

Physiological adaptation, Eye

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The Nagel anomaloscope and seasonal variation of color vision

Article Abstract:

A replication of Manfred Richter's experiment on color vision revealed that his results were affected by the Nagel anomaloscope and not by seasonal variations. Subsequent testing proved that the effects of temperature changes were not on other variables such as the observer, the power supply or the light source. Instead, significant effects were found in the refractive index of the instrument's prism.

Analysis, Testing, Color vision, Color perception tests, Spectroscope, Spectroscopes

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