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Apparatus for Luminance-Threshold Determination in Animals

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Abstract

A simple apparatus for determining luminance thresholds in animals is described. A General Electric electroluminescent lamp is used as the light source, since its luminance can be varied over many decades electrically while its spectral distribution remains invariant. The luminance of the lamp is varied over a 7-decade range in logarithmic increments by an add–subtract-type stepping switch. Programmed pulses to the stepper increase the luminance; animal responses provide pulses to reduce luminance. A method of calibrating the light source with an Aminco photomultiplier microphotometer is described.

© 1965 Optical Society of America

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