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P L Emerson

Publications and source records attributed to P L Emerson.

7 recordsLinked to original sources

A generalized visual latency explanation of the Pulfrich phenomenon.

The classical visual latency explanation of the Pulfrich phenomenon is generalized to allow for the possibility that the visual system uses velocity information from motion detectors to compensate for spatial lag due to time lag, in identifying the instantaneous position of a moving object. The results of the reported experiment verify one consequence of the generalized version: the elliptical apparent path is skewed away from the filtered eye. The results suggest also that the extrapolation factor increases with visual latency and that there is a different extrapolation factor for each eye when the eyes are illuminated unequally.

Adult

Filter model for lightness and brightness on different backgrounds.

A filter model is proposed to account for the effects of background luminance on perceived brightness or lightness of a target area. Special attention is focused on a crispening effect describable as a local increase of the rate of change of brightness with target luminance, as target luminance passes through the level of background luminance. The model is based on the assumption of competition, in the form of mutual-shunting-feedback inhibition, between target and surround.

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