Visual Field Factors in the Perception of Direction

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Abstract
A simple reference pattern was presented in an otherwise completely homogeneous visual field, bounded by a framework in indirect vision. The basic reference pattern[long dash]a tilted straight line[long dash]determined a direction which the observer indicated by moving a dot so as to locate it along the perceived extension of the line. The two principle variables were the length of the reference line and distance of the dot from the end of the line. Precision of localization of the dot decreases linearly with increase in distance, and decreases in a more complicated fashion with decrease in length of line. A constant error was found which improved with practice. Aside from limitations of retinal acuity, the determinants of precision and CE in the situations are independent of the peripheral factor of eye movements and appear to be central in nature.

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