Identification of Televised Symbols as a Function of Symbol Resolution

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Abstract
Two experiments were performed to determine the effect of symbol resolution on speed and accuracy of identification of televised letters and numbers. Ss viewed 36 symbols 10 times under 9 conditions of symbol resolution (3 to 11 scan lines per symbol), and under a solid-symbol (nontelevised) control condition. For most symbols, accuracy of identification seriously deteriorated below 5 lines. Speed performance showed a progressive improvement from 5 to 11 lines but did not reach a level obtained with solid symbols. It was concluded that 11 lines approaches an optimal level of resolution, and that reduction in symbol resolution much below 11 lines should be approached with caution.

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