Effects of target size and eccentricity on visual detection and resolution

Abstract Detection and resolution threshold sensitivity profiles were determined for five target sizes along the horizontal meridian of the central 60° visual field (30° nasal and temporal), utilizing the Tu¨bingen perimeter. In general, increases in stimulus eccentricity and/or decreases in target size produced a decrement in both detection and resolution sensitivities. Magnitude of this effect was much more pronounced for resolution than detection, and the two functions appear to reflect relatively distinct, separate response characteristics. A possible physiological basis underlying the differences between detection and resolution properties is described.

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