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Hyperacuity
Hering has done seminal work on what we now call hyperacuity, i.e., a spatial resolution in certain visual tasks that exceeds visual acuity by about an order of magnitude. In his famous 1899 treatise "On the Limits of Visual Acuity" he summarizes empirical data published 1863 by Alfred Wilhelm Volkmann and points out that the resulting spatial resolution goes well below the size of receptor cells in the central retina. In an explanatory model, Hering superimposes a Vernier acuity stimulus – i.e. a disalignment among two line segments – onto an idealized receptor array. He argued that, by a mechanism of integration across small eye movements, the location information signalled by the involved receptors is coded to a much higher precision than would be possible by a single receptor, an explanation that is still holds up today.

Add reference to Volkmann: