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===Lateral inhibition===
Also spatial processing takes place right in the periphery of the compound eye, in the lamina. There a process called lateral inhibition creates spatial anagonism (similarly as in the vertebrate retina; Laughlin, 1987). The cellular basis of lateral inhibition may be a combination of direct synaptic feedbacks from the lamina to the photoreceptors, but also in the poorly investigated extracellular potentials combined with the regulation of the glial permeability or currents. The lateral inhibition is able to attenuate signals at any pixel (one ommatidium) that are probable, i.e. possible to predict on the basis of the neighbouring pixels. The spatial information processing may thus fullfil the requirements of predictive coding (Srinivasan et al.,1982)