fixation span can be stretched through training (meta guiding) to take in as much as a line for the purpose of skimming or speed reading. However other sources suggest that using this method can result in a severely reduced comprehension rate in comparison to normal reading ("rauding"). Some speed reading courses stress that the human eye has to move very quickly. They also stress that the human eye should move in a pattern to fill in the information that was not properly perceived. The effective limit for scanning speeds based upon the limit of the human eye's resolution is about 300 words per minute. It is claimed that such speeds also require great practice, and extremely rapid eye movements, although research suggests that such training is not possible. It has been suggested by some speed reading promoters that the readers who achieve such speeds are on the autism spectrum. Research into reading rate suggests that study strategies, rather than speed reading, explains why expert readers, such as professors and editors, are more efficient than others. Application to face processing Face recognition system requires several fixation on different location (typically in a triangular pattern) for a face to be recognised. The same is true for the so-called Super Recognisers who are persons with high face recognition capabilities. Similarly to the reading span, the Facespan might be modulated by difficulty, expertise, age, disorder and other idiosyncratic differences between individuals. The idiosyncratic differences are thus most probably due to differences in Facespan rather than in oculomotor strategy. Previous study revealed that the Vision span is more accurately defined in number of characters rather than in visual angle. References Further reading McConkie and Hogaoam 1985. Eye position and word identification during reading. In R. Groner et al.'s Eye movements and information processing. Amsterdam, Elsevier. Just and Carpenter 1987. In Allyn & Bacon's The Psychology of Reading and Language Comprehension. Boston. See also PhotoReading Vision Reading (process) Educational psychology