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The limitations are of several natures: cognitive once the signal has arrived in the brain, but also physical within the eye e.g. for vision. For vision, the crucial bit is to transform changes of incoming light into an electrical signal. It is not completely elucidated. Recent research shows e.g. that for some flies, there may be a mechanical intermediate ...


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Flicker Fusion Threshold: The wikipedia definition: It is defined as the frequency at which an intermittent light stimulus appears to be completely steady to the average human observer. Background In 1824, Peter Mark Roget (who also wrote the famous Thesaurus) first presented the concept of "persistence of vision" to the Royal Society of London, as ...


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It may be because, when we move our shoulders towards our the body, also know as abduction (Fig 1.) gives the central part of the body an elevation. when we rotate our arms more upwards (Adduction), the elevation will be lost. So in other words, when we are making snow angels, Start Normal position (hands near thighs) = Back and shoulders on ground ...



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