Fuzzy modelling of relations between physical weight and perceived heaviness: the effect of size-weight illusion in industrial lifting tasks

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Abstract
In four experiments with 224 subjects the relationships between physical weight, subjective heaviness, and size of load (container) were investigated. The results were described with the help of fuzzy sets and processed further in a way, that the so called size-weight illusion—known from basic psychophysical research— could be determined for ranges of load relevant for industrial lifting tasks. From a quantitative analysis of the size-weight illusion by fuzzy sets we derived, that estimations of tolerable weights are influenced considerably by this effect. Some contradictory results from literature referring to lifting tasks with loads of different forms/sizes could be explained by antinome effects of the size-weight illusion and biomechanics.