Abstract
Knowledge of the difficulties involved in processing deformable objects is necessary if learning activities are to be devised which develop visualisation skills in spatial aspects of mathematics. The research reported here attempts to determine an ordering in terms of complexity of tasks involving the mental manipulation of deformable objects, tasks which require the same skills as those employed in mathematical imagery.
Subjects performed a series of spatial tests involving the comparison of diagrams of interlaced ropes, or knots at varying orientations. Knots were chosen not only because there is a mathematical structure to describe their properties but also, since they are deformable, the tasks differ from those in earlier work based upon the rotation of rigid objects.
Results indicated that certain knot shapes are processed faster than others and, as with rigid objects, greater relative rotation of one of the deformable shapes increases the decision time. Tasks with more crossings were predicted to be of higher complexity, and to require longer decision times. However, this was found not to be the case, particularly where strong bilateral symmetry existed which significantly reduced decision time.
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McLeay, H., Piggins, D. The mental manipulation of 2-D representations of knots as deformable structures. Educ Stud Math 30, 399–414 (1996). https://doi.org/10.1007/BF00570831
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DOI: https://doi.org/10.1007/BF00570831