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  • Radial and tangential movem...
    Day, R. H.; Wong, T. S.

    Journal of experimental psychology, 01/1971, Volume: 87, Issue: 1
    Journal Article

    Describes 2 experiments, with 14 volunteer Ss in each, on the difference in haptically judged extent of 2 raised edges forming an L. Data from Exp. I show that when movements of the outstretched arm and finger along both components of the L are tangential, there is no difference in their apparent lengths, but that when movement along 1 is tangential and the other radial, the latter is apparently longer. In Exp. II a different type of movement involving different joints was required, but results are essentially the same. Data from both experiments confirm earlier findings on the relative apparent extents of tangential and radial movement and are interpreted as demonstrating the absence of a relationship between visual and haptic illusions of length in an L figure.