PubMed · 11528895
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K Kurosawa. 2001. [Radial defects].. https://pubmed.ncbi.nlm.nih.gov/11528895/
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When observers are asked to judge the first position of a moving object, displacements of the judged onset in the direction of and in the direction opposite to the motion have been reported. These errors have been referred to as the Fröhlich illusion and the onset repulsion effect, respectively. To resolve the apparent contradiction between these results, a number of experimental parameters were investigated. Displacement in the direction opposite to motion was only observed when observers pointed to the onset of a slowly moving target. At higher velocities, no displacement with pointing was observed. In contrast, relative judgements of motion onset were accurate at slow velocities, but displaced in the direction of motion at fast velocities. Whether the target moved on a linear or circular trajectory did not alter the results. In one experiment, a dissociation between perceptual and memory-based judgements was found. Overall, the experimental task determined whether displacement in the direction of or in the direction opposite to motion occurred.
During object manipulation, humans select and activate neural action programs acquired during ontogenetic development. A basic issue in understanding the control of dexterous manipulation is to learn how people use sensory information to adapt the output of these neural programs such that the fingertip actions matches the requirements imposed by the physical properties of the manipulated object, e.g., weight (mass), slipperiness, shape, and mass distribution. Although visually based identification processes contribute to predictions of required fingertip actions, the digital tactile sensors provide critical information for the control of fingertip forces. The present account deals with the tactile afferent signals from the digits during manipulation and focuses on some specific issues that the neural controller has to deal with to make use of tactile information.