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On the response function and range dependence of manual estimation.

Karl K Kopiske1,2, Fulvio Domini3,4

  • 1Center for Neuroscience and Cognitive Systems@UniTn, Istituto Italiano di Tecnologia (IIT), Corso Bettini, 31, 38068, Rovereto, TN, Italy. karl.kopiske@physik.tu-chemnitz.de.

Experimental Brain Research
|March 5, 2018
PubMed
Summary

Manual size estimation scales linearly with object size up to 90mm. The inverse visual estimation task showed a shallower slope, suggesting distinct cross-modal matching properties. Scalar variability was mixed.

Keywords:
Finger spanManual estimationSensory magnitudeSensory matchingVision

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Area of Science:

  • Psychology
  • Neuroscience
  • Human Perception

Background:

  • Manual size estimation is theorized as cross-modal matching between stimulus size and finger opening.
  • Limited research systematically investigates manual estimates across diverse stimulus ranges.

Purpose of the Study:

  • Map response properties of manual estimates for visual stimuli.
  • Map response properties of visual estimates for proprioceptive stimuli.
  • Investigate stimulus range dependency and scalar variability in manual estimates.

Main Methods:

  • Two experiments with 18 and 14 participants respectively.
  • Assessed manual estimates of visually presented stimuli.
  • Assessed visual estimates of proprioceptive stimuli.

Main Results:

  • Manual estimates showed linear scaling (slope ~1) up to 90mm, limited by hand size.
  • Inverse visual estimation task yielded a shallower slope (~0.7).
  • Scalar variability results were mixed; some plateau indication, no mechanical constraint evidence.

Conclusions:

  • Manual size estimation exhibits linear scaling within physical limits.
  • Cross-modal matching properties differ between direct manual and inverse visual estimation.
  • Further research needed on scalar variability and mechanical constraints in larger ranges.