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Selective interference of hand posture with grasping capability estimation.

Laurie Geers1, Gilles Vannuscorps2,3, Mauro Pesenti2,3

  • 1Psychological Sciences Research Institute, Université catholique de Louvain, 1348, Louvain-la-Neuve, Belgium. laurie.geers@uclouvain.be.

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Sensorimotor input influences action judgments. Squeezing a ball with fingers (precision grip) reduced perceived grasping ability, suggesting hand representation changes, not just response bias.

Keywords:
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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Motor Control

Background:

  • Body posture and sensorimotor input affect action performance judgments.
  • Grip aperture influences judgments of grasping capability.
  • Potential mechanisms include altered hand representations or response congruency effects.

Purpose of the Study:

  • To investigate the role of sensorimotor input in prospective action judgments.
  • To differentiate between sensorimotor effects and response congruency effects on graspability judgments.

Main Methods:

  • Participants estimated grasping capability while performing secondary tasks: squeezing a ball with a precision grip or palm grip.
  • Experiment 1: Assessed graspability judgments and size-contrast illusions (Ebbinghaus).
  • Experiment 2: Examined effects on numerical magnitude judgments.

Main Results:

  • Precision grip task led to underestimated graspability, influenced by object size (Ebbinghaus illusion).
  • Palm grip task showed incongruency effects on numerical judgments, but not graspability.
  • Grip reduction in the precision grip task affected graspability estimates.

Conclusions:

  • Sensorimotor input modifies hand representation, impacting perceived graspability independently of response congruency.
  • Findings suggest distinct neural pathways for sensorimotor feedback in action judgments versus numerical tasks.