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Representing multiple object weights: competing priors and sensorimotor memories.

Lee A Baugh1, Amelie Yak1, Roland S Johansson2

  • 1Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada.

Journal of Neurophysiology
|July 8, 2016
PubMed
Summary
This summary is machine-generated.

Individuals rapidly form sensorimotor memories to predict object weight, updating long-term priors with experience. These memory systems adjust independently, though cognitive load can impact learning.

Keywords:
object liftingsensorimotor integrationsensorimotor memoryweight prediction

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Sensorimotor Learning

Background:

  • Humans predict object weight using long-term priors based on properties like size.
  • Atypical size-weight relationships necessitate rapid formation and updating of sensorimotor memories for accurate lifting.
  • Experience gradually refines long-term priors regarding object weight perception.

Purpose of the Study:

  • To investigate the formation and updating mechanisms of sensorimotor memories.
  • To understand how these memories interact with long-term priors.
  • To explore factors influencing the learning and adaptation of lifting forces.

Main Methods:

  • Participants repeatedly lifted objects with normal and inverse size-weight mappings over several days.
  • Lifting forces were measured to assess sensorimotor memory adaptation.
  • The size-weight illusion (SWI) was used to evaluate changes in long-term priors.

Main Results:

  • Adaptation of the SWI showed interference, indicating non-independent adjustment of priors.
  • Half of the participants demonstrated rapid learning of appropriate lifting forces; others showed reduced learning.
  • Concurrent visuomotor tasks impaired lifting force scaling, suggesting cognitive resource involvement in sensorimotor memory formation.

Conclusions:

  • Sensorimotor memory and long-term priors adjust independently.
  • Cognitive resources are involved in mapping object identity to weight for sensorimotor memory formation.
  • Individual differences may influence sensorimotor memory abilities and learning rates.