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Related Experiment Video

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Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
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Cross-modal interactions between olfaction and vision when grasping.

Umberto Castiello1, Gesualdo M Zucco, Valentina Parma

  • 1Department of General Psychology, University of Padua, Via Venezia 8, 35131 Padua, Italy. umberto.castiello@unipd.it

Chemical Senses
|June 24, 2006
PubMed
Summary

Vision and smell interact during grasping. Smelling a larger object before grasping a small one altered hand movements, showing cross-modal integration in goal-directed actions.

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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Human Motor Control

Background:

  • The integration of sensory information is crucial for effective goal-directed actions.
  • Cross-modal interactions between vision and olfaction are known but less understood in motor control.

Purpose of the Study:

  • To investigate the influence of olfactory cues on visually guided grasping movements.
  • To explore the cross-modal integration between olfaction and vision in the context of motor planning and execution.

Main Methods:

  • Kinematic analysis of hand and finger movements during object grasping.
  • Participants were presented with olfactory stimuli (odorants) and visual targets of varying sizes.
  • Comparison of grasping parameters (e.g., hand aperture, movement time) under different sensory conditions.

Main Results:

  • Olfactory cues significantly modulated grasping kinematics.
  • When grasping small objects, larger evoked object sizes led to later and greater maximum hand aperture.
  • When grasping large objects, smaller evoked object sizes led to earlier and reduced maximum hand aperture.

Conclusions:

  • Olfaction influences visually guided grasping, demonstrating cross-modal integration.
  • These findings extend the understanding of sensory integration to complex goal-directed motor actions.
  • The study provides evidence for the interplay between smell and vision in action planning.