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Related Experiment Video

Updated: May 23, 2026

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
09:41

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

Published on: April 21, 2023

Hand shaping using hapsis resembles visually guided hand shaping.

Jenni M Karl1, Lori-Ann R Sacrey, Jon B Doan

  • 1Department of Neuroscience, Canadian Centre for Behavioural Neuroscience, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada. jenni.karl@uleth.ca

Experimental Brain Research
|March 23, 2012
PubMed
Summary

When reaching without sight, the hand first makes contact to identify the object. Then, adjustments are made for a precise grasp, similar to visually guided movements.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human motor control

Background:

  • Reach-to-grasp movements involve hand transport, shaping, and grasping.
  • These elements are guided by vision, haptic input, or memory.
  • The process of reach-to-grasp without prior visual information is not fully understood.

Purpose of the Study:

  • To investigate how reach-to-grasp movements are executed when all target information must be acquired through touch.
  • To compare haptically guided grasping with visually guided grasping.

Main Methods:

  • Participants reached for randomly presented food items of varying sizes (orange slice, donut ball, blueberry) under unsighted conditions.
  • The goal was to place the item in the mouth, constraining the grasp.
  • Hand transport, shaping, and grasping were analyzed using frame-by-frame video and linear kinematics.

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Design, Fabrication, and Administration of the Hand Active Sensation Test (HASTe)
07:54

Design, Fabrication, and Administration of the Hand Active Sensation Test (HASTe)

Published on: September 8, 2015

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
10:51

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Published on: January 15, 2018

Related Experiment Videos

Last Updated: May 23, 2026

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
09:41

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

Published on: April 21, 2023

Design, Fabrication, and Administration of the Hand Active Sensation Test (HASTe)
07:54

Design, Fabrication, and Administration of the Hand Active Sensation Test (HASTe)

Published on: September 8, 2015

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
10:51

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Published on: January 15, 2018

Main Results:

  • In unsighted reaching, initial hand transport established haptic contact for target identification.
  • Following haptic identification, hand and digit trajectories, shaping, and reorientation were adjusted for grasping.
  • Haptically guided grasping showed significant similarity to visually guided grasping.

Conclusions:

  • The hand uses initial contact for object identification in unsighted reaches.
  • Motor control strategies for haptically and visually guided grasping are remarkably similar.
  • Findings offer insights into the neural mechanisms underlying hand use and sensorimotor control.