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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
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Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...

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Related Experiment Video

Updated: May 7, 2026

Efficiently Recording the Eye-Hand Coordination to Incoordination Spectrum
07:30

Efficiently Recording the Eye-Hand Coordination to Incoordination Spectrum

Published on: March 21, 2019

Subjective difficulty of movements with ongoing visual control.

Alan H S Chan1, Errol R Hoffmann

  • 1a Department of Systems Engineering and Engineering Management , City University of Hong Kong , Kowloon Tong.

Journal of Motor Behavior
|October 2, 2013
PubMed
Summary
This summary is machine-generated.

Participants could accurately gauge the difficulty of single-component movements. For complex, multi-component movements, subjective difficulty ratings correlated with objective measures, though less directly.

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Area of Science:

  • Human motor control
  • Perceptual psychology
  • Human-computer interaction

Background:

  • Fitts's Index of Difficulty (ID) objectively measures single-component movement difficulty.
  • Assessing difficulty for multi-component movements is complex due to interacting factors.
  • Objective measures for complex tasks may require indirect approaches.

Purpose of the Study:

  • To investigate if subjective difficulty ratings are valid for visually controlled movements.
  • To determine the relationship between subjective and objective measures of movement difficulty.
  • To explore differences in this relationship for single- versus multi-component movements.

Main Methods:

  • Participants performed visually controlled movements of varying objective difficulty.
  • Subjective difficulty ratings were collected after each movement.
  • Objective difficulty was calculated using Fitts's Law principles.
  • Analysis focused on the correlation between subjective and objective difficulty measures.

Main Results:

  • A strong correlation was found between subjective and objective difficulty for single-component movements.
  • For two-component movements, subjective difficulty related to objective difficulty, but with reduced precision.
  • The findings suggest subjective perception aligns with objective difficulty, especially in simpler tasks.

Conclusions:

  • Subjective difficulty is a valid measure for visually controlled movements, particularly for single components.
  • The relationship between subjective and objective difficulty is less direct for complex, multi-component movements.
  • This research informs the design of tasks and interfaces by considering perceptual difficulty.