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Related Concept Videos

Anatomical Movements00:51

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Anatomical movements refer to the various actions or motions that can be performed by the body's joints and muscles. These movements are described using specific terms to provide a standardized way of discussing and understanding the range of motion at different joints.
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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
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Movement joints in buildings are essential design elements that accommodate inevitable motions caused by various factors such as temperature changes, moisture content variations, and structural deflections. These motions, if not considered in design and construction, can lead to unsightly or dangerous damage. Movement joints are incorporated in different forms to manage these stresses and allow materials to move without causing distress.
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Related Experiment Video

Updated: Jan 26, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
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Target size modulates saccadic eye movements in humans.

Christoph J Ploner1, Florian Ostendorf, Sandra Dick

  • 1Klinik fur Neurologie, Charité, Berlin, Germany. christoph.ploner@charite.de

Behavioral Neuroscience
|February 26, 2004
PubMed
Summary

This study reveals how the brain transforms large visual targets into eye movements. Larger targets lead to slower, less accurate saccades, suggesting complex sensorimotor processing in the superior colliculus.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Human motor control

Background:

  • Understanding the neural mechanisms of visually guided eye movements is crucial for diagnosing and treating various neurological and ophthalmological conditions.
  • Saccadic eye movements are rapid, ballistic movements that shift the fovea to a new point of interest.
  • The transformation of visual target information into motor commands for saccades involves complex sensorimotor processing, particularly for targets lacking distinct features.

Purpose of the Study:

  • To investigate the sensorimotor transformation mechanisms for spatially extended targets into saccadic eye-movement vectors.
  • To determine how target size influences saccade characteristics, including latency, amplitude, and accuracy.
  • To explore the potential role of the superior colliculus in modulating neuronal activity during saccades to extended targets.

Main Methods:

  • Human subjects performed horizontal saccades to visual targets of varying diameter.
  • Targets were featureless to isolate the effect of target size on saccade generation.
  • Saccade latency, amplitude, and endpoint accuracy were systematically analyzed in relation to target size.

Main Results:

  • Increasing target size decreased the frequency of express saccades and fast regular latency saccades.
  • Conversely, increasing target size increased the frequency of slow regular latency saccades.
  • Saccade amplitude distributions peaked near the target's geometric center, but larger targets resulted in increased amplitude scatter and greater undershoot.

Conclusions:

  • Saccade characteristics change systematically with target size, indicating distinct sensorimotor subprocesses for extended targets.
  • The observed effects suggest that target size modulates neuronal activity, potentially within the superior colliculus, influencing saccade generation.
  • These findings contribute to a deeper understanding of how the brain adapts eye movements to the spatial extent of visual stimuli.