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In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
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Related Experiment Video

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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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Staying in bounds: Contextual constraints on object-file coherence.

Stephen R Mitroff1, Jason T Arita, Mathias S Fleck

  • 1Department of Psychology and Neuroscience, Center for Cognitive Neuroscience, Duke University, Durham, NC, USA.

Visual Cognition
|June 6, 2009
PubMed
Summary

Object persistence in visual perception relies on object files, which track entities over time. These files follow rules of boundedness, containment, and contextual sensitivity, demonstrating perception goes beyond mere physical properties.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Computational Neuroscience

Background:

  • Coherent visual perception requires tracking distinct objects as persistent entities over time and motion.
  • Object persistence calculations are automatic and governed by specific rules.
  • The object-file framework models mid-level visual representations that track entities and update object information.

Purpose of the Study:

  • To explore the principles constraining object persistence within the object-file framework.
  • To investigate whether object files are influenced by factors beyond an object's physical properties.

Main Methods:

  • Experimental investigation of object-file formation and its constraints.
  • Analysis of visual perception under varying contextual conditions.
  • Testing the principles of boundedness and containment in object tracking.

Main Results:

  • Object files adhere to the principle of 'boundedness,' requiring a single closed contour for persisting entities.
  • Object files follow the principle of 'containment,' ensuring parts and properties reside within the object.
  • Object files are sensitive to experimental context, influencing entity tracking beyond physical properties.

Conclusions:

  • Object files are constrained by boundedness and containment principles.
  • Contextual factors significantly influence object-file formation and object persistence.
  • Visual object persistence is determined by more than just the physical attributes of an object.