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Optimization problems often involve identifying maximum or minimum values under specific constraints. A well-known example is determining the longest horizontal pipe that can be moved around a right-angled corner, where a 3-meter-wide hallway meets a 2-meter-wide hallway. This scenario, common in architectural design and industrial transport, can be understood conceptually through geometric and trigonometric reasoning.To visualize the problem, consider the pipe as a straight line that touches...
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Updated: Apr 20, 2026

Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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Invisible collinear structures impair search.

Hiu Mei Chow1, Chia-huei Tseng2

  • 1Department of Psychology, The University of Hong Kong, Hong Kong.

Consciousness and Cognition
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Summary
This summary is machine-generated.

Conscious awareness is not required for contour integration. Invisible collinear distractors can impair visual search, similar to visible ones, affecting selective attention.

Keywords:
AwarenessCollinearityInvisibleVisual search

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Neuroscience

Background:

  • Visual attention and perceptual grouping are crucial for managing information overload.
  • Attentional search is hindered by collinear distractors overlapping with targets.

Purpose of the Study:

  • To investigate whether conscious awareness of a collinear distractor is necessary for modulating attentional search.
  • To determine if contour integration requires conscious perception.

Main Methods:

  • Experimentally manipulated the visibility of collinear distractors by masking parts of longer distractors.
  • Assessed the impact of visible and invisible collinear distractors on target detection during attentional search.
  • Utilized dichoptic presentation to control perceptual awareness of distractor elements.

Main Results:

  • Visible long collinear distractors (9 elements), but not short ones (3 elements), significantly delayed target detection.
  • Masked long collinear distractors, perceived as short (3 elements) due to conscious awareness manipulation, still impaired search.
  • Invisible collinear distractor parts contributed to contour integration, negatively affecting selective attention.

Conclusions:

  • Conscious awareness is not a prerequisite for contour integration in visual perception.
  • Perceptual grouping and contour formation can occur outside of conscious awareness.
  • Unconscious contour integration can interfere with selective attention and visual search efficiency.