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Whole-brain Segmentation and Change-point Analysis of Anatomical Brain MRI—Application in Premanifest Huntington's Disease
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Holistic processing improves change detection but impairs change identification.

Katherine M Mathis1, Todd A Kahan

  • 1Department of Psychology, Bates College, 4 Andrews Road, Lewiston, ME, 04240, USA, kmathis@bates.edu.

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Summary
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Holistic processing aids change detection but hinders identification of visual elements. This Gestalt psychology finding reveals a trade-off in how the brain perceives wholes versus parts.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Gestalt Psychology

Background:

  • Gestalt psychology established principles of holistic visual processing over a century ago.
  • Emerging research suggests holistic perception may obscure details of constituent parts.
  • Understanding this trade-off is crucial for visual search and pattern recognition tasks.

Purpose of the Study:

  • To investigate the impact of holistic processing on change detection and identification accuracy.
  • To examine if perceiving stimuli as a Gestalt whole affects the visibility of its components.
  • To explore the theoretical and applied implications of holistic processing trade-offs.

Main Methods:

  • An experiment involving 62 participants was conducted.
  • Kanizsa rectangle patterns were used, arranged to form either a Gestalt whole or disparate parts.
  • Change detection and change identification accuracy were measured.

Main Results:

  • Holistic processing significantly improved the detection of changes within the stimuli.
  • Conversely, holistic processing impaired the accurate identification of the detected changes.
  • A clear trade-off was observed between detecting and identifying changes under holistic processing conditions.

Conclusions:

  • The findings support the hypothesis that holistic processing comes at a cost to detailed identification.
  • This research has implications for real-world applications such as baggage screening and radiological image analysis.
  • Understanding the balance between holistic and analytic perception is vital for improving visual search systems.