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The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
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Related Experiment Video

Updated: Apr 25, 2026

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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Averaging, not internal noise, limits the development of coherent motion processing.

Catherine Manning1, Steven C Dakin2, Marc S Tibber3

  • 1Centre for Research in Autism and Education (CRAE), Institute of Education, University of London, 55-59 Gordon Square, Institute of Education, London WC1H 0NU, UK.

Developmental Cognitive Neuroscience
|August 28, 2014
PubMed
Summary

Children

Keywords:
Direction discriminationMotion processingVisual development

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Area of Science:

  • Visual perception
  • Developmental neuroscience
  • Cognitive psychology

Background:

  • Global motion processing is crucial for navigating dynamic environments.
  • This ability develops late in childhood, with adult-like function emerging by mid-to-late childhood.
  • The precise reasons for this delayed development remain unclear.

Purpose of the Study:

  • To investigate whether internal noise or global pooling limits motion coherence sensitivity development.
  • To differentiate the contributions of internal noise and averaging to age-related improvements.
  • To identify the primary limiting factors in the development of coherent motion perception.

Main Methods:

  • Presented equivalent noise direction discrimination and motion coherence tasks to children (5, 7, 9, 11 years) and adults.
  • Tested performance at both slow (1.5°/s) and fast (6°/s) motion speeds.
  • Utilized regression analyses to link performance improvements to specific mechanisms.

Main Results:

  • Internal noise decreased, and averaging ability improved with age in children.
  • Age-related gains in coherent motion perception were solely driven by improved averaging.
  • Reductions in internal noise did not significantly contribute to enhanced perception.

Conclusions:

  • Developmental improvements in coherent motion sensitivity are primarily limited by enhanced averaging of motion signals.
  • Brain regions responsible for integrating motion signals (e.g., MT/V5) are key sites of developmental change.
  • Understanding these developmental trajectories informs visual neuroscience and child development research.