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Expansion Microscopy: High-Resolution Fluorescent Imaging with a Conventional Microscope
08:53

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Published on: December 19, 2025

Duration expansion at low luminance levels.

Aurelio Bruno1, Inci Ayhan, Alan Johnston

  • 1Cognitive, Perceptual and Brain Sciences, Division of Psychology and Language Sciences, University College London, London, UK. a.bruno@ucl.ac.uk

Journal of Vision
|December 15, 2011
PubMed
Summary
This summary is machine-generated.

Visual perception of time is distorted by luminance levels. Lower light levels lengthen the visual system's temporal response and expand perceived duration, suggesting a link between neural timing and time perception.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Duration distortions and changes in M-neuron temporal tuning occur during saccades and after adaptation.
  • These phenomena suggest a potential link between early visual processing and time perception.

Purpose of the Study:

  • To investigate the relationship between luminance, the temporal impulse response, and perceived duration.
  • To explore how reduced luminance affects time perception in the dark.

Main Methods:

  • Measured apparent motion reversal across decreasing luminance levels to assess temporal impulse response.
  • Measured perceived duration at varying luminance levels (0.75, 3, 50 cd/m²), controlling for apparent contrast and temporal frequency.

Main Results:

  • Decreasing luminance progressively shifted and reduced apparent motion reversal, indicating a lengthened temporal impulse response.
  • Perceived duration was expanded by approximately 60 ms at the lowest luminance (0.75 cd/m²) compared to the highest (50 cd/m²).
  • Perceived temporal frequency remained consistent across luminance levels.

Conclusions:

  • Reduced luminance is associated with both a lengthened temporal impulse response and an expanded perceived duration.
  • These findings support a connection between alterations in early visual system neuronal tuning and the subjective experience of time.