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Some observations on the pedestal effect.

G Bruce Henning1, Felix A Wichmann

  • 1The Sensory Research Unit, Department of Experimental Psychology, Oxford University, Oxford, United Kingdom. bruce.henning@psy.ox.ac.uk

Journal of Vision
|April 28, 2007
PubMed
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The pedestal effect, a boost in detecting gratings with a pedestal, largely vanishes in notched noise. This suggests the effect relies on visual system channels tuned to frequencies other than the signal

Area of Science:

  • Visual perception
  • Auditory and visual psychophysics

Background:

  • The pedestal effect enhances sinusoidal grating detectability when added to a same-frequency, orientation, and phase masking grating.
  • This phenomenon is crucial for understanding visual contrast detection mechanisms.

Purpose of the Study:

  • To investigate the role of spatial frequency channels in the pedestal effect.
  • To determine if the pedestal effect is an intrinsic property of individual visual channels.

Main Methods:

  • Measured the pedestal effect using broadband and notched noise masking.
  • Notched noise had a 1.5-octave band removed, centered on the signal frequency.
  • Also tested with high-pass and low-pass masking noise.

Main Results:

Related Experiment Videos

  • The pedestal effect persisted in broadband and high/low-pass noise.
  • The pedestal effect almost disappeared in notched noise.
  • This indicates a reliance on information from off-frequency channels.

Conclusions:

  • The pedestal effect, without notched noise, primarily uses information from channels with different peak sensitivities.
  • Notched noise prevents 'off-frequency looking,' limiting the use of contrast information from disparate spatial frequencies.
  • The pedestal effect is not characteristic of individual spatial-frequency-tuned channels.