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Related Experiment Videos

Human temporal impulse response speeds up with increased stimulus contrast.

C F Stromeyer1, P Martini

  • 1Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA. charles@stokes.harvard.edu

Vision Research
|January 22, 2003
PubMed
Summary

Visual responses speed up with increased stimulus contrast, similar to how they speed up with higher luminance. This study demonstrates this effect psychophysically, showing faster temporal responses in human vision.

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Area of Science:

  • Visual neuroscience
  • Human psychophysics
  • Retinal processing

Background:

  • Increasing mean luminance accelerates visual responses and makes the temporal impulse response function (IRF) more transient.
  • Physiologically, elevated stimulus contrast at constant mean luminance also advances temporal response phase and increases transience (bandpass).
  • Magnocellular (MC) retinal ganglion cells exhibit temporal contrast gain control, unlike parvocellular (PC) cells.

Purpose of the Study:

  • To psychophysically investigate if human visual temporal responses speed up with increasing stimulus contrast.
  • To determine if this effect mimics the temporal contrast gain control observed in MC retinal cells.
  • To model the observed changes in temporal response with contrast.

Main Methods:

Related Experiment Videos

  • Presented low spatial-frequency gratings at suprathreshold contrast in pairs of pulses with brief delays.
  • Utilized a motion task (direction discrimination) and a flicker task (agitation discrimination).
  • Analyzed psychophysical responses to varying stimulus contrast levels.

    • Main Results:

    • Human visual temporal responses showed increased transience with rising stimulus contrast in both motion and flicker discrimination tasks.
    • These psychophysical findings parallel the physiological temporal contrast gain control observed in retinal ganglion cells.
    • The observed speeding up of responses was successfully modeled by a nonlinearity where the IRF shortens as contrast increases.

    Conclusions:

    • Human visual temporal processing exhibits contrast-dependent speeding up, analogous to luminance effects.
    • This psychophysical evidence supports the existence of temporal contrast gain control in human vision.
    • A contrast-dependent shortening of the temporal impulse response function underlies these observed perceptual changes.