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Area of Science:

  • Visual perception
  • Human contrast processing

Background:

  • Previous research on the straddle effect used spatially second-order visual patterns.
  • The straddle effect is a performance drop when test contrasts straddle the adaptation contrast.

Purpose of the Study:

  • To determine if spatially first-order patterns are sufficient to elicit the straddle effect.
  • To investigate contrast normalization with first-order patterns.
  • To compare performance between first- and second-order tasks.

Main Methods:

  • Demonstrated the straddle effect using spatially first-order visual patterns.
  • Employed several different observer tasks.
  • Observed contrast normalization effects analogous to second-order patterns.

Main Results:

  • The straddle effect was successfully demonstrated using first-order visual patterns.
  • Contrast normalization effects were observed with first-order patterns.
  • Performance in first-order tasks was slightly lower than in second-order tasks, possibly due to memory load.

Conclusions:

  • Spatially second-order patterns are not necessary for the straddle effect.
  • Human contrast processing may involve a comparison to recent average contrast, not just monotonic physical contrast.
  • The straddle effect is a robust phenomenon observable across different visual pattern types.