The time course of contrast adaptation measured with a new method: Detection of ramped contrast

Xue Dong, Stephen A. Engel, Min Bao

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

The present study introduces a new method to measure contrast detection thresholds before and after adaptation to contrast. A sinusoidal testing grating increased contrast at a constant rate from an initial subthreshold level. Subjects indicated when the grating was just visible, which terminated its presentation. The stimulus contrast at the time of response was taken as a measure of relative threshold. We used the method to measure the time courses of changes in threshold following adaptation, for several adapting contrasts (9, 19, 29, or 39 dB, ref. 1%) and adapting durations (10, 100, or 1000 s). The buildup and decay of adaptation to contrast was described well by a power function of time. These results agree with previous findings, but are more efficient in terms of subject time. This method promises to be a useful tool for studying the dynamics of adaptation to spatial contrast.

Original languageEnglish (US)
Pages (from-to)427-437
Number of pages11
JournalPerception
Volume43
Issue number5
DOIs
StatePublished - 2014

Keywords

  • Contrast adaptation
  • Ramp detection

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