Chromatic collinear facilitation, further evidence for chromatic form perception

Tal Ellenbogen, Uri Polat*, Hedva Spitzer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Collinear facilitation of contrast detection of achromatic stimuli has been studied over the past decade by different groups. We measured collinear facilitation of chromatic contrast detection under equal-luminance (photometric quantity) and under isoluminance (minimum motion technique) conditions, as two different controls. The facilitation was tested for chromatic contrast detection of a foveal Gabor signal flanked by two high chromatic-contrast Gabor signals. The results indicated a significant facilitation in the presence of spatial adjacent collinear chromatic contrast signals, when the flankers were located at a short distance, across all observers for three chromatic channels. The facilitation was compared to a non-collinear flanker configuration. The results indicated no facilitation effect at the opposing phase configuration, at a short flanker distance, whereas a small facilitation was observed with a configuration at a longer flanker distance. The findings suggest that the performance and specificity of chromatic collinear facilitation is not impaired with regard to achromatic mechanisms.

Original languageEnglish
Pages (from-to)547-568
Number of pages22
JournalSpatial Vision
Issue number6
StatePublished - 2006


  • Collinear
  • Color vision
  • Contrast
  • Isoluminance
  • Lateral facilitation
  • Visual cortex


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