Hanggi EB, Ingersoll JF, Waggoner TL. 2007. Color vision in horses (Equus caballus): deficiencies identified using a pseudoisochromatic plate test. J Comp Psychol. 2007 Feb;121(1):65-72.

 
  • 下面的研究表明,马所能辨别的颜色与人类红绿色盲所看到的颜色一样。
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