A PASSIVE PERCEPTUAL LEARNING TASK FOR PRIMAL COLOR MODIFIES DIFFERENCE THRESHOLD OF MIDDLE TONE COLORS

  • Yasuhiro Kawabata
  • Rintaro Nishikawa
  • Miho Kawabata

Abstract

Observers performed a memory task in which they learned the location of a target color in a 4 * 4 colored matrix. Each of the 16 squares within a matrix was assigned one of four unique hues (red, yellow, green and blue), and observers were asked to report the location of a target hue. The initial frame rate was 2 matrices per second and it was increased as observers’ performance improved to as high as 25 matrices per second. Observers performed the color hue discrimination task before and after the memory task. Attending to a particular target color influenced discrimination of middle tone colors which contained the primal color. For example, reddish target color sensitized the hue discrimination of orange-yellow, orange, red, reddish-purple and bluish-purple.

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