Chromatic adaptation from achromatic stimuli with implied color

Area of Science:

• Visual Perception
• Cognitive Neuroscience
• Color Science

Background:

• Memory color influences object perception even in achromatic images.
• Top-down knowledge of object color may affect visual processing.
• Previous studies explored memory color effects in achromatic stimuli.

Purpose of the Study:

• To investigate if implied color in grayscale images biases perception of subsequent stimuli.
• To differentiate between implied color adaptation and color constancy explanations.
• To quantify perceptual bias using a precise psychophysical method.

Main Methods:

• Employed a top-up adaptation technique with a roving-pedestal, two-alternative spatial forced-choice method.
• Used achromatic images of natural objects with diagnostic colors as adaptors.
• Compared effects of object images against phase-scrambled control images.

Main Results:

• Achromatic images of objects with implied color induced a perceptual bias.
• This bias shifted the perceived achromatic point towards the object's typical color.
• The effect was particularly pronounced for banana images.
• Results were inconsistent with a color constancy explanation.

Conclusions:

• Implied color adaptation occurs in chromatic signaling mechanisms influenced by object knowledge.
• Top-down cognitive factors play a role in modulating visual perception.
• Memory color effects can be demonstrated using achromatic stimuli and adaptation paradigms.