4.10 Opponent Process Theory in Color Perception

A set of flashcards summarizing the main concepts of opponent process theory and its role in color perception.

What are the three color channels provided to the brain by ganglion cells according to opponent process theory?

The red-green channel, the yellow-blue channel, and the white-black channel.

How does the opponent process theory differ from the trichromatic theory in explaining color perception?

Opponent process theory explains color vision at the level of the ganglion cells, while trichromatic theory explains it at the level of photoreceptors (cones).

What phenomenon can be observed as evidence for opponent process theory after staring at a color for an extended period?

Negative afterimages.

What happens to a ganglion cell when exposed to its inhibitory color according to opponent process theory?

The firing rate of action potentials decreases.

In the context of color blindness, why can individuals with red-green color blindness still see yellow?

Opponent process theory explains that even if a cone type is missing, the remaining cone type can still generate enough excitation to signal yellow.

What do ganglion cells do in relation to incoming signals from cones?

They provide an additional layer of organization and analysis by combining and processing signals from different cone types.

How does opponent process theory enhance our ability to discriminate colors?

It exaggerates the differences between similar shades, allowing for better discrimination.

What visual processing challenge do mantis shrimps face despite having many cone types?

They are less effective at differentiating similar shades of colors without the additional processing from opponent neurons.