• Surprise

• the emotion of yellow — orienting response to sudden change
• Wavelength: 570-590 nm
• evolutionary origin:: bright sunlight, alerting flowers, warning insects — sudden environmental shifts
• yellow’s high luminance grabs attention. the first emotion before assessment: is this threat or opportunity?

• in prism

  • signals attention needed, new event, unexpected state change
  • a notification in surprise state: something just happened, look here, orient yourself