Color psychology reaches beyond emotions into the body itself. In this experiment, participants stare at full screens of blue, red, black, white, green, and yellow for three minutes each, with a 15-minute rest between colors. A portable wrist monitor records blood pressure after each viewing and compares it to each person's resting baseline. Red and yellow screens tend to raise blood pressure. The other colors show little change — a clear sign that colors can alter how people respond physically, not just emotionally.

Colors shape how people think, but that influence has limits. Here, ten participants study flash cards in four colors — red, yellow, blue, and green — viewing each card for 10 seconds before a recall session. The results show no significant difference between any of the colors. Not every color changes how the brain stores and retrieves information.

Color can change how people feel about what they taste. In this experiment, identical batches of lime-flavored soda water are dyed red, orange, and purple, while a fourth batch stays clear. Twenty participants taste all four drinks and write down the flavor they detect. Most match the color to an expected flavor — calling the red drink strawberry, the orange one orange, and the purple one grape. Every drink tastes the same, but color alone is enough to shift perception.

Color psychology extends beyond objects to the color of light itself. Twenty participants are split into two groups: one watches a sad movie scene under blue light, the other under normal white light. Before and after viewing, each person rates their emotional state on a 1 to 3 scale. Comparing those before-and-after ratings shows whether blue light amplifies or dulls the emotional response to the same scene.