u/Cypressinn

Red balls" have several distinct, important uses in human brain studies across psychology and neuroscience. They are utilized in a few primary ways:Social Exclusion Studies ("Cyberball"): Researchers use a digital ball-tossing game called Cyberball to study how the brain processes social rejection. During MRI scans, a participant's virtual ball is thrown to other computerized players, who eventually stop throwing the ball back. This exclusion activates the brain's pain and emotion networks.

Infant Psychopathy Studies ("Red Ball Test"): In developmental psychology, a red ball is used alongside human faces to test infants' visual preferences. Eye-tracking studies have shown that babies who prefer looking at the red ball instead of a human face at just five weeks old may be more likely to develop callous-unemotional (psychopathic) traits.

Selective Attention and Blindness: Red balls are classic props in psychological videos used to test inattentional blindness. For example, viewers are told to count the passes of a red ball among a team, which causes them to completely miss an actor in a gorilla suit walking through the scene.

Color Psychology and Brain Imaging: Neuroscientists use stimuli like red and blue balls to measure how the brain encodes and updates visual information, studies which have revealed that different human brains show surprisingly similar neural patterns when processing colors.