In this view, synesthesia is the collective chatter of sensory neighbors once confined to isolation.The cause remains a mystery, however.Colors in Carey's world have properties that most of us would never dream of: red is solid, powerful and consistent, while yellow is pliable, brilliant and intense. (Synesthesia) - YouTube 'At present, we do not have the technology to observe brain-connection changes in the living human brain and how these relate to mental changes,' Laeng said in an email interview.Smilek and colleagues have identified two groups of synesthetes among those who associate letters and numbers with colors, he explained in a telephone interview.
