synesthesia is actually mediated through our senses apprehend

But newer studies have shown that synesthesia is actually mediated through our understanding of the shapes, colors and sounds that our senses apprehend.In order for the cross-sensory
experiences to occur,the higher level ideas and concepts
that our minds associate with the sensory input must be activated.For example, this shape can be seen as
either the letter or the number ;and synesthetes associate each with different colors or sounds based on how they interpret it
despite the purely visual stimulus remaining identical.