Synesthesia

1. Synesthesia: is a neurologically-based condition in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People who report such experiences are known as synesthetes.

http://en.wikipedia.org/wiki/Synesthesia

2. grapheme-color synesthesia: is a form of synesthesia in which an individual's perception of numbers and letters is associated with the experience of colors.

http://en.wikipedia.org/wiki/Grapheme–color_synesthesia

3. ordinal-linguistic personification :  is a form of synesthesia in which ordered sequences, such as ordinal numbers, days, months and letters are associated with personalities

http://en.wikipedia.org/wiki/Ordinal_linguistic_personification

4. number-form synesthesia: is a mental map of numbers, which automatically and involuntarily appears whenever someone who experiences number-forms thinks of numbers.

http://en.wikipedia.org/wiki/Synesthesia#Number_form_synesthesia

5. sound-color synesthesia: is "something like fireworks": voice, music, and assorted environmental sounds such as clattering dishes or dog barks trigger color and simple shapes that arise, move around, and then fade when the sound stimulus ends.

http://en.wikipedia.org/wiki/Synesthesia#Sound_.E2.86.92_color_synesthesia

6. lexical-gustatory synesthesia: s one of the rarer forms of synesthesia, in which spoken or written words evoke vivid sensations of taste, sometimes including temperature and texture.

http://en.wikipedia.org/wiki/Lexical-gustatory_synesthesia

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